JPH06318107A - Programmable controller, and resetting method for specific other station, resetting factor detecting method for other station, abnormal station monitoring method, synchronism detecting method, and synchronization stopping method of decentralized control system using programmable controller - Google Patents

Abstract

PURPOSE:To improve the operation efficiency by making possible restoring operation without going to the place where a local station which enters a down state owing to abnormality is installed. CONSTITUTION:A power source part 10 has an abnormality detecting circuit 12 which detects abnormality of a power source and outputs a power source reset signal 14 and a CPU control part 100 has a reset switch 106 which outputs a forcible reset signal 118 for forcibly resetting a device. A data link control part 200 has a data link I/F part 204 which makes a communication with other stations, a reset signal generating circuit 206 which resets the CPU control part 100 and an I/O unit part 300, and a reset circuit part 205 which resets the data link control part 200 and the reset circuit part 205 outputs the reset signal on the basis of the power source reset signal 14 and forcible reset signal 118.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a programmable controller having a data link function in a distributed control system for distributedly controlling a plurality of programmable controllers, a method of resetting a specific other station in a distributed control system using the same, and a method of resetting other stations. The present invention relates to a reset factor detection method, an abnormal station monitoring method, a synchronization start method, and a synchronization stop method.

[0002]

2. Description of the Related Art A conventional programmable controller of this type is shown in FIG. In FIG. 14, reference numeral 10 denotes a power supply unit, which includes a constant voltage circuit 11 and an abnormality detection circuit 12. 13 is a constant voltage circuit 11
Is a voltage of, for example, 5 V, and 14 is an abnormality detection signal output from the abnormality detection circuit 12.

Reference numeral 100 is a CP that executes sequence processing and the like.
A U control unit 101 is a CPU in the CPU control unit 100, 102 is a ROM in which an operating system program is stored, 103 is a RAM for temporarily storing data and the like, and 104 is a user program for executing sequence control. User memory stored, 1
Reference numeral 05 is a data RAM that stores device information used in the user program, 106 is a reset switch that resets the programmable controller system, 1
Reference numeral 07 is an abnormality detection unit, 108 is a reset circuit unit, 109 is a buffer such as a data bus, and 110 and 111 are OR elements.

Reference numeral 200 is a data link control unit, 201 is a CPU, and 202 is a data link control unit 20.
A ROM storing an operating system program for controlling 0, a work RAM 203 for temporarily storing data and the like, a data link interface (data link I / F unit) 204, a reset circuit unit 205,
Reference numeral 207 is a 2-port RAM for communicating with the CPU control unit 100. Reference numeral 300 denotes an I / O unit section controlled by the CPU control section 100.

FIG. 15 is an explanatory diagram showing a system configuration in the case of connecting a plurality of programmable controllers using an optical cable or the like to execute distributed control. In the figure, 30 (M master station) and 35 (L1 local station) are shown. Station), 4
0 (L2 local station), 45 (L3 local station) are programmable controllers 31, 36, 41, respectively.
Reference numeral 46 is, for example, an optical cable. In addition, the following FIG.
6 to 19 are flowcharts for explaining the operation of the programmable controller configured as described above.

Next, the operation will be described. In FIG. 16, a power supply unit 10 connected to an AC power supply (not shown)
Generates a voltage 13 of 5V by the internal constant voltage circuit 11. The power supply unit 10 is connected as a power supply for driving the programmable controller. The user program created by the programming device (not shown) is
User memory 10 via peripheral device I / F (not shown)
4 and therefore, when the power supply unit 10 is set to the ON state, the operating system program stored in the ROM 102 starts operating and executes the processing of the user program stored in the user memory 104. To do. That is, after performing an output refresh process described later (S50), ON / O such as a limit switch (not shown) connected to the I / O unit section 300 is turned on.
The FF information is read as the input information, and the content is stored in the data RAM 105 as the input image information (S51: input refresh processing).

Next, the user program stored in the user memory 104 is sequentially operated by the CPU 101 based on the input image information stored in the data RAM 105 (S52). The calculated result is
The RAM 105 is sequentially stored as output image information. When the arithmetic processing of the user program is completed, counting up of devices such as a timer (not shown) and a counter (not shown) is executed as END processing (S53).

Next, the data link process (S54) is executed, and, for example, as shown in FIG. 15, the communication data between the M master station 30 and the L1 local station 35, L2 local station 40, and L3 local station 45 is converted to the optical cable. 31, 36, 4
1,46. Details of the data link processing in step S54 will be described later. When the data link processing in step S54 is completed, the data RA
Output image information stored in M105 to CPU1
01 reads out, writes in the I / O unit part 300 via the buffer 109, and executes an output refresh process (S50). That is, the motor, solenoid (not shown), etc. connected to the I / O unit section 300 are turned on / off.
The control target (not shown) is turned off and controlled.

Next, the operation of the data link processing in step S54 will be described with reference to FIG. M master station 3
At 0, of the output image information calculated by the calculation processing of step S52, the local stations 35, 4
The device information that needs to be transmitted to
1 writes to the 2-port RAM 207 and executes output refresh processing (S55). Further, the CPU unit 101
The received data from the local stations 35, 40, 45
The data is read from the port RAM 207, and the input refresh processing of the link data is completed (S56). At this time, regarding the received data from the local stations 35, 40, 45, the data received by the data link control unit 200 is assumed to be written in the 2-port RAM 207. The device information that needs to be transmitted to the local stations 35, 40, 45 is transmitted by the data link control unit 200 to each of the local stations 35, 40, 45.

Next, the operation of the data link controller 200 will be described with reference to FIG. When the power supply unit 10 is turned on similarly to the CPU control unit 100, the operating system program stored in the ROM 202 starts operating, and the device information transmitted from the local stations 35, 40, 45 is transferred to the data link I / F. It is received via the unit 204 (S57). The received device information from another station is written into the 2-port RAM 207 by the CPU unit 201 and becomes input image information of another station that can be used by the CPU control unit 100 (S58: input refresh processing). Similarly, the output image information written in the 2-port RAM 207 by the CPU control unit 100 is C
It is read by the PU unit 201 (S59: output refresh process) and transmitted as device information of the own station via the data link I / F unit 204 (S60).

The operation of the programmable controller has been described above with the M master station 30 as its own station. However, the same operation is performed even if the own station is, for example, the L1 local station 35, and comprehensive distributed control is possible. It has a simple structure.

The abnormality detection signal 14 output from the power supply unit 10 and the forced reset signal 118 output from the reset switch 106 are output to the CPU control unit 100.
Data link control unit 200, I / O unit unit 300
Is reset, and the WDT signal 11 output from the abnormality detection unit 107 that similarly detects an arithmetic abnormality
7 is configured to put the I / O unit section 300 in a reset state.

FIG. 19 is a flow chart for explaining the operation of monitoring the operating state of another station. For example, the data link I / F section 204 of the M master station 30 receives data (S61), and the CPU 201 determines whether or not the received data has an error (S62). Here, when it is determined that the received data has an error, it is determined whether or not the retry process is executed (S63). For example, the preset number of times a is compared with the number of errors n, and when it is determined that the number of errors n is less than the preset number a, retry processing is executed (S64), and conversely, When it is determined that the number of errors n exceeds the preset number a, it is determined that the relevant other station is abnormal, and error processing corresponding to it is executed (S65).

[0014]

Since the conventional programmable controller is configured as described above, in a distributed control system in which a plurality of programmable controllers are connected by an optical cable or the like, for example, one of the local stations has some abnormality. If it goes down, it is necessary to go to the place where the corresponding local station is installed and perform a reset operation etc. to restore the local station, which causes troublesome restoration work and reduces work efficiency. there were.

Further, when a plurality of distributed stations are started by different power sources, for example, when one local station is powered on later than the master station is powered on, it is determined that the local station is abnormal and the system is normal. Even though
In the distributed control system in which the distributed system does not start normally and the loop is continued (see FIG. 15), even if one station becomes an abnormal station, the entire system goes down, resulting in a problem that the operating efficiency of the system decreases. there were.

The present invention has been made in view of the above, and enables the recovery work without going to the place where the local station which is down due to an abnormality is installed, improving the work efficiency and distributing a plurality of distributions. Even if the station starts up with a separate power supply, the distributed system is normally started up.
Programmable controller capable of avoiding the whole system from going down due to an abnormal station and improving the operating efficiency of the system, and a specific other station reset method and other station reset in a distributed control system using the same The purpose is to obtain a factor detection method, an abnormal station monitoring method, a synchronization start method, and a synchronization stop method.

[0017]

In order to achieve the above object, a programmable controller according to the present invention and a method for resetting a specific other station, a reset factor detecting method for another station, and an abnormal station in a distributed control system using the same are provided. The monitoring method, synchronous start method and synchronous stop method are the power supply unit, C
In a programmable controller composed of a PU control means, a data link control means, and an I / O control means, the power supply unit has an abnormality detection means for detecting an abnormality of the power supply and outputting a power supply reset signal, and the CPU control means. Has a reset switch means for outputting a forced reset signal for forcibly resetting the device, the data link means is a data link interface for communicating with another station, a reset signal for resetting the CPU control means and the I / O control means. Generating means and reset means for resetting the data link control means, wherein the reset means of the data link control means is a power supply reset signal output from the abnormality detection means of the power supply unit and a reset switch means of the CPU control means. Reset signal based on the forced reset signal output from And outputs a.

In a distributed control system in which a plurality of programmable controllers are connected to execute distributed control, another station (n station) programmable controller that requires resetting is designated and the other station (n station) programmable controller A reset command is transmitted by data, the other station (n station) receives the reset command, a reset signal is generated based on the reset command, and at least C of the other station (n station) is generated by the reset signal.
The PU control means and the I / O control means are reset.

Further, in the programmable controller composed of a power supply unit, a CPU control unit, a data link control unit, and an I / O control unit, the power supply unit detects an abnormality of the power supply and outputs a power supply reset signal. The CPU control means includes reset switch means for outputting a forced reset signal for forcibly resetting the device and an abnormal reset signal output due to an abnormality such as a traffic congestion band. The control means has a data link interface for communicating with other stations and a reset means for resetting the data link control means, and the reset means of the data link control means has an I / O reset signal for resetting the I / O control means. It is controlled based on the above, and outputs a reset signal.

Further, in the programmable controller composed of a power supply unit, a CPU control unit, a data link control unit, and an I / O control unit, the power supply unit detects an abnormality of the power supply and outputs a power supply reset signal. The CPU control means includes reset switch means for outputting a forced reset signal for forcibly resetting the device and an abnormal reset signal output due to an abnormality such as a traffic congestion band. The control means is a data link interface for communicating with other stations, a reset signal generating means for resetting the CPU control means and the I / O control means, a reset means for resetting the data link control means, and a factor for activating the reset means section. Reset factor status information storing means for storing The reset means of the data link control means inputs an I / O reset signal for resetting the I / O control means, and an interrupt signal for the control means. And a reset signal is output.

In a distributed control system in which a plurality of programmable controllers are connected to execute distributed control, a reset signal is generated due to an abnormality in the programmable controller of another station (n station), and the other station (n) by the reset signal. (n station) at least the CPU control means and I / O control means in the programmable controller are reset, and the reset signal causes the data link control means in the other station (n station) programmable controller to generate an interrupt signal, The other station (n
Station) the factor of the reset signal is stored in a programmable controller, and after the reset factor is stored, the data link control means is reset for a certain period of time, and the other station (n
Station) The abnormal signal is transmitted via the data link interface in the programmable controller, and the own station (a station) programmable controller other than the n station receives the abnormal signal of the other station (n station) and the above abnormality occurs. After receiving the signal,
A reset factor request signal requesting a reset factor in the other station (n station) programmable controller is transmitted via the data link interface, and the reset factor request signal is received in the other station (n station) programmable controller. Send the stored reset factor,
The reset factor is received via a data link interface in the own station (station a) programmable controller.

Further, in the programmable controller composed of a power supply unit, a CPU control unit, a data link control unit, and an I / O control unit, the power supply unit detects an abnormality of the power supply and outputs an abnormality signal of power supply failure. The data link control means includes a data link interface for communicating with another station, reset signal generating means for resetting the CPU control means and I / O control means, reset means for resetting the data link control means, and the reset Reset factor status information storage means for storing a factor for activating the means, control means for reading the reset factor from the reset factor status information storage means, and power source switching means for switching to a backup power source, and power source switching of the data link control means The means is an abnormality detecting means for the power supply unit. Is switched to the backup power source from the power source supplied from the power source section, and at the same time, at least the data link interface in the data link control means is made operable by the backup power source by the power source disconnect signal. is there.

Further, in the programmable controller composed of the power supply unit, the CPU control unit, the data link control unit, and the I / O control unit, the power supply unit detects an abnormality of the power supply, and outputs an abnormality signal of the power supply. The data link control means includes a data link interface having specific data detection means for detecting reception of specific data communicating with another station, the CPU control means and I / O.
Reset signal generating means for resetting the O control means, reset means for resetting the data link control means, reset factor status information storage means for storing factors for activating the reset means, reset factor from the reset factor status information storage means Control means for reading out data, power supply switching means for switching to a backup power supply, control means for controlling the entire data link control means, storage means for storing a program for the control means to execute control processing, and execution by the control means. The power supply switching means of the data link control means, from the power supply supplied from the power supply portion to the backup power supply by the power-off signal from the abnormality detection means of the power supply portion. At the same time as switching, At least the control means in the data link control unit, storage means, the storage means to the standby state by the backup power source, and operable at least data link interface of the data link control in means, said data link interface,
When the specific data detection unit receives the specific data, at least the control unit, the storage unit, and the storage unit are changed from the standby state to the operating state.

Further, in a distributed control system in which a plurality of programmable controllers are connected to perform distributed control, a power failure of an AC power supply is detected, and the power supply and backup power supplied from the AC power supply are detected by the detected power failure signal. And a control means for controlling at least the entire data link control means of the data link control means while enabling the data link interface for communicating with the programmable controller of the other station by switching the voltage and the backup voltage switched by the switching. Storing means for storing the program for executing the control process, the storage means for storing the results and data executed by the control means is in a standby state, receiving specific data from the other station programmable controller, The specific data At least the control means in the data link control unit by receiving, storage means, it is an operable by said backup voltage storage means from the standby state.

In the programmable controller composed of the power supply unit, the CPU control unit, the data link control unit, and the I / O control unit, the data link control unit is activated in synchronization with the programmable controllers of other stations. The system is provided with a synchronous start permission flag unit, a system activation means for activating a distributed control system composed of a plurality of programmable controllers, and a system stop permission means for giving a system stop permission command to the distributed control system.

Further, in a distributed control system in which a plurality of programmable controllers are connected to execute distributed control, sequence processing is started by a synchronization start permission flag, and after the synchronization start permission flag is permitted, it is determined in advance. Synchronous start processing of the programmable controller that executes the sequence processing, synchronously start the distributed control system, monitor the standby state of the other station programmable controller, after the other station programmable controller has become standby,
System start command for transmitting the system start command and setting the synchronous start enable flag of the own station to the enable state in the distributed control system, and a system start method of the programmable controller of the programmable controller, and receiving the system start command from the system start designated station programmable controller. , And system activation processing of the system activation receiving station programmable controller in the distributed control system that sets the synchronization start permission flag of its own station to the permitted state.

In a distributed control system in which a plurality of programmable controllers are connected to execute distributed control, system stop is permitted, it is determined whether or not another station programmable controller is operating normally, and the other station programmable controller During normal operation, the system stop permission command is transmitted, the synchronization start permission flag of the local station is set to the non-permission state, the synchronization start permission flag is set to the non-permission state, and then the power supply of the local station is turned off. The system stop processing of the controller and the system stop permission command from the designated station programmable controller are received, and after the system stop permission command is received, the synchronization start permission flag of the own station is set to the non-permission state, and the synchronization start permission flag is set. A non-finger that turns off the power of its own station after it is set to the unauthorized state And executes a system stop processing stations programmable controller.

[0028]

In the programmable controller according to the present invention, the reset means of the data link control means is the power supply reset signal and C output from the abnormality detection means of the power supply section.
It is activated by a forced reset signal output from the reset switch means of the PU control means.

Further, the method of resetting a specific other station in the distributed control system according to the present invention designates another station (n station) programmable controller which requires resetting,
Other station (n station) Data transmission of the reset command of the programmable controller, the other station (n station) receives the reset command, generates a reset signal based on the reset command, and the other station (n station) receives the reset signal. ) At least the CPU control means and the I / O control means are reset.

In the programmable controller according to the present invention, the reset means of the data link control means is
It becomes active by an I / O reset signal that resets the I / O control means, and outputs a one-shot pulse as a reset signal.

In the programmable controller according to the present invention, the reset means of the data link control means is
An I / O reset signal for resetting the I / O control means is input, and an interrupt signal for the control means and a one-shot pulse after a certain period of time are output as a reset signal.

The reset factor detection method for another station in the distributed control system according to the present invention is a distributed control system in which a plurality of programmable controllers are connected to perform distributed control. A reset signal is generated due to an abnormality or the like, the reset signal resets at least the CPU control means and the I / O control means in the other station (n station) programmable controller, and the reset signal causes the other station (n station).
An interrupt signal is generated in the data link control unit in the programmable controller, the reset signal factor is stored in the other station (n station) programmable controller by the interrupt signal, and the data link control unit is reset for a certain time after the reset factor is stored. Then, the abnormal signal is transmitted via the data link interface in the other station (n station) programmable controller, and the other station (n station) abnormal signal is received by the own station (a station) programmable controller other than n station. Then, after receiving the abnormal signal, a reset factor request signal for requesting a reset factor in the other station (n station) programmable controller is transmitted via the data link interface to the other station (n station).
(Station) programmable controller receives a reset factor request signal, transmits the stored reset factor, and receives the reset factor via the data link interface in the own station (a station) programmable controller.

In the programmable controller according to the present invention, the power supply switching means of the data link control means is
At the same time that the power supply from the power supply unit is switched to the backup power supply by the power supply disconnection signal from the abnormality detection unit of the power supply unit, at least the data link interface in the data link control unit is made operable by the backup power supply by the power supply disconnection signal. .

Also, in the programmable controller according to the present invention, the power supply switching means of the data link control means is
At the same time that the power supply from the power supply unit is switched to the backup power supply by the power supply disconnection signal from the abnormality detection unit of the power supply unit, at least the control unit, the storage unit and the storage unit in the data link control unit are backed up by the power supply disconnection signal. To put the data link control means in a standby state, and at least the data link interface in the data link control means becomes operable. The data link interface makes the control means, the storage means, and the storage means stand by at least when the specific data detection means receives the specific data. From state to operating state.

Further, in the abnormal station monitoring method in the distributed control system according to the present invention, in the distributed control system in which a plurality of programmable controllers are connected to execute the distributed control, it is detected that the AC power supply has been cut off. A power supply cutoff signal is used to switch between a power supply supplied from an AC power supply and a backup voltage, and the backup voltage switched by the switching enables a data link interface that communicates with another station programmable controller, and at the same time, at least data of the data link control means. A control means for controlling the link control means as a whole, a storage means for storing a program for the control means to execute control processing, and a storage means for storing results and data executed by the control means are set in a standby state, Other station programmable controller It receives a specific data from the rollers, at least the control means in a data link control means by the reception of the specific data, storage means, and operable by a backup voltage storage means from the standby state.

Further, in the programmable controller according to the present invention, the data link control means is activated in synchronization with the programmable controllers of other stations by the synchronization start permission flag, and the system control means is a distributed control constituted by a plurality of programmable controllers. The system is activated, and the system stop permission means gives a system stop permission command to the distributed control system.

Further, the synchronous start method in the distributed control system according to the present invention, in the distributed control system in which a plurality of programmable controllers are connected to execute the distributed control, starts the sequence processing by the synchronous start permission flag and starts the synchronous start. Synchronous start processing of the programmable controller that executes a predetermined sequence processing after the permission flag is permitted,
A distributed control system that synchronously starts the distributed control system, monitors the standby status of the programmable controller of another station, sends a system start command after the programmable controller of the other station enters standby, and sets the synchronous start enable flag of the local station to the enabled state. System start command station in control system System start method of programmable controller and system start command station Program start receiving station programmable controller in the distributed control system that receives the system start command from the programmable controller Executes the system boot process of the controller.

Further, the synchronous stop method in the distributed control system according to the present invention permits the system stop in the distributed control system in which a plurality of programmable controllers are connected to execute the distributed control, and the programmable controllers of other stations are operating normally. After determining whether or not the other station programmable controller is operating normally, send a system stop permission command, set the own station's sync start permission flag to the non-permission state, and set the synchronization start permission flag to the non-permission state. , The system stop processing of the designated station programmable controller that turns off the power of its own station and the system stop permission command from the designated station programmable controller are received, and after the system stop permission command is received, the synchronization start permission flag of the own station is not permitted. And set the synchronization start permission flag to the non-permission state. Executes the system stop processing of non-designated stations programmable controller to turn OFF the own station power.

[0039]

【Example】

[Embodiment 1] FIG. 1 is a block diagram showing a schematic configuration (Embodiment 1) of a programmable controller according to the present invention. Those denoted by the same reference numerals as those of the conventional example have the same functions as those of the conventional example. Since it has a function, its description is omitted. The configuration of this embodiment is such that a reset signal generation circuit 206 is added to the data link control unit 200 in addition to the conventional programmable controller shown in FIG. Further, since the basic operation is the same as the conventional example, the description thereof will be omitted.

As shown in FIG. 15, when distributed control is executed by connecting the M master station 30 and the local stations (L1 to L3) 35, 40 and 45, for example, the CPU control unit of the L1 local station 35. 100 WDT due to some abnormality
When the signal 117 becomes active, the I / O reset signal 114 becomes active via the OR element 110 and becomes I / O reset signal 114.
The O unit unit 300 is in the reset state. At this time,
The CPU control unit 100 is in an abnormal state, for example,
It is forcibly reset.

The abnormality of the CPU control unit 100 is caused by 2 port R.
The data link control unit 200 is configured to suspend the data link control process shown in FIG. 18 in order not to execute the RD / WR process of the AM 207 (the data link process shown in FIG. 17). Further, the interruption of the data link control processing of the L1 local station 35 is, for example,
The M master station 30 detects that the L1 local station 35 is abnormal. In this state, the M master station is a personal computer (not shown)
It is usually possible to inform the maintenance personnel, etc., by connecting them etc. In this state, conventionally, it is necessary to go to another factory or the like in which the L1 local station 35 is installed and reset and restore the L1 local station 35. However, in this embodiment, In this way, the recovery operation can be performed at the place where the M master station 30 is installed.

That is, the abnormal station is designated on the personal computer connected to the M master station 30. Next, a reset command for the designated abnormal station (for example, L1 local station 35) is instructed on the personal computer. That is, a maintenance person or the like sends a reset command for the L1 local station 35 from the M master station 30 via the optical cable 31.

The reset command transmitted from the M master station 30 is the data link I / F unit 204 of the L1 local station 35.
Received by the CPU 2 of the data link control unit 200
From 01, it is determined to be the own station reset command of the own station (in this case, the L1 local station 35). Next, the CPU 201
The reset signal generation circuit 206 is activated, and the local station reset signal 116 is output. Own station reset signal 11
Since 6 is connected to the CPU control unit reset signal 119 via the OR element 113, as a result, the reset unit 108 in the CPU control unit 100 becomes active. That is, the active state of the reset unit 108 is
The CPU 101 is reset, and the abnormal state is released.

As described above, according to this embodiment, it becomes possible to restore the programmable controller installed in another factory or the like to the normal state in the centralized control room such as the office, the downtime can be shortened, and the loss cost can be reduced. It can contribute to minimization.

[Embodiment 2] FIG. 2 is a block diagram showing a schematic configuration (Embodiment 2) of a programmable controller according to the present invention. In the case where the CPU control unit 100 has an abnormality similar to that shown in FIG. 1, or when the data link control unit 200 is supplied with the control power from the power supply unit 10, the CPU control unit 100 and the data are A case where the relationship with the link control unit 200 is close will be described.

When the CPU controller 100 runs out of control, the data link controller 200 may run out of control as well. That is, the CPU control unit 100 becomes abnormal and L1
When the local station 35 becomes an abnormal station, the M master station 30 detects an abnormality of the L1 local station 35 and transmits a reset command to the L1 local station 35 as in the first embodiment. However, since the CPU 201 of the data link control unit 200 of the L1 local station 35 has also become abnormal due to a runaway, the reset command cannot be received. This problem is solved as follows.

That is, a reset circuit section 205a for resetting the data link control section 200 by the I / O reset signal 114 is provided, and the reset signal output from the reset circuit section 205a is a one-shot pulse.

Next, the operation will be described. When the CPU control unit 100 becomes abnormal and the WDT signal 117 becomes active, the I / O reset signal 11 is generated as in the first embodiment.
4 puts the I / O unit section 300 in the reset state, and the CPU control section 100 also goes into the reset state.
At this time, the CPU 201 of the data link control unit 200 is also in an abnormal state. However, I / O reset signal 1
Since 14 is input to the reset circuit unit 205a, the abnormal state of the CPU 201 is set to the reset state.

At this time, since the reset circuit section 205a is configured to output a one-shot pulse as a reset signal, the CPU 201 is released from the reset state. That is, although the data link control unit 200 is in an abnormal state due to noise or the like, the data link control unit 200 is forcibly set to the reset state and returns to the normal state after a certain time period (after the one shot pulse time period has elapsed). Therefore, M
The reset command from the master station 30 is made ready to be received. Since other operations are the same as those in the first embodiment,
The description is omitted. At this time, the CPU control unit 100 causes the I
Since the I / O unit section 300 is controlled, it is normal to prevent it from automatically returning. (Normally, the data is connected to the I / O unit section 300. Be done).

[Third Embodiment] FIG. 3 is a block diagram showing a schematic configuration (third embodiment) of a programmable controller according to the present invention. In this embodiment, when an abnormality occurs in the programmable controller and the I / O unit section 300 is in the reset state, the cause is the M master station 30.
It relates to a programmable controller capable of transmitting the information to other stations.

A status information reading unit 209 is added to the configuration of the programmable controller shown in FIG.
As its reset factors, for example, the own station reset signal 116, the WDT signal 117, and the forced reset signal 118 are connected to the input. Further, the reset circuit unit 205b of the data link control unit 200 outputs an INT signal 210 that operates as an interrupt signal to the CPU 201 and a data link control unit reset signal 211 that resets the data link control unit 200 as outputs. . Since the basic operation is the same as that of the conventional example or the above-mentioned other embodiments, the description thereof will be omitted.

Next, the operation will be described. If the CPU control unit 100 becomes abnormal and the WDT signal 117 becomes active, for example, the I / O will become similar to that shown in FIG.
The reset signal 114 becomes active and sets the I / O unit section 300 in the reset state. At this time, at the same time, the I / O reset signal 114 is transmitted to the data link control unit 20.
0 is input to the reset circuit unit 205b, so I
The NT signal 210 becomes active.

Since the reset circuit section 205b is composed of the delay circuit 401 and the one-shot circuit 402 as shown in FIG. 4, it is predetermined by the delay circuit 401 after the INT signal 210 becomes active. A one-shot signal is output by the one-shot circuit 402 after a lapse of time, and becomes the reset signal 211 of the data link control unit 200.

Next, the INT signal 210 is sent to the CPU 201.
Since it is connected as an interrupt input to INT signal 21
When 0 becomes active, the CPU 201 executes a predetermined interrupt process. That is, since this interrupt process executes the INT process shown in FIG. 5, first, the reset factor is detected by reading the status information from the status information reading unit 209 (RD) (S10). In this case, since the WDT signal 117 is active, the abnormality detection unit 1 of the CPU control unit 100
It can be determined that 07 is activated. Next, the reset factor read by the status information reading unit 209 is stored in the work RAM 203 (S11), and the interrupt process is completed. At this time, the delay circuit 401 is set in the reset circuit unit 205b so that the reset signal 211 of the data link control unit 200 does not become active until the interrupt process is completed.
It is surely stored in the work RAM 203.

Next, the data link control unit 200 is reset by the reset signal 211 of the data link control unit 200, and an abnormal signal is transmitted to the M master station 30. That is, the reset state means that the data transmission / reception via the data link I / F unit 204 is interrupted, and as a result, the M master station 30 is notified that the L1 local station 35 is abnormal, for example. Become.
This down state is notified to the maintenance person by some means, and a reset factor request signal (not shown) is transmitted from the M master station 30.

At this time, the data link control unit 200 of the L1 local station 35 has been released from reset because the reset signal 211 of the data link control unit 200 is a one-shot pulse, and the data link I / F unit 204 receives. It is ready. Therefore, the CPU 201, which has decoded the reset factor request signal, operates in the work RAM 20.
3. Reset factor (in this case, WDT signal 117)
Is read out, and the reset factor is transmitted from the data link I / F unit 204. The M master station 30 requesting the reset factor obtains the reset factor (WDT signal 117) by the same receiving method as the normal data,
The maintenance person will know that the abnormality detection unit 107 of the L1 local station 35 has been activated.

With the above-mentioned configuration, the abnormality of the programmable controller left in another factory can be easily judged in the centralized control room in the office or the like, so that the time required for returning to the normal state can be shortened. Can be expected to be effective.

[Embodiment 4] In the above embodiment, I
Although the operation is described using the NT signal 210 as the interrupt signal of the CPU 201, as another embodiment, the signal is not input as the interrupt signal of the CPU 201 but is input to the status information reading unit 209.
The same effect can be expected in terms of hardware as a latch (memory trigger by flip-flop) signal. In this case, in the reset factor storage stage, only the difference is stored between the work RAM 203 by software and the hardware by the flip-flop (in this embodiment, the status information reading unit 209 is the flip-flop). Will be composed of storage elements such as).

[Fifth Embodiment] FIG. 6 is a block diagram showing a schematic configuration (fifth embodiment) of a programmable controller according to the present invention. This embodiment relates to an improvement of the programmable controller shown in FIG. That is, in the system shown in FIG. 3, for example, when the power supply of the L1 local station 35 is down due to a power failure or the like, the data link I / F unit 204 does not operate at all and the cause of the abnormality cannot be detected. Have difficulty. Further, the data link system shown in FIG. 15 goes down. This embodiment solves this problem, and the power supply switching circuit 2
12 is provided, and the power supply switching circuit 212 is provided by the power-off signal 15.
To operate.

That is, the power supply unit 10 generates a DC voltage 13 (usually DC 5V) from the AC power supply (not shown) by the constant voltage circuit 11, which drives the CPU control unit 100 and the data link control unit 200. Becomes Further, the abnormality detection circuit 12 detects the value of the DC voltage, and, for example,
If the voltage drops below 80%, it is considered that the power is cut off and the power cut signal 1
5 is made active, and the abnormality detection signal 14 that operates as a reset signal when 70% or less is made active.

The power-off signal 15 is sent to the power switching circuit 21.
2 is input, and when this signal becomes active (power failure), the power switching circuit 212 causes the data link I / F.
The unit 204 or the entire data link control unit 200 is configured to switch to a backup power source of a battery (not shown).

Next, the operation will be described. When the AC power supply (not shown) is normal, the power-off signal 15 is inactive, and the power supply switching circuit 212 supplies the DC voltage 13 generated by the AC power supply. Next, when the AC power supply fails, the power-off signal 15 becomes active, and the power supply switching circuit 212 supplies a backup voltage for the battery or the like. At this time, the power supply switching circuit 21
2 is connected to the data link I / F unit 204 (not shown). That is, when the AC power supply fails, only the data link I / F unit 204 is in an operable state, so data is received from the M master station 30 and the received data is transmitted to the L2 local station 40.

Therefore, in the conventional system, in the data link system shown in FIG.
For example, when the L1 local station 35 is stopped due to a power failure, the data link system itself is down. However, according to the present embodiment, the data link system shown in FIG. The adverse effect of is minimized.

[Sixth Embodiment] A sixth embodiment will be described with reference to FIG. In the battery backup of the data link I / F unit 204, it is possible to prevent the system down of the entire data link system shown in FIG. However, the station (for example, L
Information of one local station 35) cannot be obtained at the M master station 30. In the present embodiment, in order to solve this problem, the CPU 201 of the data link control unit 200,
The ROM 202, the work RAM 203, and the data link I / F unit 204 are backed up by a battery.

Next, the operation will be described. When the AC power of the L1 local station 35 is cut off, the power-off signal 1
5 is output from the abnormality detection circuit 12, and the power-off switching circuit 2
12 is in the battery backup mode. That is, before the power failure, the CPU 201 and the ROM 202
The RAM 203 and the data link I / F unit 204 were operated by the DC voltage 13 generated from the AC power supply, respectively, but at the time of power failure, they are driven by a backup voltage (not shown) such as a battery. It At this time, since the CPU 201, the ROM 202, and the RAM 203 are configured to be in the low power consumption mode (standby mode), it is considered that the battery consumption is minimized (the CPU and the like have low power consumption). Various methods are known for setting the mode, such as slowing down the operation clock of the CPU, and the description thereof is omitted here).

Since the data link I / F section 204 is always operable by the backup voltage, the reason why the data link system shown in FIG. 17 does not go down is the same as that explained above. Therefore omitted. Next, when a request such as a reset factor request signal is transmitted from the M master station 30, the L1 local station 35 determines that it has received the specific data and executes the following operation. That is, in the data link I / F unit 204, the specific data is discriminated by hardware, and the specific data discriminating signal (not shown) discriminated as the specific data is sent to the CPU 201 and the RO.
The M202 and the RAM 203 are changed from the standby mode to the normal operable state.

In the case where the above-mentioned specific data discriminating signal becomes active and enters a normal operation state, the same operation as that shown in FIG. 3 is performed, and therefore detailed description will be omitted. However, in the case shown in FIG. 3, the reset operation due to the power failure cannot be detected, but in this embodiment, the reset operation during the power failure can also be detected as a factor. The operation will be described below.

When the AC power supply of the L1 local station 35 fails, the abnormality detection signal 14 becomes active after the power-off signal 15 becomes active as described above. The abnormality detection signal 14 passes through the OR element 111 and the OR element 113, and the reset circuit section 10 of the CPU control section 100.
8 is activated to put the CPU 101 in a reset state (eliminating unstable operation due to a drop in DC voltage), and at the same time, the I / O reset signal 114 becomes active via the OR element 110, and the I / O unit section 300 is reset. It becomes a state. At the same time, since the I / O reset signal 114 is input to the reset circuit unit 205b of the data link control unit 200, the INT signal 210 becomes active.

CPU 201, ROM 202, RAM
Since 203 is set to the standby mode after a predetermined time, the normal operation is possible when the INT signal 210 becomes active. Therefore, the interrupt process described with reference to FIG. 3 is executed. Complete. That is, the RAM 203 stores the reset factor (in this case, power failure or momentary power failure). After that, the data link control unit 200 is reset by the reset signal 211 and enters the standby mode. Thereafter, the operation described above is executed. In addition, it is possible to change the normal operation state to the standby state by deactivating the specific data link determination signal.

[Embodiment 7] FIG. 7 is a block diagram showing a schematic configuration (Embodiment 7) of a programmable controller according to the present invention. In the distributed control system as shown in FIG. 15, the M master station 30 and the L1 local station 35
Etc. are usually operated by a separate power source. In the related art, for example, the M1 master station 30 is started up before the L1 local station 35, which is a local station, is started up. there were.

In this embodiment, in order to solve the above problem, a synchronization start permission flag section 260, a system starting means 262 and a system stop permitting means 264 are provided. The basic operation of the programmable controller shown in FIG. 7 has already been described, and will be omitted here.

First, the synchronous start permission flag section 260 shown in FIG. 7 will be described. The synchronization start permission flag unit 260 is provided in the E ² PROM or the flash ROM.
Also, since it is stored in a battery or the like, it is assumed that the state is stored even during a power failure. And
When the synchronization start permission flag is "1", for example, the distributed control system shown in FIG. 15 synchronizes to start the operation of each programmable controller, and, for example, "0".
, Each programmable controller is configured to operate asynchronously.

Next, the operation will be described with reference to FIG. When the power is turned on, the CP of the CPU control unit 100
U101 confirms the state of the synchronization start permission flag.
That is, the CPU 101 outputs a synchronization start permission flag read request to the CPU 201 of the data link control unit 200 via the 2-port RAM 207. The CPU 201 reads the synchronization start permission flag stored in the synchronization start permission flag unit 260 and transfers it via the 2-port RAM 207.

If the received information is "1", CPU1
01 does not execute the sequence process, outputs the synchronization start permission flag read request again, and executes the same operation.
A synchronization waiting state with another station is set (S12). When the received information changes to "0", output refresh processing (S13), input refresh processing (S14), arithmetic processing (S15), END processing (S16), and data link processing (S17) are executed, The same sequence processing as the conventional one is started (see the section A in FIG. 13).

When the distributed control system is in operation, the synchronous start permission flag is normally in the "0" state. Therefore, for example, when the power supply of the L1 local station 35 recovers from the disconnected state due to a momentary power failure or the like, the CPU 101 executes the operation shown in FIG. 8. However, at this time, since the synchronization start permission flag is "0", the sequence processing is immediately executed without the "synchronization waiting" state. Also,
The termination of the sequence processing is performed regardless of the synchronization start permission flag, and for example, the sequence processing is terminated when the power of the L1 local station 35 is cut off (see FIG. 13B portion).

Next, the operation of changing the synchronization start permission flag from "1" to "0" will be described. For example, the programmable controller of the M master station 30 has a system start-up means 262, and whether or not the synchronous start of the distributed control system shown in FIG. 15 can be set (in this case, the M master station 30 is the system). Programmable controller to start designated station). That is, the M master station 30
When the power is turned on, the data link control unit 200 of the M master station 30 becomes operable, and the CPU 201
The processing operation shown in FIG. 9 is executed. That is, it is judged whether the system starting means 262 is ON / OFF (S18), and if the system starting means 262 is set to require the synchronous start, it is judged to be in the ON state and the process of the next step is executed.

Next, another station (for example, L1 local station 35)
Check the operation (standby) status (S1)
9). That is, for example, when the power supply of the L1 local station 35 is still in the OFF state, the distributed control system shown in FIG. 15 does not enter the standby state but enters the waiting state and continuously monitors other stations.

Next, when the power supply of the L1 local station 35 is turned on and the distributed control system is in the standby state, the processing of the next step is executed. That is, a system activation command is transmitted from the M master station 30 to another station (S2
0), after the transmission process is completed, "0" is set in the synchronization start permission flag section 260 of the own station (M master station 30) (S).
21). Hereinafter, the processing operations after step S12 shown in FIG. 8 are executed to execute the CPU control unit 10 of the M master station 30.
0 starts the sequence processing.

Next, the operation of another station (for example, the L1 local station 35) that has received the system activation command transmitted from the M master station 30 will be described. L1 local station 35
When the power is turned on, the data link I / F unit 204 of the data link control unit 200 can transmit and receive.
When the received data is transmitted as it is, or when a certain specific data is transmitted to enter the standby state, another station (for example, M
Notify the master station 30).

Next, the system waits for reception of the system start command, and as shown in FIG. 10, it is judged whether or not the system start command is received (S22). As a result, when the system start command is received, the process of the next step is executed. That is, similar to the M master station 30, "0" is set in the synchronization start permission flag section 260 of another station (for example, the L1 local station 35) (S23). Below, M master station 30
The same operation is executed and the sequence processing of the L1 local station 35 is started.

Next, the system stop operation of the distributed control system shown in FIG. 15 will be described. The system stop permitting means 264 shown in FIG. 7 is composed of, for example, a key switch (not shown), and here, for example,
A case where the maintenance person stops the system with the programmable controller of the L1 local station 35 will be described.

When the maintenance person turns on the key switch, the system stop permitting means 264 becomes active. The CPU 201 of the data link control unit 200 detects the state and judges the ON / OFF state (S24). ON
If it is determined that the state is present, the operation of the next step is executed. That is, other stations (in this case, M master station 30, L2
The operating states of the local station 40 and L3 local station 45) are checked (S25), and if it is determined that the other station is operating normally, a system stop permission command is transmitted from the L1 local station 35 to the other station (S26). . Next, after the transmission of the system stop permission command is completed, the synchronization start permission flag of its own station (in this case, the L1 local station 35) is set to "1" and the synchronization start permission flag unit 260 is reset (S27). ). This state corresponds to the D section in FIG. If it is determined in step S25 that the other station is operating abnormally, error processing is executed (S2).
8).

Since a series of these operations are instantaneously performed, the maintainer turns on the key switch and then turns off the power of the L1 local station 35, and in the state of the portion B of FIG. It becomes possible to suspend the sequence processing of (1) and bring it to a stopped state (the synchronous start permission flag is in the state of "1").

Next, the operation of the other station will be described. Since the basic operations are all the same, for example, L2 local station 4
0 will be described. The system stop permission signal transmitted from the L1 local station 35 is the data link I / F unit 2
It is received by the L2 local station 40 via 04. It is determined whether the received data is a system stop permission signal (S2
9) If it is determined that the received data is the system stop permission signal, the synchronization start permission flag is set to "1" and the reset process is executed (S30).

That is, like the L1 local station 35,
Synchronization start permission flag unit 260 of the L2 local station 40
Is in the reset state and is in the state of section D in FIG.
After that, by turning off the power, the L2 local station 40 can be brought into the state of section B in FIG. Where L2
The local station 40 receives the system stop permission signal and executes the processes (steps S29 and S30), and at the same time, the data link I / F unit 204 transmits the system stop permission signal to the next station (in this case, the L3 local station 45). ), The L3 local station 45 also operates at the same time. That is, each programmable controller that constructs the distributed system illustrated in FIG. 15 can be stopped in the state of the part B in FIG. 13.

Here, even when the programmable controller is powered off, since the synchronous start permission flag section 260 is stored and held in the flash ROM or the like, when the power is turned on again to start up the system, FIG. The operation similar to that of the section A is repeated in the section E of FIG. 13, and as a result, each programmable controller of the system can start synchronously.

Next, application examples of each of the above embodiments will be described.
Firstly, the reset signal generation circuit 206 includes the CPU unit 20.
The reset signal generation circuit 206 has been described as being activated by software by 1 (see FIG. 1).
C decodes the specific data (reset command) received by the data link I / F unit 204 by hardware,
The same effect can be obtained by directly outputting the own station reset signal 116 without going through the PU 201.

Secondly, the description has been given by connecting only the reset factor as the input signal of the status information reading section 209.
The same effect can be obtained by adding other abnormal information or normal information as an input signal.

Third, the INT signal 210 is sent to the CPU section 20.
I explained the operation applied as an interrupt signal of 1.
The same effect can be obtained by using the T signal 210 as a latch signal for the status information reading unit 209.

Fourthly, the same effect can be obtained even if "1" and "0" are reversed in the synchronization start permission flag.

Fifth, the distributed control system has been described as a loop connection, but the same effect can be obtained by connecting it by bus connection or the like.

Sixth, the system stop permitting means 264,
Although the key switch has been described, there is a similar effect as a hardware configuration in which it is turned on after a certain period of time after the synchronization is started. Further, a clock function or the like is incorporated so that it is turned on at a certain time. Has the same effect.

[0093]

As described above, the programmable controller according to the present invention and the method for resetting a specific other station, the reset factor detecting method for another station, the abnormal station monitoring method, the synchronous starting method and the synchronous stop in the distributed control system using the same. According to the method, firstly, a programmable controller installed in another factory or a distant place can be normally restored in a central control room in an office or the like. Secondly, the reset factor (abnormality factor) of the abnormal programmable controller can be transmitted to the normal programmable controller (for example, M master station). Third
In addition, even if the abnormal programmable controller is in a power-off state such as a power failure, the cause can be detected (transmitted). Fourth, even if one programmable controller goes down,
Avoids the entire distributed control system going down. Fifth, it enables synchronous start of the distributed control system.

To summarize the above effects, it is possible to perform the recovery work without going to the place where the local station that is down due to an abnormality is installed, improving the work efficiency and using a plurality of distributed stations with different power sources. Even when the system starts up, the distributed system is started normally, and in the distributed control system where the loop is continued, it is possible to prevent the entire system from going down due to one station becoming an abnormal station, and to improve the operating efficiency of the system. Can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration (first embodiment) of a programmable controller according to the present invention.

FIG. 2 is a block diagram showing a schematic configuration (second embodiment) of a programmable controller according to the present invention.

FIG. 3 is a block diagram showing a schematic configuration (third embodiment) of a programmable controller according to the present invention.

FIG. 4 is a block diagram showing a schematic configuration of a reset circuit unit of the programmable controller according to the present invention.

FIG. 5 is a flowchart showing an operation of INT processing.

FIG. 6 is a block diagram showing a schematic configuration (fifth embodiment) of a programmable controller according to the present invention.

FIG. 7 is a block diagram showing a schematic configuration (Embodiment 7) of a programmable controller according to the present invention.

8 is a flowchart showing an operation of the programmable controller shown in FIG.

9 is a flowchart showing an operation of the programmable controller shown in FIG.

10 is a flowchart showing an operation of the programmable controller shown in FIG.

11 is a flowchart showing an operation of the programmable controller shown in FIG.

12 is a flowchart showing the operation of the programmable controller shown in FIG.

FIG. 13 is a timing chart showing the timing of each part of the programmable controller according to the present invention.

FIG. 14 is a block diagram showing a schematic configuration of a conventional programmable controller.

FIG. 15 is an explanatory diagram showing an outline of a distributed control system.

16 is a flowchart showing an operation of the programmable controller shown in FIG.

FIG. 17 is a flowchart showing a data link process of the programmable controller shown in FIG.

18 is a flowchart showing the operation of the programmable controller shown in FIG.

19 is a flowchart showing the operation of the programmable controller shown in FIG.

[Explanation of symbols]

 10 Power Supply Section 11 Constant Voltage Circuit 12 Abnormality Detection Circuit 100 CPU Control Section 106 Reset Switch 107 Abnormality Detection Section 108 Reset Circuit Section 200 Data Link Control Section 202 ROM 203 Work RAM 204 Data Link I / F Section 205, 205a, 205b Reset Circuit Part 206 Reset signal generating circuit 209 Status information reading part 212 Power supply switching circuit 260 Synchronous start permission flag part 262 System starting means 264 System stop allowing means 300 I / O unit part

[Procedure amendment]

[Submission date] September 20, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction content]

Next, the operation will be described. In FIG. 14 , a power supply unit 10 connected to an AC power supply (not shown)
Generates a voltage 13 of 5V by the internal constant voltage circuit 11. The power supply unit 10 is connected as a power supply for driving the programmable controller. The user program created by the programming device (not shown) is
User memory 10 via peripheral device I / F (not shown)
4 and therefore, when the power supply unit 10 is set to the ON state, the operating system program stored in the ROM 102 starts operating and executes the processing of the user program stored in the user memory 104. To do. That is, after performing an output refresh process described later (S50), ON / O such as a limit switch (not shown) connected to the I / O unit section 300 is turned on.
The FF information is read as the input information, and the content is stored in the data RAM 105 as the input image information (S51: input refresh processing).

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0039

[Correction method] Change

[Correction content]

[0039]

[Embodiment 1] FIG. 1 is a block diagram showing a schematic configuration (Embodiment 1) of a programmable controller according to the present invention, and components having the same reference numerals as those of the conventional example will be described in the conventional example. Since it has the same function as the above-mentioned function, its explanation is omitted. The structure of this embodiment, in which the reset signal generating circuit 206 to the data link control unit 200 are added to the programmable controller in prior art shown in FIG. 14. Further, since the basic operation is the same as the conventional example, the description thereof will be omitted.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0040

[Correction method] Change

[Correction content]

As shown in FIG. 15, when distributed control is executed by connecting the M master station 30 and the local stations (L1 to L3) 35, 40 and 45, for example, the CPU control unit of the L1 local station 35. 100 WDT due to some abnormality
When the signal 117 becomes active, the I / O reset signal 114 becomes active via the OR element 110 and becomes I / O reset signal 114.
The O unit unit 300 is in the reset state. At this time,
The CPU control unit 100 is in an abnormal state .

[Procedure amendment 4]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 13

[Correction method] Change

[Correction content]

[Fig. 13]

Claims (11)

[Claims] 1. A programmable controller comprising a power supply unit, a CPU control unit, a data link control unit, and an I / O control unit, wherein the power supply unit detects a power supply abnormality and outputs a power supply reset signal. And the CPU control means has reset switch means for outputting a forced reset signal for forcibly resetting the device, and the data link means has a data link interface for communicating with another station, the CPU control means and I / O. O reset means for resetting the control means, reset means for resetting the data link control means, reset means of the data link control means, the power supply reset signal output from the abnormality detection means of the power supply unit and Forced reset signal output from the reset switch means of the CPU control means A programmable controller which outputs a reset signal based on the signal. 2. A distributed control system for connecting a plurality of programmable controllers to execute distributed control,
The other station (n station) programmable controller that requires resetting is designated, the reset command of the other station (n station) programmable controller is transmitted by data, and the other station (n station) receives the reset command, A reset signal is generated based on the reset command, and at least CP of the other station (n station) is generated by the reset signal.
A method of resetting a specific other station in a distributed control system, characterized in that U control means and I / O control means are reset. 3. A programmable controller comprising a power supply unit, a CPU control unit, a data link control unit, and an I / O control unit, wherein the power supply unit detects an abnormality in the power supply and outputs a power supply reset signal. The CPU control means includes reset switch means for outputting a forced reset signal for forcibly resetting the device and an abnormal reset signal output due to an abnormality such as a traffic congestion band. The control means has a data link interface for communicating with other stations and a reset means for resetting the data link control means, and the reset means of the data link control means has an I / O reset signal for resetting the I / O control means. Programmable controller characterized in that it is controlled based on . 4. A programmable controller comprising a power supply unit, a CPU control unit, a data link control unit, and an I / O control unit, wherein the power supply unit detects an abnormality in the power supply and outputs a power supply reset signal. The CPU control means includes reset switch means for outputting a forced reset signal for forcibly resetting the device and an abnormal reset signal output due to an abnormality such as a traffic congestion band. The control means is a data link interface for communicating with other stations, a reset signal generating means for resetting the CPU control means and the I / O control means, a reset means for resetting the data link control means, and a factor for activating the reset means section. For storing reset factor status information, said reset factor status The data link control means has a control means for reading out a reset factor from the information storage means, and the reset means of the data link control means resets the I / O control means.
A programmable controller which receives an O reset signal and outputs an interrupt signal to the control means and a reset signal. 5. A distributed control system for connecting a plurality of programmable controllers to execute distributed control,
A reset signal is generated due to an abnormality in the other station (n station) programmable controller, and at least the CPU control means and the I / O control means in the other station (n station) programmable controller are reset by the reset signal. An interrupt signal is generated by the reset signal in the data link control means in the other station (n station) programmable controller, and a factor of the reset signal is stored in the other station (n station) programmable controller by the interrupt signal. After storing the reset factor, the data link control means is reset for a certain period of time, an abnormal signal is transmitted via the data link interface in the other station (n station) programmable controller, and the own station (a
Station) programmable controller, the other station (n
Station), and after receiving the abnormal signal, a reset factor request signal for requesting a reset factor in the other station (n station) programmable controller is transmitted through the data link interface to the other station (n station). Station) the reset factor request signal is received in the programmable controller, the stored reset factor is transmitted, and the reset factor is received via the data link interface in the own station (a station) programmable controller. Detecting method of reset factor of other station in distributed control system. 6. A programmable controller composed of a power supply unit, a CPU control unit, a data link control unit, and an I / O control unit, wherein the power supply unit detects an abnormality in the power supply and outputs a power-off signal. The data link control means includes a data link interface for communicating with another station, reset signal generating means for resetting the CPU control means and I / O control means, reset means for resetting the data link control means, and the reset Reset factor status information storage means for storing a factor for activating the means, control means for reading the reset factor from the reset factor status information storage means, and power source switching means for switching to a backup power source, and power source switching of the data link control means The means is the power from the abnormality detecting means of the power supply section. The power supply signal is used to switch from the power supply supplied from the power supply unit to the backup power supply, and at the same time, at least the data link interface in the data link control means is made operable by the backup power supply by the power supply cut-off signal. And programmable controller. 7. A programmable controller composed of a power supply unit, a CPU control unit, a data link control unit, and an I / O control unit, wherein the power supply unit detects an abnormality in the power supply and outputs a power-off signal. The data link control means includes a data link interface having specific data detection means for detecting reception of specific data communicating with another station, and reset signal generation means for resetting the CPU control means and I / O control means. Reset means for resetting the data link control means, reset factor status information storage means for storing a factor for activating the reset means, control means for reading a reset factor from the reset factor status information storage means,
Power supply switching means for switching to a backup power supply, control means for controlling the entire data link control means, storage means for storing a program for the control means to execute control processing, results and data executed by the control means The power supply switching means of the data link control means has a storage means for storing, and at the same time the power supply from the power supply portion is switched to the backup power supply in response to a power-off signal from the abnormality detection means of the power supply portion, By the power-off signal, at least the control means, the storage means, and the storage means in the data link control means are put in a standby state by the backup power source, and at least the data link interface in the data link control means is made operable, and the data link The interface is the specific data detecting means. By to receive the specific data, at least the control means, storage means, a programmable controller, characterized by the operating state storage means from the standby state. 8. A distributed control system for connecting a plurality of programmable controllers to execute distributed control,
A data link that detects a power failure of an AC power supply, switches between a power supply supplied from the AC power supply and a backup voltage by the detected power failure signal, and communicates with another station programmable controller by the backup voltage switched by the switching. Control means for activating the interface and controlling at least the entire data link control means of the data link control means, storing means for storing a program for the control means to execute control processing, and executed by the control means. The storage means for storing the result and data is put in the standby state, and the specific data is received from the programmable controller of the other station,
A method of monitoring an abnormal station in a distributed control system, characterized in that at least the control means, the storage means, and the storage means in the data link control means are made operable by the backup voltage by receiving the specific data. 9. A programmable controller comprising a power supply section, a CPU control means, a data link control means, and an I / O control means, wherein the data link control means is activated in synchronization with another station programmable controller. A synchronous start permission flag unit, a system activation unit for activating a distributed control system including a plurality of programmable controllers, and a system stop permission unit for giving a system stop permission command to the distributed control system. Programmable controller. 10. In a distributed control system for connecting a plurality of programmable controllers to execute distributed control, sequence processing is started by a synchronous start permission flag, and after the synchronous start permission flag is permitted, it is predetermined. Synchronous start processing of the programmable controller that executes the sequence processing, synchronously start the distributed control system, monitor the standby state of the other station programmable controller, after the other station programmable controller has become standby,
System start command for transmitting the system start command and setting the synchronous start enable flag of the own station to the enable state in the distributed control system, and a system start method of the programmable controller of the programmable controller, and receiving the system start command from the system start designated station programmable controller. , Synchronous activation method in a distributed control system, which executes system activation processing of a receiving station programmable controller in a distributed control system in which its own synchronization start permission flag is set to an enabled state. 11. A distributed control system for executing distributed control by connecting a plurality of programmable controllers, permitting system stop, determining whether or not another station programmable controller is operating normally, and said other station programmable controller During normal operation, the system stop permission command is transmitted, the synchronization start permission flag of the local station is set to the non-permission state, the synchronization start permission flag is set to the non-permission state, and then the local station power is turned off. The system stop processing of the controller and the system stop permission command from the designated station programmable controller are received, and after the system stop permission command is received, the synchronization start permission flag of the own station is set to the non-permission state, and the synchronization start permission flag is set. Non-designated station that turns off its own station power after making it in the unauthorized state A synchronous stop method in a distributed control system, comprising: performing a system stop process of a programmable controller.