JP2827539B2 - Peripheral device of programmable controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a peripheral device for a programmable controller. More specifically, the present invention relates to a peripheral device of a programmable controller that appropriately selects and executes processing corresponding to a connected external device.

[0002]

2. Description of the Related Art FIG. 11 is a block diagram showing a peripheral device (500) of a conventional programmable controller.
(1) a CPU, (2) a program memory composed of a ROM and a RAM, (3) a work area memory composed of a RAM, (4) an auxiliary storage device composed of a magnetic disk or the like, (505) is an input / output interface for connecting an external device, (5a) is a connection terminal, (6) is an external device connected to the input / output interface, (6a) is a control signal line, (7) is a display, 8) is a display interface, (9) is a keyboard, (1)
0) is a keyboard interface, (11) is an internal bus, and (5P) is a PC interface for connecting to a programmable controller.

Next, the operation will be described. The processing for the external device (6) connected to the input / output interface (505) is usually processed by an interrupt. This interrupt is issued to the peripheral device (50
0) and the control signal line (6 ) connecting the external device (6).
a) from the H level to the L level
Level change or vice versa).

FIG. 12 is a flowchart showing the processing of the CPU (1) when an interrupt occurs. When an interrupt occurs in step S0, the current program execution pointer value information is saved in step S1. Next, step S
Proceeding to step 2, the data table storing the start address information of each interrupt program corresponding to the interrupt cause is searched, and the start address information of the interrupt program corresponding to each interrupt cause is read.

Next, in step S3, the read start address information is written into a program execution pointer. Further, in step S4, the program is executed from the address indicated by the program execution pointer. Therefore, the processing of the interrupt program corresponding to the interrupt factor is executed.
When the interrupt program processing ends, the process proceeds to step S5 and returns to the normal processing.

FIG. 13 is a flowchart showing the processing of an interrupt program. When the processing shifts to the processing of the interrupt program in step S40, the processing proceeds to step S41, and processing for an external device is executed. Then, step S42
Then, the process returns to the normal process, and ends in step S43.

FIG. 14 is a block diagram showing a case where a serial printer (22) or a parallel printer (23) is connected to a peripheral device (600) of a conventional programmable controller. (616) is a main unit of the peripheral device of the programmable controller, (17) is a serial printer interface, (18) is a parallel printer interface, (19) is a keyboard, (20) is a mouse, and (21) is a display.

FIG. 15 is a flowchart showing a printer selection process in the peripheral device (600) of the programmable controller. (37) shows a connected printer selection input process, and (38) shows a connected printer initial process.

First, connection printer selection input processing (37)
I do. That is, the user, the keyboard while watching the display unit (34) (32) or row physician to select either a serial printer or parallel printer with a mouse (33) (Step
(Step S371), and performs a process according to the selection result (Step S371).
Step S372). When a serial printer is selected
The serial printer flag (“ON”
), The parallel printer flag is not set (“OF
F ”) (step S373).
If a linter is selected, the serial printer flash
(“OFF”) and the parallel printer flag
(Step S37)
4). Next, in the connection side printer initial processing (38), the initial processing of the selected printer is performed.
(Step S381) .

[0010]

A conventional programmable controller peripheral device (500) shown in FIG.
Since the processing of the interrupt program corresponding to the input / output interface (505) is performed, the external device connected to the input / output interface (505) and the processing of the interrupt program corresponding to the input / output interface (505) are different.
You need to respond correctly. If they do not correspond to each other, the interrupt program to be executed will be different, and the operation will not be normal. Therefore, when changing the external device connected to the input / output interface (505), the interrupt program corresponding to the external device is stored again in the program memory (2), or the data table storing the start address information of the interrupt program is stored. Need to be rewritten. Further, in order to reset the initial settings, it is necessary to start up again from the system program, and there is a problem that the operation becomes complicated.

Further, the conventional programmable controller peripheral device (600) shown in FIG. 14 requires a user to manually select between a serial printer and a parallel printer, which again complicates the operation. there were. Another problem is that a printer that is not connected is selected by mistake.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and can be changed without re-storing an interrupt program, rewriting a data table, and restarting the system. It is a first object of the present invention to provide a peripheral device of a programmable controller capable of selecting and executing a process corresponding to a selected external device.

It is a second object of the present invention to provide a peripheral device of a programmable controller which can automatically determine a connected printer without a user manually selecting a printer.

[0014]

To SUMMARY OF THE INVENTION The first, peripheral programmable controller of the present invention is determined in the peripheral device can be connected to the Programmer Lama logic controllers, the interrupt factor When an interrupt to the execution processing is requested And execute the interrupt processing corresponding to the interrupt factor and connect according to the type of external device
Whether to include a check signal line or not
An external device having the same type of connector regardless of
I / O interface that can be connected to different types of external devices
And the type of the external device connected to the input / output interface is determined by the connection check signal line when the interrupt processing using the input / output interface as an interrupt factor is executed.
And an execution process switching unit that executes a process corresponding to an external device connected based on the identification result of the identification unit. Second, the peripheral device of the programmable controller of the present invention is
Interruption of ongoing processing in peripheral devices that can be connected
Is requested, the cause of the interrupt is determined and the interrupt
Interrupt processing execution means for executing interrupt processing corresponding to the cause
And a device identification switch according to the type of external device
The switching state of
An external device provided with a connector of the type
I / O interface that can connect external devices
Interrupt processing using the I / O interface as an interrupt factor
When executed, it is connected to the above input / output interface.
Switching of the device identification switch to the device type
Identification means for identifying based on the state;
Perform processing corresponding to the connected external device based on another result.
And an execution process switching means for executing the execution process .

[0015] Thirdly, the programmable controller of the peripheral device of the present invention, there can be simultaneously connected to both the serial printer and parallel printer, the peripheral device can be connected to the programmable controller, flop
Detecting the operating status of the linter by status check
And pulp printer identification means to identify the connection state of the serial printer and parallel printer based on the detection result, only either one based on the serial printer and parallel printer identification result of the printer identification means is connected If it is determined that the printer is in the state, the printout process corresponding to the type of the connected printer is executed, and if both the serial printer and the parallel printer are determined to be in the same connection state (connected or disconnected), use is performed. Printout processing switching means for receiving a user's selection and executing printout processing corresponding to the selection result.

[0016]

In the peripheral device of the first programmable controller, when an interrupt to the processing being executed is requested, the interrupt processing executing means determines the interrupt factor and executes the interrupt processing corresponding to the interrupt factor. Also, the identification means identifies the type of the external device connected to the input / output interface based on the presence or absence of the connection check signal line . Then, based on the identification result, the execution process switching unit automatically selects and executes a process corresponding to the external device. Therefore, it is not necessary to store the interrupt program again, rewrite the data table, and restart the system. In the peripheral device of the second programmable controller, the type of the external device can be identified simply by making the device identification switch ON or OFF for each external device different at the time of connection, so that the configuration is simplified and the cost is reduced. Can be

In the peripheral device of the third programmable controller, the printer identification means includes a status checker.
To determine whether the connected printer is a serial printer or a parallel printer. When the printout process switching means determines that only one of the serial printer and the parallel printer is connected based on the identification result, the printout process switching means executes the printout process corresponding to the type of the connected printer. A possible printer can be automatically selected without error (the user does not have to manually select a printer). Also, if both the serial printer and the parallel printer are determined to be in the same connection state, the user's selection is accepted and the printout processing corresponding to the selection result is executed. Is not recognized properly, the user can select an appropriate printer.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiment shown in FIG.

First, a first embodiment will be described. FIG. 1 is a block diagram showing a peripheral device (100) of a programmable controller according to a first embodiment of the present invention. (1)
Is a CPU, (2) is a program memory composed of a ROM and a RAM, (3) is a work area memory composed of a RAM, (4) is an auxiliary storage device composed of a magnetic disk or the like, and (5) is a An input / output interface for connecting an external device, (5a) is a control signal line connection terminal, (5b) is a power supply line, (5c) is a resistor, and (5d)
Is a check signal line connection terminal, (5e) is a ground line, (7) is a display, (8) is an interface of the display (7), (9) is a keyboard, (10) is an interface of a keyboard (9), (11) is an internal bus, (5)
P) is P for connecting to the programmable controller
C interface. (60) is the external device A, (6)
0a) is a control signal line, and (60b) is a connection check signal line.

The external device A (60) is connected to the input / output interface (5) of the peripheral device (100) of the programmable controller by a connector via a control signal line connection terminal (5a) and a check signal line connection terminal (5d). It is connected. The check signal line connection terminal (5d) is folded back by the connection check signal line (60b) inside the external device A (60).

FIG. 2 shows an input / output interface (5) of the peripheral device (100) of the programmable controller.
9 shows a case where an external device B (61) is connected in place of the external device A (60). The external device B (61) includes an input / output interface (5) of a peripheral device (100) of the programmable controller and a control signal line connection terminal (5a).
And a check signal line connection terminal (5d). Check signal line connection terminal (5
d) is open inside the external device B (61) (61b).

The connectors used to connect the external device A and the external device B have the same shape and the same number of pins, and the external device A and the external device B can be easily switched.

Next, the operation of this embodiment will be described.
FIG. 3 is a flowchart showing processing of the CPU (1) when an interrupt occurs. When an interrupt occurs in step S0, the current program execution pointer value information is saved in step S1. Next, proceeding to step S2, a data table (see FIG. 5) storing the start address information of each interrupt program corresponding to the interrupt cause is searched, and the start address information of the interrupt program corresponding to each interrupt cause is read. The process proceeds to step S3.

In step S3, the read start address information is written into the program execution pointer. further,
In step S400, the program is executed from the address indicated by the program execution pointer. As a result, FIG.
As shown in (1), the processing of the interrupt program according to the interrupt factor is executed. Since the external device A (60) and the external device B (61) are connected to the same input / output interface (5), they cause the same interrupt cause and perform the same interrupt program processing.

When the interrupt program processing ends, the process proceeds to step S5 and returns to the normal processing. As mentioned above,
CPU (1) functions as "interrupt processing execution means"
Having.

FIG. 4 is a flowchart showing the processing of the interrupt program when the interrupt factor is the input / output interface (5). When this interrupt program processing is started in step S401, step S402
To determine the external device connected to the input / output interface (5).

This determination is made as shown in FIGS. 1 and 2 by checking the check signal line connection terminal (5d) pulled up.
Perform according to level. That is, when the check signal line connection terminal (5d) is turned back to the L level on the external device side, the connected external device is connected to the external device A (6).
0), the process proceeds to step S403, and an interrupt program process for the external device A (60) is performed. On the other hand, if the check signal line connection terminal (5d) is open on the external device side and is at the H level, it is determined that the connected external device is the external device B (61), and the process proceeds to step S403. An interrupt program process for the external device B (61) is performed.

Thereafter, the flow shifts to step S405 to execute a return process to the normal process, and ends the interrupt program process in step S406.

When no external device is connected, no interrupt is generated because no interrupt request signal is output.

In the present embodiment, since the configuration is as described above, the external device connected to the input / output interface (5) can be identified and specified. As a result, the interrupt program processing corresponding to the connected external device can be performed. You can do it. That is, the CPU (1) and the input / output interface
The source (5) has a function as “identification means”. Ma
In addition, the CPU (1) serves as “execution processing switching means”.
It has the function of

Next, a second embodiment will be described. FIG. 7 is a block diagram showing a peripheral device (200) of a programmable controller according to a second embodiment of the present invention. In the peripheral device (200) of the programmable controller,
The connection device check signal line (13) connected to the external device identification interface (12) is connected to the resistor (14).
And is connected to one end of the switch (15). The other end of this switch (15)
Connected to ground line.

The switch (1) is artificially connected to the type of the external device (6) connected to the input / output interface (5).
Since the identification signal is input by turning on or off 5), the CPU (1) switches to processing corresponding to the connected external device (6) based on this.

In the first and second embodiments, the external device is identified based on whether the connected device check signal line is at the H level or the L level. However, the external device is identified by a binary code signal of a plurality of digits. You may do so. In this case, a large number of external devices can be replaced.

Next, a third embodiment will be described. FIG. 8 is an external view of a peripheral device (300) of a programmable controller according to a third embodiment of the present invention. (16) is a peripheral device main body of the programmable controller, (17) is a serial printer interface, (18) is a parallel printer interface, (19) is a keyboard, (2)
0) is a mouse, (21) is a display, (22) is a serial printer connected to a serial printer interface (17), and (23) is a parallel printer connected to a parallel printer interface (18).

FIG. 9, FIG. 10 is a flowchart of a printer selection processing in the programmable controller of the peripheral device (300). (24) is a serial printer connection check process, (25) is a parallel printer connection check process, (26) is a serial printer / parallel printer connection status determination process, (27) is a connected printer selection input process, and (28) is a connection side. This is a printer initial process.

[0036] First, the status check of the serial printer in the serial printer connection check processing (24) (step S241), OK state der for determining whether Han
(Step S242). If it is OK,
Set the printer flag (set to “ON”) (step
Step S243), otherwise the serial printer flash
(Step S24)
4). Next, the parallel printer connection check processing (2
5) Check status of parallel printer
(Step S251), to determine the state der determining whether to OK
(Step S252). Parallel if OK
Set the printer flag ("ON") (step S
253), otherwise the parallel printer flag
It is not set (set to "OFF") (step S254).
Next, the state of the printer flag is determined in a serial printer / parallel printer determination process (26).

Serial printer flag and parallel pre
It is determined whether the status of the Internet flag is the same (step S2).
61), perform a process according to the determination result. That is,
When only one of the serial printer flag and the parallel printer flag is set, the initial process (initialization) of the printer on which the flag is set is performed in the connection-side printer initial process (28) (step S281 ). ) . Like this
Serial printer (22) and parallel printer
Since the connection state of (23) can be identified,
The peripheral device body (16) of the controller is
It has a function as “another means”. Also, based on the identification result
To perform initial processing corresponding to the type of printer
From the peripheral device of the programmable controller (1
6) is a "printout process switching means".
Has functions.

[0038] When the when both printers flag is standing when or both printer flag (serial printer, the state of both the parallel printer O K) is not passed (serial printer, both parallel printer NG state), conventionally, The user of the device performs a connected printer selection input process (27) . That is, the user
Is display keyboard (19) while watching the (21) or row physician to select either a serial printer or parallel printer with a mouse (20) (step S271), the selection
A process according to the result is performed (step S272). Syria
If a printer is selected, the serial printer
Lag up (set to “ON”) the parallel printer
(Step S27)
3). When a parallel printer is selected,
Without setting the serial printer flag ("OFF"
), Set the parallel printer flag ("ON"
Yes) (step S274). Then on the selected side
Perform initial processing (initialization) of the printer (step
S281).

Although the printer connection status is checked in the order of the serial printer connection check process and the parallel printer connection check process, the same effect can be obtained even if the order is reversed.

Also, a case has been described where there is one serial printer interface and one parallel printer interface. However, there is a case where there are two serial printer interfaces, two parallel printer interfaces, or a plurality of printer interfaces. However, the same effect can be obtained.

[0041]

According to the peripheral device of the programmable controller of the present invention, the peripheral device can be connected to the outside without the need to change the interrupt program stored in the memory, change the data table, and restart the system program. It is possible to identify the external device and perform the processing corresponding to it correctly.

Further, since it is automatically determined whether the connected printer is a serial printer or a parallel printer, it is not necessary for the user to manually select a new printer every time the connected printer is changed. This has the effect of improving the operation and preventing erroneous operations.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of a peripheral device of a programmable controller according to the present invention.

FIG. 2 is a block diagram showing a first embodiment of a peripheral device of the programmable controller according to the present invention.

FIG. 3 is a flowchart showing processing when an interrupt occurs in the peripheral device of the programmable controller according to the first embodiment of the present invention;

FIG. 4 is a flowchart showing an interrupt program process in the first embodiment of the peripheral device of the programmable controller of the present invention.

FIG. 5 is an exemplary diagram of a data table.

FIG. 6 is a memory map diagram.

FIG. 7 is a block diagram showing a second embodiment of the peripheral device of the programmable controller according to the present invention.

FIG. 8 is an external view showing a third embodiment of the peripheral device of the programmable controller according to the present invention.

FIG. 9 is a flowchart showing a printer selection process in a third embodiment of the peripheral device of the programmable controller according to the present invention.

FIG. 10 is a flowchart showing a printer selection process in a third embodiment of the peripheral device of the programmable controller according to the present invention.

FIG. 11 is a block diagram showing an example of a peripheral device of a conventional programmable controller.

FIG. 12 is a flowchart showing processing when an interrupt occurs in an example of a peripheral device of a conventional programmable controller.

FIG. 13 is a flowchart showing an interrupt program process in an example of a peripheral device of a conventional programmable controller.

FIG. 14 is a configuration diagram showing another example of a peripheral device of a conventional programmable controller.

FIG. 15 is a flowchart showing a printer selection process in another example of the peripheral device of the conventional programmable controller.

[Explanation of symbols]

 Reference Signs List 100 Peripheral device of programmable controller 200 Peripheral device of programmable controller 300 Peripheral device of programmable controller 1 CPU 2 Program memory 3 Work area memory 4 Auxiliary storage device 5 I / O interface 5a Control signal line connection terminal 5b Power supply line 5c Resistance 5d Check Signal line connection terminal 5e Ground line 5P PC interface 60 External device A 60a Control signal line 60b Connection check signal line 61 External device B 61a Control signal line 17 Serial printer interface 18 Parallel printer interface 22 Serial printer 23 Parallel printer

Continuation of the front page (56) References JP-A-61-32157 (JP, A) JP-A-60-14329 (JP, A) JP-A-63-127326 (JP, A) JP-A-1-113445 (JP) , U) (58) Field surveyed (Int. Cl. ⁶ , DB name) G05B 19/05 G05B 19/048

Claims (3)

(57) [Claims] 1. A peripheral device Programmer may be connected to a llama logic controllers, an interrupt execution unit for executing interrupt processing corresponding to the interrupt factor interrupt to determine the interrupt factor when prompted to execute processing , External
Built-in connection check signal line according to the type of device
Or not, and the same type of connector regardless of the type
External device equipped with a
A reconnectable input / output interface and identification for identifying the type of an external device connected to the input / output interface based on the presence or absence of the connection check signal line when an interrupt process is performed using the input / output interface as an interrupt factor. Means for executing a process corresponding to an external device connected based on the identification result of the identification means. 2. A system connected to a programmable controller.
In the peripheral device, an interrupt to the execution processing requests of that may
The interrupt factor is determined and the interrupt factor is handled.
Interrupt processing means for executing interrupt processing
Switch for device identification according to the type of device
The same type of connector regardless of the type
External device equipped with a
Connectable input / output interface and the above input / output interface
Interrupt processing is executed with the interface as the interrupt factor.
Of the external device connected to the input / output interface
The type is based on the switching status of the device identification switch.
Identification means for identifying the
Executing the process corresponding to the external device connected originally
A peripheral device for a programmable controller, comprising: an execution process switching unit . 3. A simultaneously connectable to both the serial printer and parallel printer, the peripheral device can be connected to the programmable controller, printer
Status is detected by a status check and the
And pulp printer identification means to identify the connection state of the serial printer and parallel printer based on the result output, only either one based on the serial printer and parallel printer identification result of the printer identification means is connected If it is determined that the printer is in the state, the printout process corresponding to the type of the connected printer is executed, and if both the serial printer and the parallel printer are determined to be in the same connection state (connected or disconnected), use is performed. A peripheral device for a programmable controller, comprising: a printout process switching means for receiving a selection by a user and executing a printout process corresponding to the selection result.