JPS59226904A - Sequence controller - Google Patents

Abstract

PURPOSE:To increase the generality of a sequence controller by detecting the operation factor of an objective operation factor of the operation mode of the controller itself and sending its contents to a CPU, and decoding and executing corresponding instruction through the CPU. CONSTITUTION:The CPU2 read the storage contents of a user program memory 1 according to addresses sent out through an address bus (a), and controls a mapped input/output device 4 according to the read program. Then, an operation factor detecting circuit 3 detects a factor of the operation sequence in the sequence controller itself such as a power failure and watched timer memory abnormality and reports its contents to the CPU2 through a data bus (b). The CPU2 on receiving them decodes and executes instructions corresponding to the detected operation factor to control the sequence controller itself in operation mode specified by the operation instructions.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical field to which the invention pertains) The present invention relates to a sequence controller that selectively executes various operational specifications of the sequence controller itself apart from the operational relationship between inputs and outputs, and particularly relates to an arbitrary This increases versatility by making it possible to select operational specifications set in a simple process.

(Prior art and its problems) In general, this type of sequence controller is configured to perform sequence operations of a controller that is controlled by a contact or non-contact relay according to a program with operation specifications set by an operator. However, as for the operation specifications of the sequence controller as a whole, in addition to the programming of sequence operations, there are also specifications regarding the operation of the sequence controller itself, as shown in the following example. From this point of view, it is desired to provide similar flexibility by programming sequence operations. The operation of the sequence controller itself is as follows:
Examples include a) operation when a power outage occurs, b) operation when an abnormality occurs, C) synchronization of scan operation with the power supply, and d) setting of operation modes such as operation mode and program mode.

However, in conventional sequence controllers of this type, the operating specifications as described in L are usually set and fixed at the time of manufacture, and it is not possible to arbitrarily select and set these operating specifications during use. It was impossible. In addition, we have created a group of switches that correspond to each of these operating specifications.
Depending on the settings of those switch groups, the operation specifications can be partially set arbitrarily at the time of use! There is also a sequence controller which can be used as a switch, but such a conventional device also has the disadvantage that the setting operations for the switch groups are extremely complicated.

As mentioned above, this conventional persimmon sequence controller has the disadvantage of lacking in versatility, such as lack of flexibility in operation specifications other than so-called sequence operation programming, or complicated operations.

(Object of the Invention) An object of the present invention is to provide a highly versatile sequence controller that eliminates the above-mentioned conventional drawbacks and allows arbitrary desired operation specifications to be set through simple operations during use. .

(Summary of the Invention) In other words, the sequence controller of the present invention has a sequence controller I/roller that decodes and executes a user program indicating input/output operational relationships, and a sequence controller that decodes and executes instructions specifying the operation mode of the sequence controller itself. It is equipped with a means for decoding and executing an instruction to be executed, and a detection means for detecting an operation factor that is a target of this operation mode. When an operation factor is detected, the instruction decoding/execution means decodes and executes the instruction corresponding to the detected operation factor, and controls the sequence controller itself in the operation mode specified by the instruction. It is characterized by this.

(Embodiments of the Invention) The present invention will be described in detail below with reference to the drawings.

First, an example of a schematic configuration of the sequence controller of the present invention is shown in FIG. In the illustrated configuration, 1 is a user program memory, 2 is a central processing unit, 3 is an operating factor detection circuit, and 4 is a Matsubuto input/output device, which are connected to each other via an address/bus a and a data bus b. and
This configuration itself is common to this type of sequence controller. In such a configuration, the central processing unit 2
reads the contents of the user program memory 1 using the address sent via the address bus a, and controls the Matsubuto input/output device 4 according to the read program. Note that as the Matsubuto input/output device 4, an input card, an output card, a user data memory, an abnormality output device, a display device, etc. are used.

Further, the operation factor detection circuit 3 detects factors in the operation sequence within the sequence controller itself, such as power outage, watched timer, memory abnormality, etc., and notifies the central processing unit 2 of the detected contents via the data bus b. Alternatively, it is notified as 1 interrupt signal C.

As mentioned above, the structure of the sequence controller of the present invention can be the conventional general structure shown in FIG.
Furthermore 1. Not limited to the illustrated example, the central processing unit can read the user program and detect the operating factors,
Any configuration can be used as long as the input/output card or other input/output interface can be performed.

Although the structure of the sequence controller of the present invention itself is substantially the same as that of the conventional device, the processing flow and processing program within the device constructed as described above are significantly different from the conventional device. Regarding the apparatus of the present invention and the conventional apparatus, aspects of the processing flow are shown in FIGS. 2 and 3, respectively, and examples of processing programs are shown in FIGS. 4 and 5, respectively. As is clear from the comparison of the illustrated programs, steps 0 to X in the conventional program illustrated in the fourth figure and steps 2 to X in the program according to the present invention illustrated in the fifth figure.
Both X are programs for controlling external controlled devices other than the sequence controller, and both are conventional normal programs, but step 0 and step 1 in the program shown in FIG. 5 according to the present invention are the programs according to the present invention. This is the main point.

Below, when a power outage is detected, there are two options: whether to turn off the output card accompanied by scanning of the operational specifications in the sequence controller, or whether to continue scanning the operational specifications and the output card also continues its operation. The mode of operation of the sequence controller of the present invention will be described with respect to an example in which a choice is made.

In the conventional processing process shown in FIG.
In this case, only one of the two types of operation specifications set and fixed at the time of manufacture was used to execute the process.

On the other hand, in the process according to the present invention shown in FIG. - Determine whether the program is written in the program memory or not. However, when the sequence controller of the present invention is used in a manner that does not require selection or declaration regarding the operation of the sequence controller itself, the F46 instruction is not written in the user program Φ memory, so in such a case, In step S5, processing Z is performed in accordance with the operation specifications set and fixed at the time of manufacture, and in the event of a power outage, the scan is stopped and the fist output card is stopped.

Further, if it is determined in step S2' that the F48 instruction is written in the user program memory, the value of the setting code representing the content of the operation specification selected by that instruction, for example, =O or ni=H plural (n+1)
Steps 54-0 to S4-n
Transition to one of the following. That is, when the setting code is 0, processing A having the same content as processing Z is performed in step 54-0, and when the setting code is 1, scanning is performed as processing B in step 54-1. Continue, output card operation continues. The flow of this process proceeds under the control of the central processing unit 2, and hereinafter, steps 54-2 to 54 are performed according to the setting code =2 to n, respectively.
-1, each of these processing A performs a predetermined processing,
B, . . . , N, and Z are stored as system programs separately from the user program.

As mentioned above, the main point of the present invention is that even the sequence of the internal operation of the sequence controller i-roller itself, which was conventionally thought to be fixed at the time of manufacture, can be made variable using the user program memory. In particular,
In addition, although only the operation at the time of power outage has been described as an example, as can be easily inferred, other operation examples can be similarly programmed, and a few examples will be briefly described.

(a) Power synchronization of scans Immediately after executing the final step of the scan, move to the first step of the next scan, or start the first step of the next scan at the timing when synchronizing with the power supply. Make a choice whether to migrate to The power supply synchronization signal, which is a factor for selecting the operating specifications, is given to the central processing unit 2 by the interrupt signal d from the operating factor detection circuit 3, or mapped, as described above with reference to FIG. The central processing unit 2 can read the data as data, and then perform the same operation as the operation during a power outage described above.

(b) Operation when an abnormal situation occurs When an abnormal situation occurs such as a watched timer timer up, an input/output transfer abnormality, a memory abnormality, etc., selection of stopping, continuing, and holding the scan, and stopping and holding the output state. The cause of the abnormality>If f1 can be reported to the central processing unit 2 by the interrupt signal C from the operation factor detection circuit 3 or as mapping data in the same way as described above, so that the above-mentioned power outage operation can be performed. can work similarly.

(c) Setting of operation modes such as operation mode and program mode In a sequence controller configured to select and set the operation mode and program mode using an external device, the operation mode is set using an external device. If the sequence controller itself is later disconnected from the external device or a power outage occurs, the sequence controller itself will either continue with the operating mode that was set by the external device, or, for example, A selection is made as to whether to shift to a previously set and fixed operation mode, such as by setting the operation mode.

In addition, to select and set the operating mode, the result of mode setting by an external device is stored in the non-volatile memory built into the sequence controller, and the result is stored when the connection with the external device is interrupted or when the power is restored during a power outage. This can be achieved by selecting whether or not to refer to the contents.

Further, in addition to the above-mentioned application example, the present invention can be applied to a first-order case to obtain similar effects.

(d) Definition of power outage, that is, declaration of voltage level and duration of power outage at the time of power outage, etc. (e) Permission or prohibition of program writing in operation mode during operation (f') Volatile/nonvolatile status of built-in timer/counter Selection or Inspection (Effect of the Invention) As is clear from the above explanation, according to the present invention, by adding a command means for selecting and declaring the operation mode of the sequence controller itself to the conventional device, the sequence controller Since a process of branching and determining whether to set the operation mode of the sequence controller itself is added, the operation mode of the sequence controller I/roller itself can be programmed at the time of specification using such instruction means.

Furthermore, if such an operation mode selection/declaration command is not written in the program, a judgment process that can execute a preset and fixed process is stored in the program memory in the sequence controller. Since it is additionally stored in memory, when using an aspect that does not require the selection of such an operation mode, it is not necessary to program the selection declaration command of the operation mode again, and the operation at the time of use is exceptionally simple. The effect of this can be obtained.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an example of a schematic configuration of the sequence controller of the present invention, FIGS.
5 and 5 are diagrams showing examples of processing programs according to the prior art and the present invention, respectively. DESCRIPTION OF SYMBOLS 1... User program, 2... Central processing unit, 3... Operating factor detection circuit, 4... Matsubuto input/output device, a... Address bus, b... Data bus, d...・Interrupt signal. Patent applicant Fuji Electric Manufacturing Co., Ltd. Figure 1 0 Figure 2 Figure 3 1 Figure 1

Claims (1)

[Scope of Claims] 1) A sequence controller configured to decode and execute a user program indicating an operational relationship between turnout and force, comprising: a detection means for detecting an operational factor to be subjected to sequence control; is stored as a user program separately from the user program indicating the operational relationship between the input and output, and when an operational factor is detected by the detection means, the instruction means decodes and decodes an instruction corresponding to the detected operational factor. The sequence controller is characterized in that the sequence controller itself is controlled in an operation mode specified by the command. 2. In the sequence controller according to claim 1, the instruction includes a selection/declaration instruction for selecting/declaring an operation mode, and selection information indicating what kind of selection to make. - If there is no declaration command, a preset operation mode is executed, and if there is a selection meeting declaration command, the process of the operation mode specified by the selection information is executed. sequence controller.