JPH02151903A - Monitor device for programmable controller - Google Patents

Abstract

PURPOSE:To efficiently test a sequence program by displaying the formation or unformation of a condition for a master control instruction relating to the sequence program. CONSTITUTION:At the time of starting operation, a programmable controller 1 outputs a prescribed output signal in each formation of a condition by referring an I/O output signal from an I/O memory 18 based on a programmed sequence program stored in a memory 14. At that time, monitor display information such as an I/O signal state is sent to a loader device 2 through a loader interface 16. The formation/unformation of a condition for a master control information relating to a certain point of the sequence program is displayed together with the monitor display of the point. Consequently, a program test can be efficiently executed even in case of a sequence program divided into respective processing units.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a programmable controller monitor device that can efficiently test a created sequence program.

B9 Summary of the Invention The present invention provides a monitor device for a programmable controller that can program a predetermined range of sequence programs using a master control command as an AND condition. This system is equipped with a means for displaying whether the conditions of the related master control commands mentioned above are satisfied or not, and makes it easy to understand the cause of failure of the conditions of the sequence program, thereby making it possible to test the sequence program efficiently. be.

C3 Prior Art Conventionally, when performing sequence control in which a certain control is performed when a certain condition is met, programmable controllers that can be used to program a sequence program for the purpose have been widely used. Some of these conventional programmable controllers can be programmed in units of processing using master control commands when a certain condition or a certain control becomes a large program.

FIG. 6 is a program diagram showing an example of conventional programming. The master control command consists of a master control set command MC8 and a master control reset command MCR, and a master control set command MC3.
The condition S1 immediately before is applied as an AND condition to all sequence programs from below to the master control reset command MCR. These master control commands MC8 and MCR can be nested to include other master control commands within the program range as an AND condition, making it possible to program the sequence program in units of processing. . In addition, the programmable controller is generally equipped with a monitor device that also serves as a loader device, so that a specific point in the sequence program can be designated and displayed on the monitor during program testing.

D5 Problem to be Solved by the Invention 3 - However, in the programmable controller monitor device in the above-mentioned conventional technology, when a specific point of a sequence program is specified and displayed on the monitor during program testing, the sequence program is Since the status of the master control command is not displayed as an AND condition, there is a problem in that it is difficult to understand the cause of failure of the condition in the sequence program. To explain this with reference to FIG. 6, for example, if the program at point A is only monitored and B is not output even though condition S2 is satisfied, then whether the condition of the related master control command is satisfied or not is determined. If you are not aware of the failure, there is a risk of making the wrong decision.

Also, if master control instructions are nested, it is not possible to understand the cause of a condition not being met by monitoring only that program; instead, monitor other related programs by referring to the program diagram. There arises a need to do so.

The present invention was devised to solve the above problems, and an object of the present invention is to provide a programmable controller monitor device that can efficiently test programs using master control instructions. do.

E7 Means for Solving the Problems The programmable computer of the present invention to achieve the above object.
The configuration of the controller monitor device is such that the programmable controller monitor device can program a predetermined range of sequence programs using a master control command as an AND condition. The present invention is characterized by comprising means for displaying whether a condition of the master control command (2) related to the master control command is met or not.

F. Effect The present invention provides a method for testing a sequence program in which a master control instruction is used or is nested with a plurality of master control instructions, by monitoring and displaying whether a condition of a master control instruction regarding a certain point in the sequence program is met or not. By displaying this information together with the information, it becomes easy to understand the cause of failure of the sequence program condition.

G. EXAMPLES Hereinafter, examples of the present invention will be described in detail based on the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. 1
is a programmable controller and includes a loader device 2 for programming. This loader device 2 also serves as a monitor device during program testing.

The programmable controller l consists of a computer system. II is the CPU, +2 is its pass line, 1
3 is a ROM (
14 is a memory for registering sequence programs manually input from the loader device 2, and +5 is a working RA for placing work areas for various programs.
M (random access memory), 16 is a loader interface for inputting and outputting with the loader device 2, 17 is an input/output circuit that inputs input signals from the outside and outputs control output signals based on sequence control to the outside, 18 is an I10 memory for storing its input signals and control output signals. With the above configuration, when the programmable controller starts operating, it refers to the input/output signals in the I10 memory 8 and outputs a predetermined output signal every time a condition is met based on the programmed Noken program in the memory 4. I'm going to go. At this time, monitor display information such as input/output signal status is sent to the loader device 2 via the loader interface 16.

This programmable controller can use the master control instructions (MC9, MCR) mentioned above,
And nesting is also possible.

The loader device 2 is also constituted by a computer system. 21
22 is the CPU, 22 is its pass line, 23 is a key input unit for performing necessary input operations during programming and monitor display, and 24 is a CRT for performing monitor display, etc.
25 is a ROM for storing a program for programming or a program for displaying a monitor in this embodiment, 26 is a RAM for storing a work area for these programs, and 27 is a display for storing a programmable controller. It is an interface. The interface 27 is connected to the loader interface 16 of the aforementioned programmable controller. With the above configuration, the loader device 2 allows programming to be performed on the programmable controller, and monitors the operating state on the display 24 when the programmable controller executes sequence control. This monitor display indicates a certain point in the sequence program, and if there is a master control command related to the sequence program at that point, it also displays whether the condition is met or not. In that case, if the master control command is nested in a plurality of master control commands, the nesting level of each master control command and whether the conditions at that level are met or not are displayed. In this embodiment, the functional means for displaying these monitors is the ROM 25.
This is accomplished by the procedures stored in .

FIG. 2 is a flowchart showing the procedure of monitor display in this embodiment. When the start of monitor display for a certain point in the sequence program is instructed, first, monitor display information is input from the programmable controller I side. From this monitor display information, the software determines whether the conditions of MC8 are satisfied or not and whether the conditions of MC3 are satisfied or not at the nest level for all master control set commands MC9.
information regarding the address is created in the RAM 26. Third
The figure shows an example of the structure of a table of information regarding the satisfaction/non-fulfillment of conditions of master control commands created according to the above. Next, the display 24 displays whether the condition is met or not met at a certain point in the specified NOKEN program based on the monitor display information in item 1. If it exists, the level of MC8 and whether the condition of MC8 is satisfied/unsatisfied are simultaneously displayed in addition to the monitor display, and the process ends. If there is no master control set command related to that point, the display may be ended as is. Indication of whether a condition is met or not met on the monitor display is performed by changing the brightness of symbols such as relay contacts and coils, or by performing reverse (inversion) display.

The operation of the embodiment configured as above will be described.

FIG. 4 is a sequence program diagram for explaining the operation of this embodiment, and FIG. 5 is
FIG. 7 is a diagram showing an example of a monitor display screen when a point is indicated and a range of Y is displayed on the monitor.

In FIG. 4, for the sequence program in the range Y, condition R3 of MC8 at program address 30 is applied as an AND condition;
is nested in condition R2, and further program address 1
It is nested in the condition R of 0. Therefore, if the program condition at point X is R4, the condition actually output to point Z is the AND of the conditions R+, R2, R3, and R4. For this reason, if only the X point is monitored as in the conventional monitor display, only the condition of R4 can be known, and it is not possible to know whether the condition of the Z point is satisfied. Therefore, in this embodiment, as shown in FIG. 5, in addition to the monitor display of the sequence program in the range of Y under the intention of The address is displayed and whether the condition of the MC8 is satisfied or not is displayed (for example, a display of 1. 0 if the condition is met). Further, the level of the nested MC8 is displayed at the left end of each sequence program, so that it can be seen at a glance which master control instruction the sequence program is nested in. As a result, there is no need to be aware of the master control level during program testing, and the level can be understood without looking at the program drawing.
In addition, when a condition is not satisfied in a nested program, the program that is the cause of the failure can be quickly identified by the condition fulfillment/unfulfillment status at each level of the MC8.

Although the present invention has been described with an example in which the monitor device is configured separately from the programmable controller, it is of course possible to configure a computer system in which the monitor device and the programmable controller are integrated. As described above, the present invention can be applied in various ways and can take various embodiments in accordance with its gist.

As is clear from the explanation in Section I (Advantages of the Invention), according to the programmable controller monitor device of the present invention, even sequence programs divided into processing units can be efficiently tested. .

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a flowchart showing the monitor display procedure of this embodiment, FIG. 3 is a diagram showing an example of a table structure of information regarding master control commands, and FIG. 5 is a diagram showing an example of a monitor display screen, and FIG. 6 is a program diagram showing an example of conventional programming. ■...Programmable controller, 2...Loader device (monitor device), 21...CPU, 24...Display, 25...ROM, 26...RAM 0 and 2 people Figure 1 Issho/Direction Ita 11 Flowchart 71 Program 0 Programming System, Controller Figure 2 Flowchart for pulling the load level 1 C5) -- level △ level 2 one + toe hook C3) -- level 3 MCR) -- level 3 MC5's MCR cR) -- level 2's MC5's MCR

Claims (1)

[Claims] (1) In a monitor device for a programmable controller that can program a predetermined range of sequence programs using master control commands as AND conditions, in addition to the monitor display of the above sequence program, the display section displays the above master control related to the sequence program. A monitor device for a programmable controller, comprising means for displaying whether a condition of an instruction is met or not.