JPH01204104A - Programmable controller - Google Patents

Abstract

PURPOSE:To realize a quick debugging process of a sequence program by using a memory which stores the control elements forming a sequence program and the addresses and symbol instructions of said control elements and a means which reads out the memory information corresponding to the input control element. CONSTITUTION:The memories 3 and 4 store the control elements forming a sequence program and the addresses and symbol instructions of those control elements respectively. An input device 5 is added to supply the control elements together with an arithmetic control part which reads the memory information corresponding to those control elements out of both memories 3 and 4. These control elements are supplied before execution of the sequence program. Then the information corresponding to the input control element is read out of the memory and outputted to a printer, a display, etc. These output contents are checked for detection of the program abnormality. As a result, a debugging process of the sequence program is carried out easily and quickly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a programmable controller, and more specifically, it proposes a programmable controller that enables debugging of sequence programs.

[Prior art]

The sequence program to be executed by the programmable controller is created by drawing a ladder diagram and including symbol commands such as normally open contact, normally closed contact, open, short circuit, output coil, etc. as shown in Figure 5, as well as external input (X), external output ( Y), timer (
It is created by inputting the type command of control elements such as T) and internal relay (R) and the addresses of these control elements.

The program input in this way is converted into executable machine language and stored in memory, and has an instruction system in which the components of the ladder diagram and the machine language have a 1:1 correspondence. Japanese Unexamined Patent Application Publication No. 1983 (1986) as a debugging method for sequence programs in programmable controllers
The method of No.-183705 is known. This is a method in which, if there is a trace instruction, after output processing, arithmetic trace processing is performed when the instruction is on or changing from on to off to detect necessary information.

[Problem to be solved by the invention]

However, if the creator or inputter of the sequence program makes a mistake in the address of the control element or does not correspond to the contact input and the output coil, tracing processing will not be performed, and it will take time to investigate the cause.

FIG. 6 shows an example of a ladder diagram S R1 I Rz.

After the external output coil Y at step Y, (A)
Even if a trace command is provided in (b), unless the contact R2 in (b) is manually turned on, tracing will not take place, and therefore the information before and after the command cannot be correctly known.

The present invention has been made in view of the above circumstances, and it provides input information for a sequence program in a special memory, reads this information before executing the sequence program, and debugs the sequence program based on this information. An object of the present invention is to provide a programmable controller that can easily and quickly perform the following steps.

[Means to solve the problem]

Such a programmable controller according to the present invention includes a memory for storing control elements constituting a sequence program, their addresses, and symbol instructions, a means for inputting the control elements, and storage information corresponding to the input control elements in the memory. The invention is characterized in that it comprises means for reading from.

[Effect]

Input control elements prior to execution of the sequence program. Then, information corresponding to the input control element is read out from the memory and output to, for example, a printer or a display. Program abnormalities can be detected by examining this output content.

〔Example〕

The present invention will be described in detail below based on drawings showing embodiments thereof.

FIG. 1 is a block diagram schematically showing the configuration of the programmable controller of the present invention. In the figure, reference numeral 5 denotes an input device, which consists of a numeric keypad, keys corresponding to the symbol commands of the ladder diagram, etc. The program input by the operation is inputted to the arithmetic control unit 1 via the interface 2, where the ladder diagram It is converted into executable machine language that corresponds 1:1 with the components in the diagram. This machine language is stored in the first memo 'J3.

On the other hand, in the programmable controller of the present invention, addresses and symbol commands of input sequence programs are stored in the second memory 4 for each type of control element.

In addition to writing into the memories 3 and 4, the arithmetic control unit 1 reads stored information from the memory 3 for executing a sequence program, and also displays it on an output device W6 such as a display or printer connected to the interface 2. The stored information is read from the memory 4.

The input device 5 is provided with a key for instructing to read the information stored in the second memory 4.

Next, the operation of the programmable controller of the present invention will be explained using the ladder diagram shown in FIG. 2 as an example. This ladder diagram shows a series circuit of Xl and R3, a series circuit of R1, Rz and Yl, a series circuit of X2 and R1, a series circuit of X3 . R
,. and Ylo series circuits are connected in parallel.

FIG. 3 is a mnemonic representation of this ladder diagram for each step.

When a control element is input from the input device 5 by performing a predetermined operation prior to execution of the sequence program, the arithmetic control unit 1 reads stored information related to the input control element from the second memory and sends it to the output device 6. Display. FIG. 4 shows an example of this, and when the internal relay R is input, the address, contact input, and output coil are displayed in correspondence. Here, "1" indicates that it is used, and "0" indicates that it is not used.

This allows the operator to immediately discover errors in the sequence program. In other words, for address 1, both the contact input and output coil are 1 (Figure 2 (c),
(See (d)) and is correct.

Address 2 is an error because it is only a contact input (Fig. 2 (E)) and does not use an output coil.

The same error occurs for address 10.11-.

This makes the input contact R1 corresponding to the output coil of R11
It was discovered that 1 was incorrectly entered as RIG.

- In the above-mentioned embodiment, only the contents of the second memory are displayed on the output device 6, but the arithmetic control unit 1 determines, for example, an address that does not match the contact input and the output coil, and displays this as well. In this case, abnormality detection may be automatically performed.

〔effect〕

With the apparatus of the present invention as described above, an abnormality in a sequence program or an error in a logic circuit can be easily and quickly discovered, and the work performed when a programmable controller is sent is greatly simplified.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the main part of the programmable controller of the present invention, Fig. 2 is a ladder diagram for explaining its operation,
Fig. 3 is a two-monisoku expression diagram, Fig. 4 is an explanatory diagram showing an example of the display of the output device, Fig. 5 is a symbol command diagram of the constituent elements of the ladder diagram, and Fig. 6 is a ladder diagram showing the problems of the conventional method. It is a diagram. 1... Arithmetic control unit 3... First memory 4... Second memory 5... Input device 6... Output device Applicant Sanyo Electric Co., Ltd. Agent Patent attorney Noboru Kono Mistake 1 Figure Internal Relay R Figure 4 Figure 5 Figure 6 Figure 6

Claims (1)

[Claims] 1. A memory for storing control elements constituting a sequence program, their addresses, and symbol commands, means for inputting the control elements, and means for reading stored information corresponding to the inputted control elements from the memory. A programmable controller characterized by: