JPH03246602A - Programmable controller - Google Patents

Abstract

PURPOSE:To exactly monitor operation at each point of the execution processes of a program by storing the execution result of a required step in the execution processes of the program in a storage part. CONSTITUTION:A step for writing an output result in a data storage part 3 is inserted into the post stage of a step requiring the monitoring of its output in a program stored in a program storage part 1 and the execution result of the step is stored in a monitoring area allocated for monitoring in a data storage part 3. When the monitoring area of the storage part 3 is referred from the external through a communication port formed in an I/O part 4 after the end of one scanning, an output state in each point of time can be known. Thus, operation at each point of the execution processes of the program can be exactly monitored.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a programmable controller.

[Conventional technology]

Generally, in this kind of programmable controller, 1
The execution results are monitored after the scan is completed.

[Problem to be solved by the invention]

In the conventional programmable controller, when a program as shown in FIG. 6 is executed, the following problem occurs. That is, in the A stage, when the input xO is turned on, the output YIO is turned on, and in the B stage, when the input XO is turned on, the output Y10 is turned off. Therefore, in the conventional configuration in which the execution result is monitored after the completion of one scan, the output YIO of the above program is
You will get the result that the is turned off. That is,
In the A stage, when the input xO is turned on, the output Y10
Even though the output Y10 is turned on, a monitoring result will be obtained as if the output Y10 was turned off, and the actual execution process and the monitoring result will not match. The present invention aims to solve the above-mentioned problems, and provides a programmable controller that monitors the execution process so that the intermediate progress of the execution state can be grasped, and the execution process and the monitoring results are made to match. This is what we are trying to provide.

[Means to solve the problem]

In the configuration of claim 1, in order to achieve the above object, there is provided a programmable controller comprising a program storage section storing a program, an arithmetic unit executing control according to the program, and a data storage section storing data related to the execution state. In this method, a step is inserted to store the execution result in a predetermined area of the data storage section next to the step that requires monitoring. In the structure of claim 2, a monitoring storage unit stores an address in a program storage unit of a step to be monitored;
An address matching determination section is added that stores the execution result in a predetermined area of the monitoring storage section when the address at which the program is being executed matches the address stored in the monitoring storage section. In the configuration of claim 3, a monitoring storage section is added that stores data read from the data storage section immediately after execution of each step.

[Effect]

According to the above configuration, in either configuration, the execution results of the required steps in the program execution process are stored in the storage unit, so after one scan is completed, the execution results stored in the storage unit are stored in the storage unit. By referring to it, you can accurately monitor the operation at each point in the program execution process.

[Embodiment 1] As shown in FIG. 1, a programmable controller basically includes a program storage unit 1 in which programs (including a system) are stored, an arithmetic unit 2 that executes the programs, and a computer that executes the programs. a data storage unit 3 that stores the data necessary for the process, or the status of execution or intermediate results of calculations;
As shown in FIG. 2, this embodiment is equipped with an input/output unit 4 for connecting controlled equipment, etc., and is configured to perform a program storing a program stored in the program storage unit 1 that requires output monitoring. After this step, steps So and SL for writing the output result into the data storage section 3 are inserted. The results obtained when steps SO and SL are executed are stored in a monitoring area allocated for monitoring within the data storage unit 3. In this way, during the program execution process during one scan, the execution results of necessary parts are stored in the data storage unit 3, so that after the completion of one scan, the execution results are transmitted via the communication port provided in the input/output unit 4. By referring to the monitoring area in the data storage section 3 from the outside, it is possible to know the state of the output Y10 at each point in time. As mentioned above, the execution process is monitored by adding steps SO and SL that write the result of output Y10 to the data storage unit 3, so there is no effect on the operation of the controlled equipment. . However, if it is inconvenient to give the user the impression that the program has a different operation due to the addition of steps SO and SL, even though there is no change in the operation, the program storage An area that cannot be referenced by the user is provided in part 1, or a storage section that cannot be referenced by the user is provided separately.
Steps So and Sl may be added to that portion.

Embodiment 2 In this embodiment, as shown in FIG. 3, a monitor storage section 5 and an address match determination section 6 are added to the basic configuration. The monitor storage unit 5 stores in advance the address within the program storage unit 1 of the position of the step to be monitored. When the execution of the program is started, the arithmetic unit 2 sequentially increments the addresses in the program storage section 1, reads out the program, and continues execution. During the program execution process, the address-matching unit 6 monitors whether the address being executed in the program storage unit 1 and the address stored in the monitor storage unit 5 match, and if the two addresses match, the address A coincidence signal is output from the coincidence determination section 6. When the arithmetic unit 2 receives the coincidence signal, the output at that time is stored in the monitor storage unit 5. This operation continues until one scan is completed. Through the above operations, the monitoring results of the required locations are stored in the monitor storage unit at the end of one scan.
By referring to the contents of the monitor storage unit 5, the operation of the execution process can be monitored. Here, the monitor storage unit 5
Since the address of the location that requires monitoring is stored in , it is sufficient to set an area for storing the monitoring results corresponding to this address. Further, since the address matching determination unit 6 can be realized by software without providing additional hardware, it may be incorporated as a system program.

Embodiment 3 As shown in FIG. 4, this embodiment differs from the basic configuration in that a monitor storage section 5 is added. The monitor storage unit 5 is provided to store monitoring results, and the execution process is monitored as follows. That is, in this embodiment, the program execution procedure includes a procedure for monitoring the execution process, and in each step, immediately after the instructions are successively issued, decoded, and executed, data is stored from the data storage unit 3. The data corresponding to the command is read out, and then the read data is stored in the area corresponding to the command in the monitor storage section 5. This execution procedure is repeated, and data corresponding to each step is stored in the corresponding address of the monitor storage unit 5. For example, in the program shown in Figure 5, Ajizu, r
STRT After reading the XOJ, decoding and executing the instruction (reading the XO), read the data corresponding to the XO from the data storage unit 3. Next, read the data to the address corresponding to this instruction in the monitor storage unit 5. Store the data and move to the next step
is read out. According to the above operation, after one scan is completed, data corresponding to the entire execution process will be stored in the monitor storage unit 5, but if the contents of the monitor storage unit 5 are referred to, the data corresponding to the entire execution process will be stored in the monitor storage unit 5. This allows you to accurately understand the process.

【Effect of the invention】

As described above, in the present invention, the execution results of required steps in the program execution process are stored in the storage unit, so that after one scan is completed, the execution results stored in the storage unit can be referred to. , it has the advantage of being able to accurately monitor the operation at each point in the program execution process.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the basic configuration of a programmable controller according to the present invention, FIG. 2 is a schematic configuration diagram showing a first embodiment of the present invention, and FIG. 3 is a block diagram showing a second embodiment of the present invention. 4 is a block diagram showing Embodiment 3 of the present invention,
FIG. 5 is an explanatory diagram of the operation of an example of the execution program in the above, and FIG. 6 is an explanatory diagram of the conventional problem. 1...Program storage unit, 2...Arithmetic unit! , 3...
- Data storage section, 4... Input/output section, 5... Monitoring storage section, 6... Address match determination section.

Claims (3)

[Claims] (1) In a programmable controller equipped with a program storage unit that stores a program, an arithmetic unit that executes control according to the program, and a data storage unit that stores data related to the execution state, data storage is performed next to a step that requires monitoring. 1. A programmable controller, characterized in that a step is inserted for storing an execution result in a predetermined area of a programmable controller. (2) In a programmable controller equipped with a program storage unit that stores a program, an arithmetic unit that executes control according to the program, and a data storage unit that stores data related to the execution state, the steps to be monitored are stored in the program storage unit. A monitor memory unit that stores addresses and an address match determination unit that stores the execution result in a predetermined area of the monitor memory unit when the address at which the program is being executed matches the address stored in the monitor memory unit are added. A programmable controller characterized by comprising: (3) In a programmable controller equipped with a program storage section that stores a program, an arithmetic unit that executes control according to the program, and a data storage section that stores data related to the execution state, immediately after execution of each step, the data storage section A programmable controller characterized in that a monitor storage section for storing read data is added.