PLC SIMULATION SYSTEM, PLC SIMULATOR, RECORDING MEDIUM, AND SIMULATION METHOD

摘要

In a PLC simulation system (10), at least one of a PLC simulator (2) and an external simulator (4) executes processing while checking the status of program execution in the other. For example, the PLC simulator (2) provides a socket interface, and operates upon receiving various commands from the external simulator (4). The external simulator (4) checks, using a command, whether processing for a program is being executed or the execution is finished in the PLC simulator (2). The external simulator (4) checks the status of operation of the program in the PLC simulator (2), and executes processing accompanying writing to a PLC memory (205b) or the like, in a case where contention of access to the PLC memory (205b) does not occur.

主权项

1. A PLC simulation system including a PLC simulator that cyclically repeats processing based on a first cycle, and an external simulator that cyclically repeats processing based on a second cycle, the PLC simulator comprising:
a storage unit for holding data for executing a program, the storage unit being configured to be accessed by the PLC simulator and the external simulator; and a first execution unit for executing a program accompanying processing for inputting and outputting data to and from the storage unit, the external simulator comprising:
a second execution unit for executing a program accompanying processing for inputting and outputting data to and from the storage unit, wherein at least one of the first execution unit and the second execution unit includes a detection unit for detecting that program execution in the other is complete, and the first execution unit or the second execution unit, after executing the program, suppresses execution of a program accompanying access to the storage unit, until the detection is performed.