Distributed control system, control device, control method, and computer program product

A control device to be connected with another control device via a communication network to construct a distributed control system, configured to control a device to be controlled in cooperation with the another control device, the control device comprising:

• a simulator to which a program organization unit is allocated in advance, configured to simulate the allocated program organization unit, the program organization unit constituting part of a control program executed in the distributed control system;
• a shared memory that stores a simulation result of the program organization unit simulated by the simulator to be shared with another control device;
• a simulation table database that stores therein an execution time of each of the program organization units allocated in advance to the control devices, and stores information on an alternative control device for one of the control devices in case of occurrence of a failure;
• and
• a simulation commander that stores, in the simulation table database, the execution time of each of the program organization units corresponding to the simulation result, referring to the shared memory.

A control method to be carried out by a control device connected via a communication network to another control device to construct a distributed control system, the control device comprising a shared memory that stores data to be shared with another control device, and a simulation table database that stores therein an execution time of each of the program organization units allocated in advance to the control devices, the control device that controls a device to be controlled in cooperation with the another control device, the control method comprising:

• simulating an allocated program organization unit, the allocated program organization unit constituting part of a control program executed in the distributed control system;
• storing a result of the simulation of the program organization unit in the shared memory to be shared with the another control device;
• and
• storing, in the simulation table database, an execution time of each of the program organization units corresponding to the simulation result, referring to the shared memory.

A computer program product including programmed instructions embodied in and stored on a non-transitory computer readable medium, wherein the instructions, when executed by a computer to control a control device connected via a communication network to another control device to construct a distributed control system, the control device comprising a shared memory that stores data to be shared with another control device, and a simulation table database that stores therein an execution time of each of the program organization units allocated in advance to the control devices, the control device that controls a device to be controlled in cooperation with the another control device, cause the computer to perform:

• simulating an allocated program organization unit, the allocated program organization unit constituting part of a control program executed in the distributed control system;
• storing a result of the simulation of the program organization unit in the shared memory to be shared with the another control device;
• and
• storing, in the simulation table database, an execution time of each of the program organization units corresponding to the simulation result, referring to the shared memory.