SYSTÈME DE COMMANDE DE PROCESSUS, APPAREIL DE COMMANDE DE PROCESSUS ET PROCÉDÉ DE MISE À JOUR DE PROGRAMME

摘要

A first process control apparatus in a process control system executes a non-update target program which is not an update target and an update target program which may be the update target, pauses the non-update target program based on a pause request from an outside, and transfers a context of the non-update target program to a second process control apparatus. The second process control apparatus in the process control system executes the non-update target program which is not the update target and an update target program after update, restores a context of the non-update target program by using the transferred context, initializes a context of the update target program, and causes the second program execution unit to resume the non-update target program and the update target program, based on a resuming request from the outside.