Controlling communication among multiple industrial control systems

A system comprising:

• multiple industrial control systems;
• a network connecting said multiple industrial control systems;
• a communication relay apparatus relaying communication between at least two of said multiple industrial control systems;
• a monitoring section monitoring said multiple industrial control systems;
• and
• a control section switching, if said monitoring section detects anomaly from at least one of said multiple industrial control systems, communication between an industrial control system detected with said anomaly and a second industrial control system so that said communication is performed via said communication relay apparatus.

A communication control method for controlling communication among multiple industrial control systems connected via a network, the communication control method comprising the steps of:

• monitoring multiple industrial control systems;
• relaying communication between at least two of said multiple industrial control systems;
• and
• switching, if an anomaly of at least one of said multiple industrial control systems is detected, communication between an industrial control system detected with said anomaly and a second industrial control system so that said communication is performed via a communication relay apparatus,
• wherein at least one of the steps is carried out by using a computer device.