CONTROL DEVICE MONITORING SYSTEM AND MONITORING METHOD FOR CONTROL DEVICE

• Main Authors: SHIMIZU KATSUHITO, MASHIKO NAOYA, TERAE HISASHI
• Format: Patent
• Language: English
• Published: 15.05.2015
• Subjects: CALCULATING; COMPUTING; COUNTING; ELECTRIC DIGITAL DATA PROCESSING; PHYSICS

The present invention is a PLC monitoring system (10) which monitors the operational state of a plurality of PLCs (1) which control an object to be controlled (5) in order to monitor the operational state of the PLCs (1) wherein the system is characterized in that a PLC (1b) from a PLC (1a) other than itself acquires a control command which has been output from a user program which is being executed at the PLC (1a) and on the basis of the acquired control command generates verification use data. Then the PLC (1b) using the verification use data verifies whether or not the transmission source PLC (1a) for the control command has been infected by a virus or transmits the verification use data to a PC (2) so that by way of the PC (2) displaying the verification use data upon a display device the user performs verification of the infection of the PLC (1a) with the virus.