CONTROL SYSTEM AND CPU UNIT

• Main Authors: SHIMIZU KATSUTO, SASAKI WATARU, TAHARA YUKIKO, ONOZUKA AKIHIRO, KOBAYASHI EIJI, NAKANO AKIHIRO, SEKI YUSUKE, OTSUKA YUSAKU, ISHIKAWA MASAKAZU
• Format: Patent
• Language: English
• Published: 09.06.2011
• Subjects: CONTROL OR REGULATING SYSTEMS IN GENERAL; CONTROLLING; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS ORELEMENTS; PHYSICS; REGULATING; SELECTING

PROBLEM TO BE SOLVED: To provide a communication device and a control system improving availability and allowing identification of a line anomaly position. SOLUTION: A plant control system forms a loop of 1-system line and a 2-system line, between which data frame transfer directions are reverse to each other, between a main-system CPU unit and respective RIO units. To the RIO units connected to the main-system CPU unit, a subsystem CPU unit is also connected by using a reflection electrooptical converter. The directions of the 1-system loop and the 2-system loop formed between the subsystem CPU unit and the respective RIO units are reserver to the direction of the loop between the main-system CPU unit and the respective RIO units. When a network of the plant control system is formed in this way, high fault tolerance is achieved against line faults occurring in one place intensively, and robust availability is provided. When a flag register and a timer for verifying whether the data frame arrives within a prescribed time are arranged in the CPU unit, the fault positions are surely identified or estimated. COPYRIGHT: (C)2011,JPO&INPIT