| 摘要 |
PROBLEM TO BE SOLVED: To suppress the occurrence of communication abnormality due to collision when Ethernet communication is used for plant communication control.SOLUTION: A plant communication control device, including communication units 14, 23, 34, n4 and control units 15, 25, 35, n5, interconnects control devices 13, 23, 33, n3 for performing communication control of a plant by a plurality of LAN cables 10 and 12, 22, 32, n2, so as to perform Ethernet (R) communication between the control devices. The communication units 14, 24, 34, n4 detect the number of times of collisions among Ethernet communication. By the instructions of the control units 15, 25, 35, n5 based on the number of times of collisions, the number of retrial times of the Ethernet communication from the control devices 13, 23, 33, n3 is increased or decreased. |
