Patent ID: 11863374
Assignee: HITACHI HIGH-TECH CORPORATION
Field: Measurement (Instruments)
Classification: CPC H  G | IPC G  H

Claim 0:
1. A distributed control system, comprising:
a central computation device;
a central communication device configured to manage communication control;
a plurality of terminal communication devices to which at least one control object device is connected;
a communication path connecting the central communication device and the terminal communication device; and
a display device including at least an LED provided in the terminal communication device and indicating a communication state with the central communication device or the terminal communication device, wherein
the central computation device includes a storage unit retaining correct connection information, and a comparison unit configured to compare the correct connection information with connection information of an actually connected control object device or terminal communication device,
the central communication device includes a central communication control unit configured to control communication of the distributed control system, and a plurality of communication ports,
the terminal communication device includes a terminal communication control unit configured to execute communication control, at least one upstream communication port, at least one downstream communication port, and an individual identifiable ID setting unit,
the central computation device is configured to output, when determination that an error has occurred is made as a result of comparison of the correct connection information retained in the storage unit and the connection information of the actually connected control object device or terminal communication device by the comparison unit, a display signal of an abnormal part to the display device, and
the LED has the same number as that of the upstream communication port and the downstream communication port, and is configured to display the abnormal part on the basis of the display signal such that when the abnormal part is present, a content of the abnormality is identifiable by a lighting mode of the LED.