DCS Communication Network Sample Clauses

DCS Communication Network. The Plant's DCS communication network shall consist of a single redundant data-highway loop, to which the DCS shall be connected. DCS shall be connected to the redundant data-highway loops with redundant communication hardware. The communication hardware shall have automatic loop transfer capability to provide protection against a single loop failure. Loss of either data-highway loop shall be alarmed. The data-highway shall permit all devices in each system to interface with one another. No single equipment failure shall interrupt communications between subsystems. Individual points shall be scanned, system communications completed, and control signal outputs updated at least once every 1/3 second. All data on CRT displays shall be updated at least once every second. CRT graphics displays shall be fully displayed with all current live data within 2 seconds after the request for the display has been initiated.