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  • Users: cdevine
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  1. cdevine

    ABB Protection Relay Modbus Communication Problems

    We are having a problem with the loss of modbus communications between ABB protection relays and our ControLogix PLC. We have several (approx 25) 11kV and 3.3kV switchboards comprising ABB protection relays (approx 120 x REF610, 15 x RET541, 15 x REX521). The relays communicate via Modbus RTU...

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