CHAPTER 3: INSTALLATION DIRECT INPUT AND OUTPUT COMMUNICATIONSM60 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL 3-353Figure 3-33: Direct input and output dual-channel connectionThe following diagram shows the connection for three UR-series relays using two independent communication channels.UR1 and UR3 have single type 7 communication modules; UR2 has a dual-channel module. The two communicationchannels can be of different types, depending on the type 7 modules used. To allow the direct input and output data tocross-over from channel 1 to channel 2 on UR2, set the DIRECT I/O CHANNEL CROSSOVER setting to “Enabled” on UR2. Thisforces UR2 to forward messages received on Rx1 out Tx2, and messages received on Rx2 out Tx1.Figure 3-34: Direct input and output single/dual channel combination connectionThe inter-relay communications modules are available with several interfaces and some are outlined here in more detail.Those that apply depend on options purchased. The options are outlined in the Inter-Relay Communications section of theOrder Code tables in Chapter 2. All of the fiber modules use ST type connectors.
