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An ABB TB853 terminator for the AC 800M RCU Control Link, identified by article number 3BSE057022R1. It is listed with TK856 RCU Control Link cable and is used in documented redundancy arrangements such as PM891 packages; it must not be confused with TB852 RCU Link or TB850/TB851 CEX-bus terminators.
Trace the cable and controller endpoints to prove the connection is the RCU Control Link before selecting TB853.
Keep TB853 separate from TB852, TB850 and TB851 by matching article number, connector gender and documented bus role.
After maintenance, confirm both controller paths, synchronization status and communication alarms according to the AC 800M hardware procedure.
Engineering check: Install TB853 3BSE057022R1 only at the end of the RCU Control Link used with TK856 RCU Control Link cable 3BSE057021R1. Confirm connector keying and distinguish it from the TB852 terminates the RCU Link, not the RCU Control Link before energizing the redundant controller pair.
Acceptance test: Check link continuity and termination at both ends, then verify normal RCU Control Link diagnostics. During an authorized test, interrupt one link path and confirm the redundant controllers maintain synchronization and recover without persistent link alarms.