To file From Jon Hagen Date May22 Aug 21 2002 Subject VERTEX SYSTEM PLC and LCU Replacement Procedures 1 Procedure for Replacing the PLC on the Platform A Test the spare PLC in the digital lab The spare PLC and spare LCU are normally kept in a test rack in the digital lab running the lab test versions of their programs Turn on the monitor if not already on and observe that the spare PLC and LCU are operating properly each should have only its green run light
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