The optional communication modules provide one or two serial communication
interfaces for the integration of the protection and control unit into a substation
control system.
The local control module L is located behind the front panel and connected to the
processor module via a ribbon cable. It encompasses all control and display
elements as well as a PC interface for running the operating program S1.
P634 3 Operation
3-2 P634/EN M/R-42-A // P634‑311‑653
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