Product specifications

Appendix A Hardware Units CI854/CI854A and TP854 – PROFIBUS DP Interface
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The CI854/CI854A expansion unit contains the CEX-Bus logic, the CPU-kernel
with memory, the PROFIBUS interface with line redundancy unit and a DC/DC
converter that supplies the appropriate voltages from the +24V supply, via the CEX-
Bus.
The PROFIBUS DP must always be terminated at the two outer nodes. This is
usually done by using connectors with built-in termination. To guarantee a correct
working termination the connector has to be plugged and power supplied.
The PROFIBUS DP requirements for screening/earthing have to be fulfilled. The
PROFIBUS DP installation guideline requires that the cable shield should be
connected to ground at both ends of the cable. This has to be done although the
CI854/CI854A already connects the shield to ground via the connectors.