Multifunction Protection and Switchgear Control Unit, model REF542plus Operator’s Manual 17 Appendix A: Connection diagrams The pictures below show the connections plate for REF542plus both in the wide and standard housing versions. The wide housing version can house three binary input and output modules, the communication module and, the analogue output module or alternatively the analogue 4-20mA input module. The standard housing version can house at most two binary input and output modules and alternatively the communication or the analogue output module. The connectors meaning is explained in the following. Warning! Do not operate a switchgear unless the REF52plus connections are properly done, verified by an expert electrician and tighten. - + Figure 43: REF542plus wide housing connections plate with mixed analogue input connector. 1VTA100172-Rev 4, en Valid for version V4D02 PTMV, 04.04.2005 45 / 77