Problem: When sharing one Process Variable (PV) with multiple systems, the connection needs to be thought out carefully. Creating a series connection for the 4-20mA signal is not a best practice for sharing the PV, see Figure 1. The main problem in creating a series connection is when either the DCS or the PLC input is disconnected, intentionally or by accident, both the DCS and the PLC will lose the PV signal.
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Topics: Moore Industries, Analog Isolation