Rockwell Automation 1771-PD PID MODULE (+DU) - Manual (Page 33)

Assembly and Installation
Chapter 2
2Ć20
+15V dc Analog Supply
When both the module outputs and tieback inputs (if used) are configured
in current mode, additional compliance can be selected. As such, module
common is internally connected to -15V dc. The +15V dc analog power
supply can provide a 30 V dc source to the input current loop by
jumpering the +15V Dc terminal of the PID module to the positive lead of
the current transmitter (Figure 2.10). The potential of 30 V dc is enough
to provide the required voltage drops for the transmitter, PID module, and
manual control station.