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SNAP PID Module User’s Guide
5
Attach Input and Output Wiring
1.
(Optional) If you want to use PID setpoint and process variable analog inputs from external
sources with the SNAP PID module, follow the wiring diagram shown on
to connect
PID setpoint inputs to Channel 0 and process variable inputs to Channel 1.
Analog inputs share a common reference and are not isolated from each other.
2.
Connect PID output wiring to the module as shown in the diagram on the following page.
PID output can be 4–20 mA current and 0–10 VDC voltage outputs, both of which share a
common negative terminal. PID output is calculated by the module and then sent
simultaneously to both current and voltage outputs as a percent of output scale. This PID
output can be analog or TPO signals (if TPO is selected, both current and voltage outputs
are switched from 0% to 100%).
