Unitronics EX-D16A3-RO8 Installation Manual page 4

Connecting RG Pins
For correct operation of digital and analog inputs and for EMI immunity, connect the RG pin of all the expansion modules
containing RG signals to the adapter module 0V signal.
The overall length of the wire connecting the RG pins to the adapter 0V signal must be less than 3 meters.
Connect the RG pins in series (daisy chain). To facilitate this, use both the RG pins.
Wiring Outputs
The following diagram shows the output connector with pin numbers and corresponding output numbers.
Wiring the Output Power Supply
A non-isolated power supply can be used provided that the 0V signal is connected to the earth ground.
Do not connect the neutral or line signal of the 110/220VAC to the device's 0V pin.
In the event of voltage fluctuations or non-conformity to voltage power supply specifications, connect the device to a regulated
power supply.
Wiring Relay Outputs
Increasing Contact Life Span
To increase the life span of the relay contacts and protect against potential damage by reverse EMF, connect one of the following:
A clamping diode in parallel with each inductive DC load.
An RC snubber circuit in parallel with each inductive AC load.
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