Unitronics Uni-I/O UIS-WCB1, Руководство по установке

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UIS-WCB1 Installation Guide
10 Unitronics
3-wire and 2-wire 4-wire
Wiring the Relay Outputs

To avoid risk of fire or property damage, always use a limited current source or
connect a current limiting device in series with the relay contacts.
All 8 relay outputs share
the common point CM5.
Increasing contact life span
To increase the life span of the relay contacts and protect the module from potential
damage by reverse EMF, connect:

a clamping diode in parallel with each inductive DC load.

an RC snubber circuit in parallel with each inductive AC load.
DC Load AC Load