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Rockwell Automation Publication 1444-UM001D-EN-P - June 2018 209
Configure Relays Chapter 7
Double-pole, Double-throw (DPDT) Relay Solutions
All 1444 Series module and expansion module relays are identical single-pole,
double-throw (SPDT) type as in
Figure 84 . When a double-pole, double-
throw (DPDT) relay is required it is possible to combine two SPDTs to act as a
DPDT.
Figure 84 - Single-pole and Double-throw Relays
Each single-pole, double-throw relay includes one input pin (common) and
individual pin connections for the normally open and normally closed
positions of the relay.
Each double-pole, double-throw relay includes two common pins
(connections) and, for each, independent connections for the normally open
and normally closed positions of the poles.
The 1444 series supports DPDT relay solutions by use of two identically
configured standard SPDT relays. Each SPDT relay that is used in a DPDT
solution can be on the same or different expansion relay module but exclude
the SPDT on the main module (1444-DYN04-01RA). That relay includes
(slightly) different functionality than the expansion module relays.
Single-Pole, Double-Throw (SPDT) Relay Double-Pole, Double-Throw (DPDT) Relay