6.5.3.2 Simplex
Relay drivers, fuses, and jumpers are mounted on the TRLYS1B. For simplex operation, D-type connectors carry control
signals and monitor feedback voltages between the I/O pack and TRLYS1B through JA1.
Relays are driven at the frame rate and have a 3.0 A ac rating. The typical time to operate is 10 ms. Relays 1-6 have a 250 V
metal oxide varistor (MOV) for transient suppression between Normally Open (NO) and the power return terminals. The
relay outputs have a fail-safe feature that vote to de-energize the corresponding relay when a cable is unplugged or
communication with the associated I/O pack is lost.
TRLYS1B Circuits, Simplex System
YDOA Discrete Output Modules GEH-6855_Vol_II System Guide 147
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