Trlys#F Operation; Trlys1F Contact Arrangement For Tmr Voting - GE Mark VIeS System Manual

6.7.3 TRLYS#F Operation

The 28 V dc power for the terminal board relay coils and logic comes from the three I/O packs connected at JR1, JS1, and
JT1. The same relays are used for ac voltages and dc voltages. The TRLYS#F terminal board uses the same relays with
differing circuits.
Relay drivers are mounted on the TRLYS#F and drive the relays at the frame rate. The relay outputs have a fail-safe feature
that votes to de-energize the corresponding relay when a cable is unplugged or communication with the associated I/O pack is
lost.
This board only supports TMR applications. The relay control signals are routed into TRLYS#F from the three I/O packs, R,
S, and T, through plugs, JR1, JS1, and JT1. These signals directly control the corresponding relay driver for each TMR
section R, S, and T. Power for each section's relay coils comes in from its own I/O pack and is not shared with the other
sections.
TRLYS#F features TMR contact voting. The relay contacts from R, S, and T are combined to form a voted Form A (NO)
contact with TRLYS1F or a Form B (NC) output with TRLYS2F. 24/125 V dc or 115 V ac can be applied. The following
figure illustrates the TMR voting contact circuit.

TRLYS1F Contact Arrangement for TMR Voting

158 GEH-6855_Vol_II GEH-6855_Vol_II Mark VIeS Functional Safety Systems Volume II
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