6.8 SRLYS2A Simplex Relay Output
The Simplex Relay Output (SRLY) terminal board is a simplex S-type terminal board accepting a YDOA I/O pack and
providing 12 form-C relay output circuits through 48 customer terminals. The SRLY has the same physical size, customer
terminal locations, and I/O pack mounting as other S-type terminal boards. There will be no components higher than an
attached I/O pack, permitting double stacking of terminal boards. Each relay on SRLY uses an isolated contact pair as position
feedback to the I/O pack.
One SRLY group is approved for use with the YDOA: the IS410SRLYS2A terminal board has pluggable, Euro style box-type
terminal blocks and two connectors that can accept a variety of optional daughterboards.
There are three optional daughterboards available to plug onto the SRLYS2A:
• IS400WROBH1A turns SRLY into the functional equivalent of the TRLYS1B. This option provides fused and sensed
power distribution to the first six relays and dedicated power to the last relay.
• IS400WROFH1A puts a single fuse in series with each relay common connection. Fuse voltage feedback is included.
• IS400WROGH1A distributes power from an input connector to each relay through a single fuse. Fuse voltage feedback is
included.
Note When using WROB, WROF, or WROG, the incoming wetting voltage can be either ac or dc.
SRLY Compatibility
Revision
YDOA I/O
Pack
Comments
SRLYS2A Yes, all versions Pluggable terminals, IEC 61508 safety certified with YDOA
SRLYS2A +
WROB
Yes
†
Some restrictions apply.
SRLYS2A + WROF Yes
†
Some restrictions apply.
Pluggable terminals, one fuse in series with each relay common terminal
Can be used for feedback from 9 to 240 V ac or from 12 to 125 V dc
SRLYS2A +
WROG
Yes
†
Some restrictions apply.
Pluggable terminals, twelve single-fused powered outputs
Can be used for feedback from 9 to 240 V ac or from 12 to 125 V dc
†
Refer to the Mark VIeS Control General Market Functional Safety Manual (GEH-6860) for restrictions.
YDOA Discrete Output Modules GEH-6855_Vol_II System Guide 161
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