Honeywell MC-TDOY23 80366189-175 Digital Output Relay FTA

Honeywell MC-TDOY23 80366189-175 Digital Output Relay FTA

The Honeywell MC‑TDOY23 80366189‑175, also cataloged as the MC‑TDOY23 digital output relay FTA, operates as a 16‑point relay‑based discrete output interface for AC/DC load switching within Honeywell controller and Safety Manager platforms.

Hardware Specifications

Channel‑to‑Channel Isolation in Honeywell Relay FTAs

Relay FTAs in Honeywell systems maintain deterministic separation between logic‑side control voltage and field‑side load circuits. The MC‑TDOY23 applies 1500 VDC isolation to prevent inductive spikes from propagating into the controller backplane. This isolation behavior aligns with Honeywell’s broader process‑control design practices, including predictable boundaries used in 4‑20 mA HART loop protocol and Fieldbus/Profibus gateway modules. Independent relay channels ensure that AC/DC loads do not cross‑couple during switching events.

Frequently Asked Questions

Q: Can the relay FTA switch both AC and DC loads? A: Yes. The output stage supports 5–250 V AC/DC across all 16 relay channels.

Q: Is there electrical isolation between the logic input and relay output? A: Yes. The module provides 1500 VDC isolation to protect the controller from field transients.

Q: Does relay life depend on load current? A: Yes. Although contacts can support up to 10 A, operating near 1 A significantly extends mechanical and electrical life.

Field Installation Guidelines

• Maintain correct polarity on the 24 VDC logic‑side control wiring.
• Route AC/DC load wiring separately from logic conductors to reduce inductive coupling.
• Observe recommended load current limits to maximize relay life.
• Verify isolation and switching behavior using system diagnostics after installation.
• Ensure cabinet airflow prevents thermal accumulation around relay assemblies