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The MC-TDOY23 (51204166-175) is a Digital Output Relay Field Termination Assembly (FTA) designed for Honeywell Experion PKS and TDC 3000 control systems. It provides a robust physical interface between low-voltage controller logic and high-power field devices by using onboard...
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The MC-TDOY23 (51204166-175) is a Digital Output Relay Field Termination Assembly (FTA) designed for Honeywell Experion PKS and TDC 3000 control systems. It provides a robust physical interface between low-voltage controller logic and high-power field devices by using onboard electromechanical relays.
Unlike solid-state digital outputs, the MC-TDOY23 enables the switching of higher currents and mixed AC/DC voltage levels, making it ideal for demanding industrial loads. Built for continuous duty operation, the module delivers high galvanic isolation to protect Input/Output Processors (IOPs) from field-side surges, noise, and wiring faults. Its compact form factor supports efficient cabinet layouts while maintaining clear and accessible field wiring termination.
| Parameter | Description |
|---|---|
| Model Number | MC-TDOY23 |
| Part Number | 51204166-175 |
| Device Category | Digital Output Relay FTA |
| Output Type | Electromechanical relay (dry contact) |
| Electrical Isolation | High-level galvanic isolation (logic to field) |
| Dimensions (L × W × H) | 12.5 × 4.0 × 7.8 cm |
| Unit Weight | 0.7 kg |
| Mounting Method | Vertical or horizontal FTA base compatible |
| Field Connectivity | Heavy-duty screw / compression terminals |
Heavy-Duty Actuation
Switching high-current pneumatic or hydraulic solenoid valves.
Motor Control Interfaces
Driving MCC contactor coils and interposing relay circuits from DCS logic.
Voltage & Signal Isolation
Providing a physical isolation barrier between 120/240 VAC field circuits and 24 VDC control electronics.
Legacy System Support
Maintaining and extending the operational life of TDC 3000 and Experion PKS installations.
Q: What advantage does the MC-TDOY23 have over standard digital output FTAs?
A: The MC-TDOY23 provides dry relay contacts, allowing it to switch higher-current AC or DC loads with superior physical isolation compared to solid-state outputs.
Q: Are the relays field-replaceable?
A: In most hardware revisions, the relays are integrated into the assembly to ensure vibration resistance and long-term contact reliability in industrial environments.
