Overview
The Honeywell MU-TDOY23 51204166-125, also cataloged as the MU-TDOY23 Digital Output Relay Field Termination Assembly, provides physical relay switching between the MU/MC-PDOY22 output I/O module and external AC or DC field loads in Honeywell TPS control systems. The assembly contains 16 electromechanical relay circuits and uses compression terminals for field wiring.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | MU-TDOY23 |
| Full Part Number | 51204166-125 |
| Brand | Honeywell |
| Product Type | Digital Output Relay Field Termination Assembly |
| Dimensions | Size B; approximately 12 in (307 mm) |
| Relay Channels | 16 independent electromechanical relay circuits |
| Output Type | Relay digital output |
| Load Voltage | Up to 240 VAC / 125 VDC |
| Field Connection | Compression terminals |
| Compatible I/O Module | MU/MC-PDOY22 |
| I/O Capacity | 16 output circuits per FTA |
| 32-Channel Configuration | Two FTAs can support one 32-channel I/O configuration |
| Redundancy | Supported where the associated system architecture permits |
| Compliance | CE-compliant version identified for 51204166-125 |
| Conformal Coating | Non-conformal coated version |
| Application Platform | Honeywell TPS and related process control systems |
Honeywell DCS Relay Output Interface
The MU-TDOY23 terminates discrete output signals from the MU/MC-PDOY22 I/O module and switches external field circuits through 16 electromechanical relays. Each relay provides an individual output circuit for connected field equipment. Therefore, the FTA separates the control-side output interface from the switched field circuit.
The assembly supports AC and DC field loads within the stated voltage limits. Furthermore, compression terminals provide the physical connection point for field wiring. The FTA can also participate in redundant I/O arrangements when the installed Honeywell architecture supports the required configuration.
The MU-TDOY23 is a relay termination assembly rather than an analog signal conditioning device. Consequently, 4-20 mA HART, FOUNDATION Fieldbus, and Profibus PA functions should not be assigned to this hardware unless they are provided by another component in the control system.
Frequently Asked Questions
Q: How many relay output circuits does the MU-TDOY23 provide?
A: The MU-TDOY23 provides 16 independent electromechanical relay output circuits.
Q: What field load voltages does the MU-TDOY23 support?
A: The supplied specification identifies load switching up to 240 VAC or 125 VDC. The actual load current and circuit protection must match the connected field device and installation requirements.
Q: Which I/O module interfaces with the MU-TDOY23?
A: The supplied technical data identifies the MU/MC-PDOY22 as the compatible digital output I/O module.
Field Installation Guidelines
- Verify the complete FTA identification as MU-TDOY23 51204166-125 before installation.
- Confirm the installed I/O module is compatible with the MU-TDOY23 termination assembly.
- Verify the voltage and current requirements of each connected AC or DC load.
- Follow the Honeywell terminal assignment and field-wiring documentation for the installed system.
- Keep power wiring separated from low-level instrumentation and communication wiring where required.
- Apply appropriate circuit protection to externally powered field loads.
- Verify protective grounding and cabinet bonding according to the installation design.
- Check terminal tightness and conductor routing before energizing the assembly.
- Perform continuity checks before applying field power.
- Test each relay output from the control system after commissioning.
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