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- Honeywell
- MC-TDOR12 51309148-175
- Relay Digital Output FTA
- USA
- 461 x 120 x 55 mm
- 0.82 kg
- Xiamen, China
- New & In Stock
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Product Overview
The Honeywell MC-TDOR12 (51309148-175) is a Relay Digital Output Field Termination Assembly (FTA) used in Honeywell distributed control systems (DCS). It provides an interface between control system output modules and field devices requiring high-power discrete switching, such as solenoid valves, motors, alarms, and interposing relays.
Unlike standard low-power digital output modules, this unit uses electromechanical relay contacts, enabling it to switch both AC and DC industrial loads while maintaining full electrical isolation between control and field circuits.
Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | Honeywell |
| Model | MC-TDOR12 |
| Part Number | 51309148-175 |
| Product Type | Relay Digital Output FTA |
| Output Type | Electromechanical relay (Form A / Form B contacts) |
| Channel Capacity | 16 channels |
| Rated Voltage | 120 VAC / 125 VDC |
| Load Capability | High-current industrial switching (resistive and inductive loads) |
| Isolation | Channel-to-channel electrical isolation |
| Response Time | ~10 ms typical |
| Contact Type | Silver alloy relay contacts |
| Function | Field signal termination and relay output distribution |
| Mounting Method | Control cabinet / rack-mounted FTA |
| Application | Industrial process control and automation |
| Dimensions | 461 × 120 × 55 mm |
| Weight | 0.82 kg |
Function and Working Principle
The MC-TDOR12 operates as a relay-based switching interface between the DCS and field devices:
- The control system sends digital output commands to the module.
- Internal logic routes each command to a dedicated relay channel.
- Electromechanical relays physically open or close contacts.
- Field devices (motors, solenoids, alarms) are energized or de-energized.
- Channel isolation prevents electrical faults from propagating back to the system.
This design allows safe switching of higher-voltage or higher-current loads compared to transistor-based outputs.
Key Features
- 16-channel relay-based digital output design
- Supports both AC and DC industrial loads
- Strong electrical isolation for system protection
- High current switching capability
- Rugged industrial-grade construction
- Suitable for inductive and resistive loads
- Reliable operation in harsh environments
- Standard Honeywell DCS integration
Industrial Applications
- Oil and gas production systems
- Petrochemical processing plants
- Power generation facilities
- Chemical manufacturing industries
- Water and wastewater treatment systems
- Refinery automation systems
- Industrial machinery control
- Alarm and safety interlock systems
- Process control systems
Installation
The module is installed in a Honeywell control cabinet as part of the DCS I/O system.
Installation Steps
- Mount the module in the designated rack or chassis slot
- Connect system-side output wiring from the controller
- Connect field wiring to relay output terminals
- Verify grounding and shielding integrity
- Perform loop testing and functional validation
Compatible Components
| Component | Description |
|---|---|
| Honeywell Controllers | Generate control logic and output commands |
| Field Devices | Motors, solenoids, relays, alarms |
| I/O Termination Assemblies | Field wiring interface units |
| Control Cabinets | System housing and protection |
| Power Distribution Units | Provide stable field-side power supply |
Alternative Models
| Model | Description |
|---|---|
| MC-TDOD14 | Digital Output FTA |
| MC-TDOD54 | Digital Output Module |
| MC-TAOX01 | Analog Output Terminal Module |
| MC-TDIA72 | Isolated Digital Input Module |
Advantages
- High-power relay switching capability
- Safe electrical isolation between system and field
- Supports AC and DC load switching
- Durable industrial design for long-term use
- Simplified field wiring architecture
- Reliable performance in harsh environments
- Suitable for safety-critical applications
- Easy maintenance and replacement
Frequently Asked Questions
What is the main function of MC-TDOR12?
It provides relay-based digital output switching for controlling field devices in Honeywell DCS systems.
What types of loads can it handle?
It can switch AC and DC loads such as motors, solenoids, and alarms.
Why use a relay output instead of a transistor output?
Relays provide physical isolation and higher current handling capability.
Where is it commonly used?
It is widely used in oil & gas, power plants, chemical processing, and industrial automation systems.
Conclusion
The Honeywell MC-TDOR12 (51309148-175) Relay Digital Output FTA is a robust industrial output interface designed for reliable high-power switching in distributed control systems. With its large channel capacity (16 channels), strong electrical isolation, and rugged construction (461 × 120 × 55 mm, 0.82 kg), it is widely used in mission-critical automation and process control applications.