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Honeywell MC-TDOY23 Digital Output Relay Field Termination Assembly

Configured for relay output field termination in Honeywell TDC 3000 and Experion PKS systems, the Honeywell MC-TDOY23 (80366189-175) (MC-TDOY23 Digital Output Relay Field Termination Assembly) provides direct physical and electrical execution between digital output modules and field relay circuits.

Hardware Specifications

Parameter	Specification
Model	MC-TDOY23
Brand	Honeywell
Origin	United States
Power Consumption	Determined by connected relay circuits and system interface requirements
Part Number	80366189-175
Component Type	Digital Output Relay Field Termination Assembly (FTA)
System Compatibility	Honeywell TDC 3000 / Experion PKS Distributed Control Systems
Output Channels	16 channels
Output Type	Relay dry contact outputs
Isolation Method	Galvanic isolation between control logic and field circuits
Field Connection	Screw terminal field wiring interface
Mounting Method	Standard FTA mounting channel / cabinet installation
Application	Digital switching of solenoid valves, actuators, indicators, and interlock devices

DCS Signal Isolation and Relay Output Interface

The Honeywell MC-TDOY23 provides relay-based field termination for digital output signals from Honeywell control processors. Moreover, the assembly separates low-voltage control electronics from field-side electrical loads through galvanic isolation.

The 16 relay output channels support independent switching paths for connected field devices. Therefore, the module reduces direct electrical stress on the controller output circuits during field load operation.

For Honeywell process control applications, the termination assembly supports discrete signal handling associated with DCS field interfaces. In addition, the design allows organized cabinet wiring through dedicated field terminals and channel identification.

The module operates with discrete output architectures rather than analog measurement loops. Consequently, it does not perform signal conversion, analog scaling, or HART communication functions.

Frequently Asked Questions

Q: Does the MC-TDOY23 provide analog signal processing functions?
A: No. The MC-TDOY23 is a digital output relay termination assembly designed for discrete relay switching interfaces.

Q: Does the module provide electrical isolation between the controller side and field side?
A: Yes. The relay output structure provides galvanic isolation between the control system interface and connected field circuits.

Q: How should field wiring be connected to the MC-TDOY23?
A: Field wiring should follow Honeywell cabinet wiring practices, including correct terminal assignment, signal separation, and grounding procedures.

Field Installation Guidelines

Install the MC-TDOY23 inside an approved Honeywell control cabinet using the specified FTA mounting arrangement.

Maintain separation between digital output wiring and high-energy power conductors to reduce electrical interference. Furthermore, connect cable shields according to the site grounding standard and avoid creating unintended ground loops.

Verify each relay output channel before commissioning by checking terminal identification, field device polarity requirements, and external load compatibility.

Use proper cable routing practices for relay circuits connected to inductive loads. Install external suppression components where required by the connected field equipment design.

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