Description
Product Overview
The Honeywell MC-GOAX02 51304638-175 is a galvanically isolated analog output Field Termination Assembly designed for Honeywell process control hardware. It provides the field wiring interface for analog output signals used to operate control valves, positioners, actuators, and other equipment requiring a 4–20 mA command. The assembly is specified as an eight-channel, nonredundant configuration with compression terminals. Its galvanic isolation separates the relevant field-side signal circuits from other electrical domains, helping reduce the effects of ground-potential differences and unwanted electrical coupling in distributed control installations.
In a process control system, analog output termination is not simply a wiring task. Each loop must maintain the correct electrical interface between the controller-side hardware and the connected field device. The Honeywell MC-GOAX02 51304638-175 is intended for installations that require isolated analog output channels. Its eight-channel arrangement supports multiple field loops within one assembly, while compression terminals provide the physical connection point for field conductors. The documented B-size form factor is relevant when checking cabinet layout and replacement fit.
The suffix matters during procurement. Honeywell’s model-number documentation lists 51304638-150 as the non-CE-compliant part number and 51304638-175 as the CE-compliant part number for MC-GOAX02. The -175 version is therefore not interchangeable with every item in the broader 51304638 family. Redundant configurations and crimp-terminal variants have separate model designations. Before replacing an installed assembly, verify the system drawing, I/O configuration, terminal arrangement, and field wiring requirements. The Honeywell MC-GOAX02 51304638-175 should be selected by exact model and part number, not by the general description “analog output FTA.”
Product Introduction
An analog output fault can affect valve position, flow regulation, pressure control, or equipment sequencing. When troubleshooting an output loop, engineers need to distinguish controller-side faults from field wiring problems, grounding issues, and termination hardware failures. The MC-GOAX02 provides an isolated eight-channel termination interface for applicable Honeywell analog output installations.
For replacement work, confirm the installed assembly’s full part number and terminal configuration before disconnecting field conductors. A matching channel count alone does not establish compatibility. Check the I/O documentation and cabinet wiring schedule, particularly when replacing an older assembly or changing between nonredundant and redundant configurations.
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Honeywell |
| Model | MC-GOAX02 |
| Part Number | 51304638-175 |
| Product Type | Galvanically isolated analog output FTA |
| I/O Function | Analog output |
| Channel Count | 8 |
| Output Signal | 4–20 mA DC |
| Redundancy | Nonredundant |
| Terminal Type | Compression |
| Assembly Size | B-size |
| Approximate Length | 307 mm, as listed in hardware documentation |
| Isolation | Galvanic isolation |
| Coating | Conformally coated |
| Compliance | CE-compliant version |
| Supply Voltage | Not verified; check the applicable system manual |
| Output Load Limit | Not verified from the cited manufacturer documentation |
| Output Accuracy | Not verified |
| Operating Temperature | Not verified |
| Mounting Details | Confirm against the cabinet and FTA installation drawings |
| Firmware Requirement | Not established as a standalone FTA specification |
The eight-channel configuration and B-size classification are supported by Honeywell hardware documentation. Some third-party listings state a load resistance below 750 ohms, but that figure should be checked against the applicable I/O and FTA documentation before being used as a commissioning limit.
MC-GOAX02 51304638-175
Major Features and Advantages
Galvanically isolated analog output circuits
The MC- is designed for applications where analog output circuits require galvanic isolation. This separation can help reduce ground-loop effects and limit the transfer of unwanted electrical potentials between field wiring and other system circuits. It is particularly relevant where field devices are distributed across different cabinet sections or electrical grounding zones.
Eight-channel termination arrangement
Eight analog output channels are provided in one assembly. This arrangement can simplify cabinet organization and field-loop termination compared with using separate termination hardware for each output. During maintenance, engineers should still identify each channel by the project wiring schedule rather than relying only on terminal position.
Nonredundant configuration
MC- is identified as a nonredundant analog output assembly. It should therefore be used only where the system design calls for this configuration. It is not a substitute for a redundant assembly simply because the channel count or general product family appears similar.
Compression terminal connections
Compression terminals provide the field conductor interface. Correct wire preparation, conductor size, terminal condition, and tightening procedure are important during installation. Poor termination can introduce intermittent loop faults that may be mistaken for an I/O or field-device problem.
Conformal coating
The MC- belongs to Honeywell’s conformally coated MC hardware range. This coating designation is useful when checking the environmental requirements of a control cabinet. It does not, by itself, establish an enclosure IP rating or make the assembly suitable for direct exposure to moisture, corrosive liquids, or outdoor conditions.
CE-compliant part-number identification
The 51304638-175 designation is listed as the CE-compliant version of MC-. The corresponding non-CE part number is 51304638-150. Procurement teams should preserve the full suffix in purchase records and receiving inspections to prevent an unintended variant substitution.
Related Products
These models belong to related Honeywell galvanically isolated I/O hardware families. They are not automatically interchangeable.
- MC-GAOX12 – Redundant analog output assembly; verify its separate system configuration and part number.
- MC-GAOX72 – Nonredundant analog output assembly with crimp terminals.
- MC-GAOX82 – Redundant analog output assembly with crimp terminals.
- MC-GDID12 – Galvanically isolated digital input assembly with compression terminals.
- MC-GDID13 – Galvanically isolated digital input assembly in a separate model configuration.
- MC-GDOD12 – Galvanically isolated digital output assembly.
- MC-GPRD02 – Galvanically isolated power distribution assembly.
- MC-GHAO11 – High-level analog output assembly.
- MC-GHAO21 – High-level analog output assembly with HART-related functionality.
Honeywell’s model tables distinguish these assemblies by I/O function, redundancy, terminal type, and part number.
Frequently Asked Questions
Q1: What is the primary function of the Honeywell MC- 51304638-175?
It is an eight-channel, nonredundant, galvanically isolated analog output Field Termination Assembly. It provides the field wiring interface for applicable Honeywell analog output loops.
Q2: Does MC- support 4–20 mA output?
Yes. The documented assembly is an analog output FTA for 4–20 mA DC applications. Confirm the specific I/O module and field-load requirements before commissioning.
Q3: Is 51304638-175 interchangeable with 51304638-150?
They share the MC- model designation, but the suffix identifies a compliance variant. Honeywell lists -175 as CE-compliant and -150 as non-CE-compliant. Use the part number required by the project’s approved hardware documentation.
Q4: Can MC- replace a redundant analog output assembly?
Do not assume so. MC- is identified as nonredundant. Redundant analog output configurations use separate model designations, such as MC-GAOX12. Check the controller configuration and system drawings before substitution.
Q5: Can I hot-swap this assembly?
Do not assume hot-swap capability. The safe procedure depends on the associated I/O hardware, cabinet architecture, process state, and approved maintenance instructions. Confirm the applicable Honeywell procedure and isolate affected loops when required.
Q6: Does this assembly support firmware v3.1?
Firmware compatibility is not established by the FTA part number alone. The relevant controller, I/O module, system release, and hardware revision determine compatibility. Verify these details in the system’s approved compatibility documentation.
Q7: What should be checked before purchasing a replacement?
Confirm the complete part number 51304638-175, model MC-, eight-channel configuration, compression terminals, coating status, and CE requirement. Request clear photographs of the label and terminal side, plus available inspection or functional-test records. Confirm whether the unit is new, refurbished, or used.
Procurement and Quality-Control Notes
Before installation, compare the received unit’s label and revision with the approved bill of materials. Inspect the terminal blocks, PCB condition, connectors, and coating for physical damage or signs of previous repair. For used or refurbished stock, request documented inspection results and, where practical, an analog-loop functional test.
Procurement priority: Match the complete MC- 51304638-175 designation and verify the nonredundant eight-channel compression-terminal configuration. Do not approve a substitute based only on the 51304638 family number.
