Description
Honeywell MC-TAIH02 | 16-Channel HLAI/STI FTA
The Honeywell MC-TAIH02 is a field termination assembly used for 16-channel high-level analog input and Smart Transmitter Interface (STI) applications. Honeywell’s TPS Process Manager I/O documentation lists MC-TAIH02 as the conformally coated counterpart to MU-TAIH02 and identifies both as High Level Analog Input/STI FTA, 16 inputs, using compression terminals.
That distinction matters when sourcing replacement hardware. The MC-TAIH02 is an FTA, not the analog input processor. Current Honeywell-part references associate 51304453-150 with MC-TAIH02 and identify the compatible HLAI processor family separately, including MC-PAIH03.
For procurement purposes, the clean identification is:
Honeywell MC- — P/N 51304453-150
Do not substitute a visually similar Honeywell TAIH-series FTA without checking the complete part number and I/O processor compatibility. The TAIH family contains several variants for standard, redundant, CE and enhanced-protection applications. Honeywell’s documentation distinguishes these variants by model number.
MC-TAIH02
Key Technical Specifications
- Model: MC-
- Honeywell P/N: 51304453-150
- FTA classification: HLAI/STI
- Function: High-Level Analog Input / Smart Transmitter Interface
- Number of inputs: 16
- Termination: Compression terminals
- Connector arrangement: Phone connector-style termination
- FTA family: Honeywell TPS Process Manager / UCN I/O
- Processor compatibility: MC-PAIH03 is identified with MC- as a compatible FTA
- Construction: Conformally coated MC variant
- Signal architecture: High-level analog input and STI field interface
- Physical role: Field wiring termination and interface to the I/O processor
- Typical system context: Honeywell DCS process-control installations
Honeywell’s published TPS Process Manager I/O material specifically identifies MU- and MC- as 16-input High Level Analog Input/STI FTAs.
A current Honeywell I/O reference also maps MC- 51304453-150 to the HLAI/STI FTA category and lists 16 inputs.
What the MC- Actually Does
Think of the MC- as the field wiring side of the analog-input channel.
A simplified architecture is:
Field transmitter → MC- FTA → I/O processor → Honeywell control system
The FTA provides the physical termination and signal interface required by the Honeywell I/O architecture. The actual analog conversion and processing should not be attributed to the FTA alone; the associated I/O processor performs the processor-side input function.
This is why the distinction between and MC-PAIH03 is important.
The Western Process Computers catalog identifies:
- MC-PAIH03 / 51304754-150 — High Level Analog Input Processor
- MC- / 51304453-150 — High Level Analog Input FTA
It also lists MC- among the compatible FTA choices for the HLAI processor.
16-Channel Configuration
The MC- is specified as a 16-input FTA.
Honeywell’s TPS documentation distinguishes it from other members of the TAIH family, including:
- MU- — standard HLAI/STI FTA
- MC- — conformally coated HLAI/STI FTA
- MU-TAIH12 / MC-TAIH12 — redundancy-related variant
- MU-TAIH03 / MC-TAIH03 — CE-marked HLAI variant
- MU-TAIH13 / MC-TAIH13 — CE-marked redundant variant
- TAIH22/23 variants — enhanced-power/protection configurations
These are not interchangeable solely because the model numbers look similar. Honeywell’s documentation assigns different functions and application arrangements to the variants.
For a replacement purchase, retain the complete designation rather than searching only for “.”
Relationship to MC-PAIH03
This is the most important cross-reference for maintenance engineers.
The is the field termination assembly.
The MC-PAIH03 is the High-Level Analog Input processor.
A current industrial I/O reference lists MC- as a compatible FTA for MC-, while identifying the processor as 51304754-150.
Therefore, if a plant technician reports an “MC- analog input card failure,” verify the hardware location before ordering.
The actual failed component could be:
- The MC- FTA
- MC- I/O processor
- FTA cable/connector
- Field transmitter
- Field wiring
- Terminal connection
- Power/interface circuitry
- Another component in the I/O path
Replacing the wrong half of the FTA/IOP pair wastes time and can introduce another configuration error.
Global Sourcing & Incoming-Test SOP
The following is a recommended procurement and incoming-inspection procedure. It does not mean that a particular surplus or marketplace unit has already been tested.
1. Identity Verification
Before accepting the part:
- Confirm Honeywell marking.
- Confirm .
- Confirm 51304453-150 where applicable.
- Photograph the complete nameplate.
- Record serial number and revision markings.
- Check that the physical assembly matches the expected construction.
2. Physical Inspection
Inspect:
- Compression terminals
- Connector interfaces
- PCB surface
- Conformal coating
- Terminal screws
- Connector pins
- Mounting hardware
- Housing
- Signs of corrosion
- Contamination
- Heat damage
- Previous rework
For a used MC-series assembly, inspect the conformal coating carefully. Scratches or localized coating removal may indicate previous repair or mechanical damage.
3. Channel Verification
Use a controlled test fixture and the appropriate Honeywell documentation to verify all 16 channels.
Do not simply check one channel and declare the FTA good.
A proper receiving test should document:
- Channel identification
- Continuity
- Terminal integrity
- Signal path
- Isolation/protection behavior where applicable
- Connector integrity
- I/O processor communication
4. System-Level Test
Where possible, connect the MC- to a known-good compatible I/O processor and approved test equipment.
Verify representative analog inputs across the supported operating range defined by the associated Honeywell I/O documentation.
If STI functionality is required, perform a separate STI communication test rather than assuming that analog continuity proves STI operation.
5. Documentation
Record:
- Model
- Part number
- Serial number
- Revision
- Incoming condition
- Test equipment
- Test date
- Technician
- Channel results
- Pass/fail disposition
For legacy Honeywell hardware, this documentation is useful when several visually similar FTA variants exist in the same plant.
Field Engineer’s Pitfall Guide
1. Do not confuse MC- with MC-.
This is the most common procurement mistake to avoid.
MC- = HLAI I/O processor
The two components serve different positions in the Honeywell I/O architecture.
2. Do not replace TAIH variants by appearance alone.
Honeywell has multiple TAIH-series FTAs with different functions, redundancy arrangements and compliance configurations. MC-, MC-TAIH03, MC-TAIH12 and MC-TAIH22 are not generic substitutes for one another.
Verify the complete model number against the plant’s I/O drawing before issuing a PO.
3. Be careful with reseller electrical specifications.
Several aftermarket suppliers publish detailed voltage, current, accuracy and temperature figures for MC-, but those figures are not consistently presented across sources.
For procurement documentation, the strongest consistently supported identification is:
16-channel High-Level Analog Input/STI FTA, compression termination, P/N 51304453-150.
Do not copy an unverified reseller specification into a purchase specification when the Honeywell system drawing is available.
FAQ
Q: What is Honeywell MC-?
A: It is a 16-input High-Level Analog Input / Smart Transmitter Interface Field Termination Assembly used in Honeywell process-control I/O systems.
Q: What is the Honeywell part number?
A: 51304453-150 is associated with MC-.
Q: Is MC- an I/O processor?
A: No. It is an FTA. The associated HLAI processor is a separate component; MC- is documented as a compatible processor.
Q: How many channels does MC- have?
A: 16 inputs. Honeywell’s TPS Process Manager I/O documentation explicitly identifies MC- as a 16-input HLAI/STI FTA.
Q: What type of termination does it use?
A: The documented configuration uses compression terminals with phone connector-style terminations.
Q: What does the “MC” designation indicate?
A: In Honeywell’s FTA documentation, the MC models are the conformally coated versions of the corresponding MU FTA designs.
Q: Can MC- be replaced with MC-TAIH03?
A: Do not assume so. Honeywell assigns different functions/configurations to the TAIH03 and families. Verify the system drawing, processor compatibility and required FTA configuration before substitution.
Q: What should I request from a surplus supplier?
A: Request clear photographs of the and 51304453-150 markings, serial/revision information, connector and terminal condition, conformal-coating condition, and evidence of a controlled channel-level test. A statement such as “power tested” is not equivalent to a complete 16-channel functional test.
