Description
Honeywell MC-PSTX03 51304516-250
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Honeywell |
| Model | MC-PSTX03 |
| Part Number | 51304516-250 |
| I/O Type | STIM — Smart Transmitter Interface Multivariable |
| Module Category | IOP |
| Number of Inputs | 16 |
| Transmitter Support | Smart / single-variable / multivariable |
| Smart Transmitter Protocol | Honeywell digital enhanced protocol, bidirectional |
| Input Configuration | Single-ended or differential in relation to ground |
| CE Status | CE-compliant |
| Coating | Conformally coated |
| Redundancy | Supported |
| System Family | Honeywell UCN / TDC control systems |
| Compatible FTA Families | MC-TAIHxx, MC-TSTXxx and associated MU-series equivalents |
| Installation | Honeywell IOP card file |
| Exact Supply Specification | Verify against system hardware documentation |
| Exact Input Electrical Limits | Verify against applicable Honeywell STIM/FTA documentation |
| Operating Temperature | Verify against the installed system specification |
| Weight | Approx. 0.73 kg reported for the complete part listing |
Honeywell’s published Experion Control Hardware Planning Guide identifies MC-PSTX03 as the STIM IOP and assigns 51304516-250 as its CE-compliant part number. The same documentation distinguishes it from MC-PSTX02, which is the STI rather than STIM implementation.
Field hardware documentation identifies the 51304516-250 assembly as a 16-input Smart Transmitter Interface Multivariable processor. The available technical records describe the inputs as configurable for single-ended or differential operation relative to ground and identify support for Honeywell digital enhanced protocol, single-variable transmitters, and multivariable transmitters.
51304516‑250
Product Introduction
The Honeywell MC-PSTX03 51304516-250 is a Smart Transmitter Interface Multivariable IOP used in Honeywell control-system architectures. Unlike a conventional analog input card, its purpose is to provide the interface between the control system and compatible smart or multivariable transmitters. The 16-input architecture allows a single IOP to service multiple transmitter channels while retaining the transmitter-specific communication functionality supported by the STIM architecture.
The 51304516-250 is the CE-compliant, conformally coated version of the MC-PSTX03. Honeywell’s hardware documentation separates it from the earlier 51304516-100 and from the MC-PSTX02 STI family. That distinction matters during maintenance because the IOP number, FTA type, transmitter protocol, and system configuration all have to agree.
Engineering Pain Point
The main replacement risk is treating 51304516-250 as an ordinary 16-channel analog input card. It is not. The STIM architecture is specifically intended for smart and multivariable transmitter interfaces, and its compatible FTA selection is part of the system design. A replacement can have the correct physical card number yet still fail to operate correctly if the existing FTA, transmitter protocol, redundancy arrangement, or IOP configuration does not match.
Typical Applications
- Smart transmitter acquisition — Interfaces compatible Honeywell smart transmitters with the control system.
- Multivariable transmitter systems — Handles transmitter devices that provide multiple process variables through the STIM architecture.
- Legacy Honeywell DCS installations — Maintains existing UCN/TDC control-system I/O without replacing the complete field instrumentation architecture.
- Redundant I/O applications — The STIM IOP architecture supports redundancy where the overall hardware configuration is designed for it.
Technical Pitfalls to Avoid
- Do not confuse STIM with STI. Honeywell lists MC-PSTX02 as STI and MC-PSTX03 as STIM. The corresponding part numbers and transmitter functions are different.
- Verify the FTA before replacing the IOP. Compatible FTA families include MC-TAIH02, MC-TAIH12, MC-TAIH22, MC-TAIH52, MC-TAIH62 and MC-TSTX03/13, with corresponding MU-series configurations. The FTA must match the actual field wiring and transmitter architecture.
- Check the CE/coating designation. 51304516-250 is documented as the CE-compliant, conformally coated MC-. Do not automatically substitute another MC- identifier without checking the complete part number.
- Confirm the transmitter protocol. The STIM interface supports Honeywell’s digital enhanced protocol as well as single-variable and multivariable transmitter applications. A conventional 4–20 mA transmitter should not automatically be assumed compatible simply because the system uses an analog-looking field connection.
- Check redundancy architecture. Redundancy is supported, but that does not mean every installed 51304516-250 operates in a redundant configuration. Verify the card-file arrangement, associated IOPs, FTAs, and system configuration.
- Do not rely on generic electrical specifications from reseller listings. Public sources agree on the model, 16-input STIM function, CE status, and FTA relationships, but the exact electrical limits should be taken from the Honeywell hardware documentation applicable to the installed system.
Related Products
- Honeywell MC-PSTX02 / 51304516-150 — STI IOP for smart transmitter applications; different from the multivariable STIM architecture.
- Honeywell MU- / 51304516-200 — Non-CE STIM IOP counterpart; verify system and compliance requirements before substitution.
- Honeywell 51304516-100 — Earlier non-CE STIM-related part identified as a predecessor to 51304516-250 in documented replacement records.
- Honeywell MC-TAIH02 — Compatible FTA family member for applicable STI/STIM configurations.
- Honeywell MC-TAIH22 — Redundant STI/STIM FTA option; verify actual field architecture before selection.
- Honeywell MC-TAIH62 — Another FTA option associated with the STI/STIM family.
- Honeywell MC-TSTX03 — STIM-related termination assembly used with applicable transmitter interfaces.
- Honeywell 51304754-150 / MC-PAIH03 — High-level analog input IOP; functionally different from the STIM interface.
Procurement Note
Specify the replacement as:
Honeywell MC- — 51304516-250 — Smart Transmitter Interface Multivariable (STIM), 16-input, CE-compliant, conformally coated.
Before procurement, verify the installed IOP number, FTA part number, transmitter type, redundancy arrangement, card-file location, and system configuration. The most important distinction is between 51304516-250 / MC- STIM and the related MC-PSTX02 STI hardware.
If the installed card is being replaced in an operating Honeywell DCS, the original label photograph and the associated FTA part number should be retained as part of the replacement record. That combination provides much stronger interchangeability evidence than the 51304516-250 number alone.
