Overview
Manuals
AC Status Inputs
Event Processor Pairing
Coated AC Assembly
Features:
- Terminates 32 isolated 120 V AC digital input circuits.
- Conformally coated MC construction with compression terminals.
- Supports the documented PDIX02 / PDIS12 processor pairings.
The MC-TDIA12 is a 32-circuit field termination assembly for isolated 120 V AC digital input service. Its field voltage class is an essential selection characteristic: it is not a 24 V DC input board and it is not an output relay assembly. Honeywell lists the TDIA12 termination with the PDIX02 digital input processor and the PDIS12 sequence-of-events processor. The MC designation identifies the conformally coated version of this FTA family.
Field wires connect through compression terminals, while a phone-style FTA cable connects the assembly to the I/O processor. The size-C board measures 462.28 mm in length and 120.65 mm in width, so cabinet space and cable access should be checked before replacement. Sequence-of-events capability depends on the PDIS12 processor and the configured system; the termination board alone does not supply an event recorder. Reconcile the complete assembly marking and field voltage against the installed drawings before energization.
The MC-TDIA12 51304439-175 Honeywell Isolated AC Input Termination may still be available for purchase and support from Moore Automated Company beyond End-Of-Life (EOL) by the manufacturer (OEM).
Honeywell MC-TDIA12 51304439-175 documentation and reference links.
Important Notice: This excerpt retains the original Honeywell IO03-500 cover, applicable model tables, electrical specifications and their footnotes. It is a historical specification, not a current lifecycle notice. Match the complete assembly label and installed processor before replacement.
This termination is intended for 120 V AC digital input circuits. Verify the actual field source and the approved input wiring before connection. Neither the 32-circuit count nor similar board dimensions makes a 24 V DC or 240 V AC termination interchangeable with it.
The manufacturer matrix lists both ordinary digital-input and sequence-of-events processor pairings. Use the installed PDIX02 or PDIS12 designation to determine the applicable system behavior. Event resolution, time synchronization and database configuration must be checked in the processor and system documentation, not inferred from the FTA label.
The MC version includes conformal coating, but coating is not an electrical isolation rating or permission for exposed installation. Maintain the approved enclosure and clearances, and inspect the field terminals and cable connection. Select the assembly by its complete marking rather than the appearance of its protective finish.
