MC-TDIA12 Honeywell 51304439-175 120VAC Digital Input Board
Manufacturer: Honeywell
-
Part Number: MC-TDIA12 51304439-175
Condition：New with Original Package
Product Type: TDC 3000 Hardware
-
Country of Origin: USA
Payment:T/T, Western Union
Shipping port: Xiamen
Warranty: 12 months
Product Overview
The Honeywell MC-TDIA12 (Part No. 51304439-175) is a high-performance, 12-channel isolated digital input board engineered for the Experion PKS and legacy TDC 3000 control environments. This module captures discrete ON/OFF signals from critical field devices, including limit switches, pushbuttons, and relay contacts. By converting 120VAC field signals into precise digital data, it enables the DCS to monitor plant-wide processes with absolute accuracy. We supply this board as 100% brand new and original, ensuring full compatibility with mission-critical safety and control loops.
Technical Specifications
| Parameter | Specification Details |
| Model Number | MC-TDIA12 |
| Part Number | 51304439-175 |
| Input Channels | 12 Independent Channels |
| Input Voltage | 120 VAC Nominal |
| Isolation | Channel-to-Channel & Channel-to-System |
| Update Rate | ≤25 ms per channel |
| Dimensions | 46.2 cm x 12 cm x 5 cm |
| Weight | 1.14 kg |
| Power Consumption | 6–8 W |
| Operating Temp | –20°C to +55°C (Extended to +70°C) |
| Country of Origin | USA |
Engineering Advantages
-
Superior Signal Isolation: This board employs robust galvanic isolation between channels and the system backplane. This architecture blocks high-voltage transients and prevents ground loops from damaging the central processor, ensuring stable operation in electrically noisy environments.
-
High-Voltage AC Compatibility: Specifically designed for 120VAC logic, the MC-TDIA12 interfaces directly with standard industrial power circuits. It eliminates the need for interposing converters, reducing cabinet complexity and potential points of failure.
-
Advanced Fault Diagnostics: Built-in self-test routines and channel health monitoring detect circuit abnormalities before they cause system downtime. The module reports fault conditions directly to the Experion PKS console, streamlining maintenance and troubleshooting.
-
Rapid Signal Processing: With an update rate of ≤25 ms, the board captures rapid state changes in real-time. This high-speed response is vital for sequence-of-events (SOE) recording and emergency shutdown triggers.
-
Legacy & Modern Integration: The board maintains seamless connectivity with both legacy TDC 3000 systems and modern Experion PKS architectures, allowing for cost-effective hardware migration and plant upgrades.
FAQs
Q: Does the MC-TDIA12 support 24VDC signals?
A: No. While the internal logic interfaces with the controller, this specific hardware version (51304439-175) is optimized for 120VAC field signals. Using 24VDC on these inputs may result in failed logic state recognition.
Q: Can this board replace older 51304439 series boards?
A: Yes. The 51304439-175 serves as a direct functional replacement for earlier revisions within the MC-TDIA12 family. It fits existing system racks and uses standard Honeywell field termination assemblies (FTAs).
Q: How should I handle the installation to prevent ESD damage?
A: Always use a grounded wrist strap during installation. Mount the board directly into the designated system rack or DIN rail slot, ensuring the pins align perfectly with the backplane connector before applying pressure.
Q: Is this unit refurbished or surplus?
A: We provide only 100% brand new and original Honeywell equipment. Each board arrives in factory-sealed packaging with a full manufacturer-standard 12-month warranty, ensuring it meets the stringent E-E-A-T requirements of industrial procurement.