June 10, 2026

4256A25G02 / 1C31025G05 Emerson Ovation WDPF DCS MRC Main Remote Control Board

4256A25G02 is the legacy original Westinghouse part number, while 1C31025G05 is Emerson’s unified aftermarket spare part number. The two part numbers refer to the same second-generation MRC (Main Remote Control) master control card. It features identical hardware structure, mounting dimensions and communication protocols, supporting direct plug-and-play replacement and full downward compatibility with the first-generation base model 4256A25G01 / 1C31025G03.

Description

As the core master station module for remote I/O racks of the Ovation WDPF distributed control system, this card undertakes high-speed bidirectional data forwarding, remote bus resource scheduling, analog/digital field signal preprocessing and redundant channel switching coordination between the main control cabinet and distributed field remote RIO stations.

Compared with the first-generation G01 version, this G02 (1C31025G05) variant optimizes the main control computing chip, upgrades bus communication algorithms and shortens the response time of redundant fault switching, with enhanced long-term anti-interference performance for industrial sites. It is the most widely stocked mainstream spare part for existing thermal power and chemical projects, applicable to medium and large-scale multi-station DCS control systems.

The circuit board adopts multi-layer high-temperature resistant FR-4 industrial PCB with fully enclosed electromagnetic shielding layout. A 1000V AC/DC galvanic isolation barrier is built between remote bus terminals and internal logic circuits to filter electromagnetic noise generated by high-voltage switch cabinets, frequency converters and large rotating machinery, suitable for heavy-duty environments of thermal power, petrochemical and metallurgical industries.

Every card undergoes strict full-process factory inspection: 72-hour high-low temperature cyclic aging test, full-load long-duration bus communication burn-in test, redundant channel fault simulation and full-channel signal precision calibration. It supports single-slot hot-swappable installation on rack backplanes without shutting down the entire control system, and integrates multi-level hardware protection including surge suppression, overvoltage, overcurrent, reverse polarity prevention and short-circuit protection. Multiple independent LED diagnostic indicators are equipped to visually display power status, bus link status, remote channel operation status and hardware fault codes, enabling rapid on-site fault location and reducing unplanned production downtime and manual maintenance costs.

Model Correspondence & Version Positioning

Legacy Westinghouse part number: 4256A25G02
Official unified Emerson aftermarket spare part number: 1C31025G05
Compatibility: Direct replacement for 4256A25G01 / 1C31025G03 without system configuration modification
Positioning of each variant in the same series:

1C31025G03: G01 base version, for small-scale systems with single remote rack
1C31025G04: G02 standard version with standard bandwidth for conventional working conditions
1C31025G05: G02 enhanced stability version, mainstream widely stocked model for general projects
1C31025G06: G02 high-bandwidth high-capacity flagship version, dedicated to super-large multi-rack cluster systems

Technical Specifications

PCB Substrate: Multi-layer high heat-resistant FR-4 industrial printed circuit board
Operating Temperature Range: -25℃ ~ +75℃
Storage Humidity: 5% ~ 90% RH, non-condensing
EMC Compliance: Industrial Class II, CE & LVD certified, compliant with EN 61000 series anti-interference standards
Bus Interface: Dedicated high-speed MRC Link bus for Ovation remote racks
Isolation Withstand Voltage: 1000V AC/DC galvanic isolation between field bus terminals and internal logic circuits
On-board Protection: Surge suppression, overvoltage protection, overcurrent protection, reverse polarity protection, short-circuit protection
Installation Mode: Single-slot hot-swappable plug-in module for standard Ovation DCS rack backplane
Quality Assurance: Original Emerson/Westinghouse certified; each unit supplied with independent factory inspection test report, 12-month official warranty

Application Fields

Medium & large thermal power plant Ovation WDPF distributed control systems
Multi-unit regional petrochemical production remote I/O control cabinets
Full-process distributed production monitoring stations for metallurgical plants
Multi-station automatic control systems for large municipal wastewater treatment plants
Whole-plant remote signal acquisition racks for pulp & paper factories
Redundant DCS central control rooms for traditional heavy industry multi-rack systems
Remote monitoring automation platforms for energy and chemical continuous production lines

英文版

4256A25G02 / 1C31025G05

Emerson Ovation WDPF DCS MRC Main Remote Control Board

Product Overview

4256A25G02 is the original legacy part number of Westinghouse, while 1C31025G05 is the unified aftermarket spare part number released by Emerson. These two codes correspond to the same second-generation MRC (Main Remote Control) master card, with identical hardware structure, installation dimensions and communication protocols. It supports plug-and-play replacement and is fully backward compatible with the first-generation base model 4256A25G01 / 1C31025G03.

As the core master station module for remote I/O racks of Ovation WDPF distributed control systems, this card performs high-speed bidirectional data transmission, remote bus resource scheduling, pre-processing of analog and digital field signals, as well as coordination of redundant channel switching between the main control cabinet and distributed on-site remote RIO stations.

Compared with the G01 first-generation model, the G02 version (1C31025G05) features optimized main control computing chips, upgraded bus communication algorithms and shorter response time for redundant fault switching. Its long-term anti-interference capability for industrial sites is greatly improved. It is the mainstream stocked spare part widely used in operational thermal power and chemical plants, suitable for medium and large-scale multi-station DCS control systems.

The circuit board adopts multi-layer high-temperature resistant FR-4 industrial PCB with full-surround electromagnetic shielding layout. A 1000V AC/DC galvanic isolation design is arranged between external remote bus terminals and internal logic circuits, which effectively filters electromagnetic noise generated by high-voltage switchgears, frequency converters and large rotating equipment. It adapts to harsh working conditions in thermal power, petrochemical, metallurgy and other heavy industries.

Every board passes rigorous full-process factory tests, including 72-hour high-low temperature cyclic aging test, long-duration full-load bus communication burn-in test, redundant channel fault simulation and full-channel signal accuracy calibration. It supports single-slot hot-swappable installation on rack backplanes without shutting down the entire DCS system. Integrated multi-level hardware protections are equipped: surge suppression, overvoltage protection, overcurrent protection, reverse polarity prevention and short-circuit protection. Multiple independent LED diagnostic indicators clearly display power supply status, bus link status, remote channel operating conditions and hardware fault codes, enabling fast on-site troubleshooting and lowering unplanned production downtime and maintenance labor costs.

Model Correspondence & Version Classification

Legacy Westinghouse Part No.: 4256A25G02
Emerson Official Unified Spare Part No.: 1C31025G05
Compatibility: Direct replacement for 4256A25G01 / 1C31025G03 without system configuration modification
Series Version Positioning:

1C31025G03: G01 basic version, for small systems with single remote rack
1C31025G04: G02 standard bandwidth version for conventional working conditions
1C31025G05: G02 enhanced stability version, mainstream inventory model for general projects
1C31025G06: G02 high-bandwidth high-capacity flagship version, dedicated to super-large multi-rack cluster systems

Technical Specifications

PCB Substrate: Multi-layer high heat-resistant FR-4 industrial printed circuit board
Operating Temperature: -25℃ ~ +75℃
Storage Humidity: 5% ~ 90% RH, non-condensing
EMC Standard: Industrial Class II, CE & LVD certified, compliant with EN 61000 series anti-interference standards
Bus Interface: Dedicated high-speed MRC Link bus for Ovation remote racks
Isolation Voltage: 1000V AC/DC galvanic isolation between field bus terminals and internal logic circuits
On-board Protections: Surge suppression, overvoltage, overcurrent, reverse polarity and short-circuit protection
Installation Method: Single-slot hot-swappable plug-in module for standard Ovation DCS rack backplane
Quality Guarantee: Original Emerson/Westinghouse authentic product; each unit comes with an independent factory inspection report and a 12-month official warranty

Application Scenarios

Medium and large thermal power plant Ovation WDPF distributed control systems
Multi-unit regional petrochemical production remote I/O control cabinets
Full-process distributed production monitoring stations for metallurgical plants
Multi-station automatic control systems of large municipal wastewater treatment plants
Whole plant remote signal acquisition racks for pulp and paper factories
Redundant DCS central control rooms of traditional heavy industrial multi-rack systems
Remote monitoring automation platforms for continuous production lines in energy and chemical industries

Contact Info