4256A25G02 / 1C31025G06 Emerson Ovation DCS MRC Upgraded Main Remote Control Board_Ningde Androld Automation Equipment Co.,Ltd.

June 10, 2026

4256A25G02 / 1C31025G06 Emerson Ovation DCS MRC Upgraded Main Remote Control Board

4256A25G02 is the upgraded second-generation MRC (Main Remote Control) master board of Westinghouse Emerson 4256 series Ovation WDPF DCS, with the unified Emerson spare part number 1C31025G06, fully compatible and plug-and-play with the base version 4256A25G01 (1C31025G03). As the core control unit for distributed remote I/O racks, it undertakes bidirectional high-speed data exchange, remote bus scheduling and field signal preprocessing between the main control cabinet and multi-group on-site remote stations. Compared with G01 version, it optimizes internal processing chip, bus transmission algorithm and redundant switching logic, featuring larger data cache, faster fault switching response and stronger long-term anti-interference stability.

Description

The module adopts multi-layer high-temperature FR-4 industrial PCB with full enclosed electromagnetic shielding layout, built-in 1000V AC/DC galvanic isolation between external remote bus terminals and internal logic circuits, effectively filtering electromagnetic noise generated by high-voltage equipment, frequency converters and large rotating machinery in thermal power, petrochemical and metallurgical heavy industrial sites.

Every board passes strict factory verification: 72-hour high-low temperature cycle aging, full-load continuous bus communication test, redundant channel failure simulation and full-channel hardware accuracy calibration. It supports single-slot hot-swappable backplane installation without overall DCS system shutdown, integrated multi-stage surge suppression, overvoltage, overcurrent, reverse polarity and short-circuit protection circuits. Multiple independent LED diagnostic lights display power status, main bus link, remote channel running state and hardware fault codes, supporting rapid on-site fault location, greatly improving the expandability and continuous operation reliability of large multi-station distributed control systems, and reducing unplanned production downtime and maintenance labor costs.

Model Correspondence Note

Old Westinghouse part No.: 4256A25G02
Emerson new unified spare No.: 1C31025G06
Compatible predecessor: 4256A25G01 (1C31025G03), direct replacement without modifying system configuration
Series derivative: 4256A25G03 (higher-performance third-generation MRC board)

Technical Specifications

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

Application Fields

Large thermal power plant Ovation WDPF distributed control systems
Multi-unit regional petrochemical production remote I/O control cabinets
Metallurgical factory full-process distributed production monitoring stations
Large municipal wastewater multi-station automatic control systems
Pulp & paper whole plant remote signal acquisition racks
Traditional heavy industry multi-rack redundant DCS central control rooms
Energy chemical continuous production line remote monitoring automation platforms

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