4256A25G02 / 1C31025G04 Emerson Ovation WDPF DCS MRC Main Remote Control Board_Ningde Androld Automation Equipment Co.,Ltd.

June 10, 2026

4256A25G02 / 1C31025G04 Emerson Ovation WDPF DCS MRC Main Remote Control Board

4256A25G02 is the old Westinghouse part number, 1C31025G04 is Emerson’s unified spare part number, the two numbers correspond to the same second-generation MRC (Main Remote Control) remote master control board of the Ovation WDPF distributed control system, fully plug-and-play interchangeable.

Description

This board is the core communication master station module for remote I/O racks, responsible for high-speed two-way data transmission, remote bus resource scheduling and field analog/digital signal preprocessing between the main control cabinet and distributed field remote stations. Compared with the basic version 4256A25G01/1C31025G03, this upgraded G02 model optimizes the main control chip, bus communication algorithm and redundant switching logic, with larger data cache and faster fault switching speed, suitable for medium-sized multi-station DCS control systems.

The circuit board adopts multi-layer high-temperature resistant FR-4 industrial PCB with full surrounding electromagnetic shielding design. 1000V AC/DC isolation is set between the external remote bus terminal and the internal logic circuit, which can effectively resist strong electromagnetic interference generated by high-voltage equipment, frequency converters and large rotating machinery in thermal power, petrochemical, metallurgy and other heavy industrial sites.

Each finished product passes strict factory testing: 72-hour high and low temperature cycle aging test, full-load long-time bus communication aging test, redundant channel fault simulation and full-channel hardware precision calibration. It supports single-slot hot-swappable backplane installation without shutting down the whole DCS system, and integrates multi-level surge suppression, overvoltage, overcurrent, reverse connection and short-circuit protection circuits. Equipped with multiple independent LED diagnostic indicators to display power supply, main bus link, remote channel operation and hardware fault codes, it facilitates rapid on-site fault location, improves the continuous operation stability of the system, and reduces unplanned production downtime and maintenance costs.

Model Matching & Version Difference Description

Westinghouse original part No.：4256A25G02
Emerson aftermarket spare part No.：1C31025G04
Compatibility: Direct replacement of 4256A25G01/1C31025G03, no modification of system configuration required
Series version positioning distinction

1C31025G03: G01 basic version, for small and medium systems
1C31025G04: G02 standard bandwidth conventional version
1C31025G05: G02 enhanced stability mainstream stocking version
1C31025G06: G02 high-capacity high-bandwidth flagship version for super multi-rack systems

Technical Specifications

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

Application Fields

Medium and large thermal power plant Ovation WDPF distributed control system
Multi-unit regional petrochemical production remote I/O control cabinet
Metallurgical factory full-process distributed production monitoring station
Large municipal wastewater multi-station automatic control system
Pulp and paper plant whole factory remote signal acquisition rack
Traditional heavy industry multi-rack redundant DCS central control room
Energy chemical continuous production line remote monitoring automation platform

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