Emerson 4256A25G02 & 1C31025G04 Ovation DCS Signal Module

June 10, 2026

Emerson 4256A25G02 & 1C31025G04 Ovation DCS Signal Module

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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