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3A58977G18

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3A58977G18
June 05, 2026

3A58977G18

Product Type: MMI Rack Multi-Port Serial Communication & Auxiliary Interface Board, belongs to the same 3A589XX series with 3A58939G15,3A58945H01,3A5897618 for legacy WDPF / early Ovation DCS operator station console. Original mass production discontinued by Emerson; available stock includes factory-tested refurbished modules and surplus unused original spare parts for power & petrochemical DCS overhaul replacement.

Description

1. Product Basic Info

Manufacturer: Westinghouse (later acquired by Emerson Process Management, USA)
Part No.: 3A58977G18, Revision G18
Product Type: MMI Rack Multi-Port Serial Communication & Auxiliary Interface Board, belongs to the same 3A589XX series with 3A58939G15,3A58945H01,3A5897618 for legacy WDPF / early Ovation DCS operator station console.
Original mass production discontinued by Emerson; available stock includes factory-tested refurbished modules and surplus unused original spare parts for power & petrochemical DCS overhaul replacement.

2. Electrical & Mechanical Specifications

  • Input Power: +5VDC, ±12VDC powered via WESTBUS rack backplane; built-in isolated DC-DC converter, typical power consumption:15.2W

  • Communication Bus: WESTBUS backplane main bus + 4-channel isolated RS232 serial peripheral port; interconnects CRT display driver card, keyboard/mouse control board and local HMI controller inside MMI rack

  • Physical Size: Standard Eurocard plug-in dimension:235mm ×163mm ×28mm, net weight:1.38kg

  • Environmental Rating: Operating ambient:0℃~+55℃ in sealed control cabinet; storage temperature:-40℃~+85℃; full PCB conformal three-proof coating, anti-vibration soldering; compliant with UL safety and CE industrial EMC standards for power plant automation equipment

3. Core Functions

  1. Multi-channel Serial Data Conversion: Converts parallel WESTBUS bus data into isolated RS232 serial signal for console keyboard, mouse and external auxiliary HMI terminal data interaction, isolates interference between backplane bus and field peripheral wiring.

  2. Onboard Multi-loop Power Distribution: Stabilized auxiliary power output for adjacent plug-in interface cards; integrated overvoltage, overcurrent and short-circuit fuse protection to avoid cascade damage of rack modules from power fluctuation.

  3. Front-panel Diagnostic Indication: Multi-color LED indicators for power input status, WESTBUS communication fault, each serial channel abnormal alarm; fault diagnostic data uploaded to upper DPU controller via backplane bus for system centralized fault logging.

  4. Cold-swap Maintenance Support: Permits single slot power cut and independent card replacement without full MMI rack shutdown, reducing field maintenance downtime for control room repair work.

4. Typical Application

Primarily used as spare replacement for aged operator station racks of coal-fired power plant boiler/turbine WDPF/Ovation DCS central control room; also widely used in petrochemical refining, metallurgy, municipal heating old DCS console upgrade and daily maintenance spare parts inventory.

5. Installation & Maintenance Rules

  1. Cut off the target slot power before installation; align card guide with cabinet slot and insert vertically, lock front fixing buckle; verify backplane voltage matching before restoring rack power supply.

  2. Connect keyboard, mouse and external serial peripherals to corresponding onboard RS232 ports, perform full HMI communication loop test after power-on.

  3. Complete PCB surface dust removal every six months; store spare cards in ESD-protected dry warehouse, conduct quarterly short-time power-on aging inspection to prevent component degradation from long-term idle storage.

6. Supply Status

Emerson stopped original formal production of this revision G18; available procurement options: certified tested refurbished spare modules or updated alternative communication board for system modification retrofit projects.


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