ABB COM0003 Serial Communication Expansion Module

Description

Hardware and Performance Specifications Auxiliary supply: Powered through CPU rear slot, no separate external power supply Power consumption: ≤4 W Interface: 1‑channel RS232 (DB9 male); 1‑channel RS422/RS485 (terminal block, software selectable) Isolation: RS485/422 port with 2.5 kV galvanic isolation, suppress ground loop interference Baud rate: 300‑115200 bps programmable Mounting mode: Plug‑in card for CPU rear expansion slot of AC800M controller Protection class: IP20 Operating temperature: ‑25 ℃ ~ +70 ℃ Storage temperature: ‑40 ℃ ~ +85 ℃ Humidity: 5‑95 %RH non‑condensing EMC compliance: Comply with IEC 61000‑4 series industrial electromagnetic‑compatibility standards Dimension & weight: approx. 150 × 100 × 30 mm, weight approx. 0.28 kg Certifications: CE approval

Main Functions Expand serial communication channel resources for AC800M controller. Work as Modbus RTU master/slave, complete data reading‑writing with field Modbus devices. Support custom ASCII‑binary protocol communication for special third‑party equipment docking. Galvanic‑isolated RS485 channel, reduce site ground‑loop and electromagnetic interference impact. Front‑panel LED indicators display module power‑on status, communication sending/receiving status and hardware fault codes for on‑site inspection. Hardware self‑diagnosis detects internal circuit faults and reports fault information to AC800M controller. Parameter configuration, protocol selection and diagnosis are completed by ABB Control Builder M engineering software.

Installation Requirement Plug‑in installation on the rear expansion slot of AC800M CPU unit. Strictly separate serial communication cables and high‑power power cables. Ensure reliable cabinet protective grounding. After module replacement, confirm full part‑number COM0003 / 2RAA005844A0006A matches original project configuration, download complete controller configuration file. Perform serial‑port wiring check, communication parameter matching and point‑to‑point data‑interaction test. Different hardware/firmware revisions cannot be directly interchanged without configuration adaptation. Do not put into service until no hardware self‑diagnosis fault alarm exists.

Typical Application Scenarios Serial‑communication‑expansion spare‑part for ABB AC800M automation control systems; widely used for docking with Modbus instruments, drives and protection devices in thermal‑power plants, hydropower plants and petrochemical industries; used for DCS‑PLC system maintenance and spare‑part replacement.

Key Features

1. Dedicated rear‑slot serial expansion module for AC800M, no extra rack slot occupied.
2. Dual‑interface design: RS232 and isolated RS422/485, support Modbus RTU master/slave mode.
3. 2.5 kV isolated RS485 port, good anti‑interference performance for industrial strong‑interference site.
4. Support user‑defined custom protocol, convenient for docking old‑style non‑standard field devices.
5. Strict full‑part‑number matching shall be observed during spare‑part replacement; cannot be substituted by other general‑purpose serial modules.