ABB Bailey IIMGC04 Controller Module

Processing Core and Memory Architecture

The ABB Bailey IIMGC04 serves as a powerful controller for Bailey distributed control systems. This module executes logic programs and handles real-time data processing. A 32-bit microprocessor runs at 25 MHz for reliable operation. The controller manages both analog and digital I/O points across the network.

Technical Specifications

Parameter	Specification
Model	IIMGC04
Category	Controller Module
Height	310 mm
Width	45 mm
Depth	250 mm
Weight	1.25 kg
Processor	32-bit MC68020 at 25 MHz
RAM	4 MB static RAM
Flash Memory	2 MB flash EPROM
Communication Ports	2 x RS-232, 1 x RS-485
Status Indicators	4 LEDs (PWR, RUN, ERR, BAT)
Internal Components	1 CPU board, 1 memory board, 1 battery, 1 heatsink
Energy Storage	2400 mAh lithium battery

Internal Components and Energy Storage

The IIMGC04 contains two separate circuit boards inside its housing. One CPU board carries the 32-bit processor and support chips. One memory board provides 4 MB of RAM and 2 MB of flash storage. A 2400 mAh lithium battery preserves the RAM content during power loss. This battery retains program logic and process data for up to six years. An aluminum heatsink dissipates heat from the processor efficiently. The ABB Bailey IIMGC04 also includes four status LEDs on the front panel.

Communication Interfaces and Connectivity

This controller module offers three serial ports for external communication. Two RS-232 ports connect to programming terminals or local HMIs. One RS-485 port supports multi-drop connections to remote I/O racks. The IIMGC04 communicates with up to 64 field devices on the RS-485 network. You can configure each port’s baud rate independently through software.

Physical Dimensions and Installation Guidelines

The ABB Bailey IIMGC04 weighs 1.25 kilograms for stable rack mounting. Its height measures 310mm, width 45mm, and depth 250mm. Install this controller in a dedicated slot near the power supply. Leave 50mm of clearance above and below for proper airflow. Apply 5 V DC and 24 V DC power from the backplane connections. The IIMGC04 operates reliably from 0°C to +55°C ambient temperature. It consumes 8.5 watts of power under full processing load.