ABB Bailey IMLMM02 | Logic Master Module

This logic master module executes complex control strategies for INFI 90 systems. It processes ladder logic, sequential functions, and regulatory control loops. The unit mounts in any INFI 90 rack slot as a standalone controller.

Technical specifications

Parameter	Specification
Brand	ABB Bailey
Model	ABB Bailey IMLMM02
Product Family	INFI 90
Category	Logic Master Module
Processor Type	32-bit microcontroller
Processor Speed	66 MHz
Program Memory	2 MB Flash
Data Memory	1 MB RAM (battery-backed)
Retentive Memory	128 KB EEPROM
Execution Speed	0.3 ms per 1K logic
Communication Ports	2 x RS-232, 2 x RS-485
Network Protocol	INFI Net, MODBUS RTU
Component Count	Approximately 145 components
Integrated Circuits	22 ICs (CPU, memory, drivers)
Power Supply	24V DC external
Current Consumption	350 mA typical
Status Indicators	6 x LEDs (PWR, RUN, TX, RX, FLT, BAT)
Test Points	8 gold-plated test points
Energy Storage	1 x lithium battery (RAM backup)
Battery Type	3.6V lithium
Battery Life	Approximately 3 years
Dimensions (L x W x H)	Approx. 24 cm x 12 cm x 3.5 cm
Weight	Approx. 0.52 kg
Operating Temperature	0°C to 55°C
Mounting	INFI 90 rack slot

Detailed Technical Analysis

This logic master module uses a 32-bit processor running at 66 MHz. It executes 1K of logic instructions in just 0.3 milliseconds. The board stores its control program in 2 MB of flash memory. It uses another 1 MB of battery-backed RAM for dynamic data storage.

Now let us examine its communication capabilities. This module includes two RS-232 ports for local programming and diagnostics. It also provides two RS-485 ports for INFI Net and MODBUS networking. Approximately 145 components populate both sides of the circuit board. Twenty-two integrated circuits include the main CPU and memory chips.

This logic module draws 350 milliamps from a 24V DC external supply. Six LEDs show power, run, transmit, receive, fault, and battery status. Eight gold-plated test points allow signal monitoring during commissioning. A lithium battery preserves RAM contents for up to three years without power.

Installation and Configuration Guidelines

You insert this module into any available INFI 90 rack slot. Connect the 24V DC power supply to the designated terminals. Attach communication cables to the RS-232 and RS-485 ports as needed. The module automatically boots upon power application.

Configure the control program using ABB Bailey engineering software. Download the configuration through the RS-232 programming port. The module stores all parameters in non-volatile flash memory. Replace the lithium battery every three years to prevent data loss.

Practical Applications

Engineers use this logic module for INFI 90 system upgrades and expansion. It handles complex batch processes and sequential control applications. This component also works in legacy DCS retrofit projects. Its 66 MHz speed suits demanding logic-intensive processes.

Summary of Features

To conclude, this logic master module executes 1K logic in 0.3 milliseconds. It weighs 0.52 kilograms and includes 2 MB of flash memory. Choose ABB Bailey IMLMM02 for reliable logic control in INFI 90 systems.