ABB Bailey NASM02E Analog Slave Module

This analog slave module provides remote I/O expansion for ABB Bailey INFI 90 systems. The ABB Bailey NASM02E connects to a master controller through a dedicated serial link. Eight analog input channels accept 4-20mA signals from field transmitters and sensors. Consequently, plant engineers can locate I/O near field devices without long cable runs.

Technical Specifications of the Analog Slave Module

The ABB Bailey NASM02E measures 120 mm in width and 200 mm in height. Its depth reaches 55 mm for DIN rail or panel mounting. The module weighs approximately 0.82 kg including all analog and communication circuitry. A single front panel LED array shows communication status, power, and channel activity. The top side features a 9-pin D-sub connector for the master link and two conduit entries. This design stores minimal energy in small filtering capacitors only. Therefore, the module contains no batteries or large energy storage elements.

Parameter	Specification
Brand	ABB Bailey
Full Model	NASM02E
Category	Analog Slave Module
Dimensions (W x H x D)	120 mm x 200 mm x 55 mm
Weight	Approximately 0.82 kg
Analog Inputs	8 channels, 4-20mA
Analog Outputs	2 channels, 4-20mA
Resolution	12-bit
Accuracy	±0.2% of full scale
Communication Link	RS-485 serial (19.2 kbaud)
Communication Port	9-pin D-sub
Terminal Type	Screw blocks inside enclosure
Energy Storage	Minimal (filtering only)
Supply Voltage	24V DC external
Enclosure Rating	IP20

Functional Features and Remote I/O Capability

The ABB Bailey NASM02E communicates with the master controller over distances up to 1200 meters. You can daisy-chain multiple slave modules on the same RS-485 link. The module automatically scans its eight analog inputs and reports changes on every scan cycle. Each 4-20mA output channel provides loop power for externally powered transmitters. Consequently, this slave module reduces field wiring costs for large distributed processes.

Installation and System Integration

You must mount this analog slave module on standard 35mm DIN rail or a flat panel. The ABB Bailey NASM02E requires a single 24V DC power supply for operation. A shielded twisted-pair cable connects the module to the INFI 90 master controller. The module uses rotary switches for setting unique network addresses. Always verify address settings before connecting multiple slaves to the same link.

Maintenance and Operational Benefits

Because the ABB Bailey NASM02E stores no battery-backed data, it needs no periodic battery changes. Technicians can replace the module without losing any configuration settings. The sealed screw terminal cover protects field wiring from accidental contact. Consequently, this slave module offers reliable remote I/O service for analog monitoring applications.