ABB Bailey NDSM01 I/O Digital Slave Module

This I/O digital slave module provides remote discrete I/O expansion for INFI 90 systems. The ABB Bailey NDSM01 connects to a master controller through a dedicated serial communication link. Sixteen digital input channels and eight digital output channels reside in one compact enclosure. Consequently, plant engineers can locate I/O near field devices without long cable runs.

Technical Specifications of the I/O Digital Slave Module

The ABB Bailey NDSM01 measures 140 mm in width and 210 mm in height. Its depth reaches 60 mm for DIN rail or panel mounting. The module weighs approximately 0.95 kg including all I/O and communication circuitry. A single front panel LED array shows communication status, power, and per-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	NDSM01
Category	I/O Digital Slave Module
Dimensions (W x H x D)	140 mm x 210 mm x 60 mm
Weight	Approximately 0.95 kg
Digital Inputs	16 channels, 24V DC
Digital Outputs	8 channels, 24V DC, 0.5A each
Input Current	7 mA typical per channel
Output Protection	Short circuit and overcurrent
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 NDSM01 communicates with the master controller over distances up to 1200 meters. You can daisy-chain up to 31 slave modules on the same RS-485 link. The module automatically scans its sixteen inputs and updates outputs on every scan cycle. Each digital output channel includes thermal shutdown protection for overload conditions. Consequently, this slave module reduces field wiring costs for large distributed control systems.

Installation and System Integration

You must mount this digital slave module on standard 35mm DIN rail or a flat panel. The ABB Bailey NDSM01 requires a single 24V DC power supply for all field circuits. A shielded twisted-pair cable connects the module to the INFI 90 master controller. The module uses rotary switches for setting unique network addresses from 1 to 31. Always verify address settings before connecting multiple slaves to the same link.

Maintenance and Operational Benefits

Because the ABB Bailey NDSM01 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 prevents accidental contact with live field wires. Consequently, this digital slave module offers reliable remote I/O service for discrete control applications.