ABB Bailey IMRDI11 Digital Input Module

This digital input module monitors discrete field signals for ABB Bailey INFI 90 systems. The ABB Bailey IMRDI11 accepts up to sixteen independent 24V DC inputs from sensors and switches. Each channel provides optical isolation to protect the backplane from electrical noise. Consequently, plant engineers can connect limit switches, push buttons, and proximity sensors reliably.

Technical Specifications of the Digital Input Module

The ABB Bailey IMRDI11 measures 180 mm in width and 240 mm in height. Its depth reaches 45 mm for standard INFI 90 rack mounting. The module weighs approximately 0.55 kg including all input and isolation circuitry. A single front panel LED array shows the on-off status for each input channel. The front side features a removable screw terminal block for field wiring connections. 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	IMRDI11
Category	Digital Input Module
Dimensions (W x H x D)	180 mm x 240 mm x 45 mm
Weight	Approximately 0.55 kg
Input Channels	16 independent inputs
Input Voltage Range	18-30V DC (24V DC nominal)
Input Current	7 mA typical per channel
Isolation	1500V AC optical per channel
Response Time	2 ms typical
Input Filter	Programmable 1-10 ms
Terminal Type	Removable screw blocks
Energy Storage	Minimal (filtering only)
Supply Voltage	24V DC from backplane

Functional Features and Signal Processing

The ABB Bailey IMRDI11 includes programmable input filtering for noise rejection. You can configure each channel for sinking or sourcing field devices without jumpers. The module automatically reports change-of-state events to the controller immediately. Each input also features a green LED indicator for visual status verification. Consequently, maintenance teams can identify active inputs instantly without meters.

Installation and System Integration

You must install this digital input module into a standard INFI 90 rack slot. The ABB Bailey IMRDI11 connects to the backplane automatically upon full insertion. A removable terminal block accepts field wiring from 14 to 22 AWG. The module supports hot replacement without powering down the entire rack. Always verify sensor polarity before connecting devices to the input channels.

Maintenance and Operational Benefits

Because the ABB Bailey IMRDI11 stores no battery-backed data, it needs no periodic battery changes. Technicians can replace the module without losing any configuration settings. The transparent terminal cover prevents accidental contact with live field wires. Consequently, this input module offers safe and simple maintenance for INFI 90 control systems.