ABB Bailey NTRB01 Transfer Module | Redundant Bus Switch

Module Overview

This transfer module switches between redundant communication buses automatically. You can install ABB Bailey NTRB01 directly into INFI 90 controller racks. The unit monitors both primary and backup bus activity continuously. It transfers network traffic when detecting a primary bus failure.

Technical Specifications

Parameter	Value
Dimensions (W x H x D)	233 mm x 160 mm x 20 mm
Weight	0.43 kg
Bus interfaces	2 fiber optic (primary), 2 fiber optic (backup)
Connector type	ST duplex (4 total ports)
Transfer type	Automatic with manual override
Switchover time	< 2 ms after fault detection
Monitoring method	Heartbeat and CRC checking
Supported data rate	1.5 Mbps to 10 Mbps
Status indicators	8 LEDs (bus A/B active, fault, transfer)
Manual controls	2 push-buttons (bus select)
Interface to backplane	INFI 90 VME connector
Power consumption	5V DC at 0.8A
Total onboard components	224 discrete parts
Energy storage type	Tantalum and electrolytic capacitors
Energy storage rating	470 µF at 16V DC
Operating temperature	0°C to +55°C

Board Layout and Components

The PCB places four fiber optic transceivers on the front panel edge. A dedicated logic circuit monitors both bus pairs continuously. Moreover, 224 discrete components include switching relays and fault detection circuits. Tantalum capacitors filter noise on all communication transceivers. Consequently, the module transfers buses cleanly without data corruption.

Installation Process

You can mount ABB Bailey NTRB01 into any standard INFI 90 VME rack slot. The backplane connector supplies power and signals bus status to the controller. Furthermore, front panel ST ports connect to primary and backup fiber cables. Two push-buttons allow manual bus selection during maintenance.

Performance Advantages

This module switches between redundant buses in under 2 milliseconds. The automatic transfer activates when CRC errors exceed a configurable threshold. Therefore, network communication continues without operator intervention. The manual override also allows safe testing of backup bus paths.

Safety and Compliance

ABB Bailey NTRB01 meets CE and RoHS industrial standards. The board discharges stored energy below 3V within five seconds. Hence, technicians face minimal electrical risk during installation or replacement.