ABB Bailey NTRL02A | Remote I/O Termination Unit

This remote I/O termination unit provides field wiring termination for distributed I/O signals. It connects field devices to remote I/O modules in INFI 90 systems. The unit mounts on a DIN rail at remote locations.

Technical specifications

Parameter	Specification
Brand	ABB Bailey
Model	ABB Bailey NTRL02A
Product Family	INFI 90
Category	Remote I/O Termination Unit
Number of Channels	32 (thirty-two) termination points
Terminal Type	Screw clamp (fixed)
Wire Gauge	24 to 14 AWG
Voltage Rating	250V AC / 30V DC maximum
Current Rating	2A per terminal
Signal Types	Digital I/O, analog I/O, pulse inputs
Connector Type (I/O side)	4 x 20-pin ribbon cable headers
Connector Type (Field side)	32 x screw terminals (2 per channel)
Component Count	1 PCB, 32 terminal blocks, 4 ribbon connectors
Status Indicators	None (passive device)
Power Supply	None (passive termination)
Dimensions (L x W x H)	Approx. 22 cm x 12 cm x 5 cm
Weight	Approx. 0.5 kg
Energy Storage	None (no battery or capacitor)
Operating Temperature	-20°C to 70°C
Mounting	DIN rail (EN 50022)
Compatible Modules	NCIO, NCIS, SPRIO series remote I/O modules

Detailed Technical Analysis

This remote termination unit provides thirty-two screw terminal pairs for field wiring. Four ribbon cables connect the unit to the remote I/O module. The passive design contains no active electronic components or status indicators. Each terminal accepts wire sizes from 24 to 14 AWG.

Now let us examine its construction features. The unit uses fixed screw terminal blocks for reliable field connections. Four 20-pin ribbon cable headers link to the remote I/O module above. The board contains only passive traces and connector components. This termination unit requires no external power supply for operation.

This remote unit weighs 0.5 kilograms for stable DIN rail mounting. Its wide temperature range from -20°C to 70°C suits harsh environments. The ABB Bailey NTRL02A serves remote I/O termination for digital, analog, and pulse signals. The passive design ensures long-term reliability with no maintenance needs.

Installation and Wiring Guidelines

You mount this unit on a standard DIN rail in a remote control cabinet. Connect the ribbon cables from the remote I/O module to the 20-pin headers. Wire each field device to its designated screw terminal pair. Use ferrule-terminated wires for reliable screw clamp connections.

Label each channel clearly for easy identification during troubleshooting. Keep field wiring separate from high-voltage AC cables to reduce noise. The passive design requires no configuration or addressing at startup. Always power down the remote I/O module before connecting or disconnecting ribbon cables.

Practical Applications

Engineers use this termination unit for INFI 90 remote I/O system expansion. It organizes field wiring at distributed locations throughout the plant. This component also works in legacy DCS retrofit projects. Its 32 channels suit large remote I/O termination requirements.

Summary of Features

To conclude, this remote termination unit provides 32 screw terminal channels for field wiring. It weighs 0.5 kilograms and requires no external power. Choose ABB Bailey NTRL02A for reliable remote I/O termination in INFI 90 systems.