The Allen-Bradley 1746-NT4, also cataloged as the 1746-NT4 Thermocouple Input Module, operates as a dedicated hardware component for thermocouple signal acquisition and temperature measurement within the SLC 500 control system platform.

Model Identification

The 1746-NT4 is a 4-channel thermocouple input module designed for Allen-Bradley SLC 500 programmable controllers. It converts thermocouple millivolt signals into digital values for PLC processing. The module supports multiple thermocouple types and analog input ranges.

Hardware Specifications

Industrial Control Interface Characteristics

The 1746-NT4 integrates into the SLC 500 backplane architecture and transfers converted temperature data to the processor through the controller bus interface. The module is configured through PLC software parameters for thermocouple type selection and input scaling.

The SLC 500 platform uses a modular I/O structure where analog input density can be expanded by adding compatible modules within the chassis configuration. The 1746-NT4 provides 4 thermocouple measurement channels for temperature monitoring applications requiring direct millivolt signal conversion.

Ordering Information

• 1 x Allen-Bradley 1746-NT4 Thermocouple Input Module
• Module type: 4-channel thermocouple analog input
• Compatible spare models:
  • 1746-NT4/A
  • 1746-NT4/B
  • 1746NT4

Field Installation Guidelines

• Install the module in a compatible Allen-Bradley SLC 500 chassis slot.
• Verify chassis power is removed before module insertion or removal.
• Use shielded thermocouple wiring where electrical noise may affect millivolt measurements.
• Keep thermocouple signal wiring separated from high-current motor and power cables.
• Confirm thermocouple type configuration matches the connected field sensor.
• Connect cable shields according to the grounding practice defined for the control cabinet.

Frequently Asked Questions

• What type of input signals does the 1746-NT4 accept?

The module accepts thermocouple millivolt signals and supports Type B, E, J, K, N, R, S, and T thermocouple inputs.

• How many temperature channels are available?

The 1746-NT4 provides 4 independent thermocouple input channels for temperature measurement.

• Is the 1746-NT4 compatible with SLC 500 controllers?

Yes. The module is designed for installation in Allen-Bradley SLC 500 chassis systems.

• Does the module provide analog signal conversion?

Yes. The module converts thermocouple millivolt signals into digital data values for PLC processing.

• What input voltage ranges are supported?

The module supports thermocouple signal ranges of 50 mV and 100 mV.

• Can different thermocouple types be connected simultaneously?

Configuration requirements should be verified before operation. Each channel must match the connected thermocouple sensor type.

• Does the module support hot swapping?

The module should not be inserted or removed from an energized chassis. Power removal is required before installation changes.

• What wiring practices are recommended?

Use appropriate thermocouple extension wiring, maintain signal separation, and apply cabinet grounding practices to reduce electrical interference.