Allen-Bradley 1746-INT4 SLC 500 Isolated Thermocouple Input Module

Overview
The 1746-INT4 is an isolated thermocouple input module for the Allen-Bradley SLC 500 series, offering precise analog signal acquisition from multiple thermocouple types and mV inputs. It ensures reliable data acquisition with linearization and cold junction compensation.

Technical Specifications

• Manufacturer: Allen-Bradley

• Product Line: SLC 500

• Part Number: 1746-INT4

• Module Type: Isolated Thermocouple/mV Analog Input Module

• Weight: 1.00 lbs (0.45 kg)

• Inputs: Four (4) isolated channels

• Thermocouple Types: C, D, J, K, T, E, R, S, B, N

• mV Signal Inputs: –50…50 mV DC, –100…100 mV DC

• Backplane Current: 110 mA @ 5 VDC; 85 mA @ 24 VDC

• Bandwidth: 8 Hz

• Resolution: 16 bits

• Thermocouple Linearization: IPTS–68, NBS MN–125, NBS MN–161

• Cold Junction Compensation Accuracy: ±1.5 °C from 0–70 °C (32–158 °F)

• Step Response: 100 ms in, 2.5 ms out

• Open-Circuit Detection: Upscale, downscale, or zero; typical 5 s

• Update Time: 500 ms

Features

• Supports isolated measurements for four independent channels

• Accurate thermocouple signal conversion with linearization standards

• Built-in cold junction compensation ensures measurement stability

• Detects open-circuit conditions on input channels

• Compact design for SLC 500 chassis integration

Applications

• Industrial process temperature monitoring

• Integration with SLC 500 PLCs for thermal control

• Data logging and analog signal acquisition from multiple sensor types

FAQs

Q: Which thermocouple types are supported by this module?
A: Type C, D, J, K, T, E, R, S, B, and N.

Q: What is the resolution and accuracy for thermocouple inputs?
A: The module provides 16-bit resolution and ±1.5 °C accuracy with IPTS–68 linearization.