Allen-Bradley 1746-INT4 SLC 500 Isolated Thermocouple/Millivolt Analog Input

Description

 

The 1746-INT4 SLC 500 Thermocouple/mV Isolated Input Module by Allen-Bradley is an SLC 500 module which stores digitally-converted thermocouple and analog millivolt (mV) data for future retrieval by any SLC 500 processor. It has Four (4) input channels for Thermocouple and mV sensors. It has a backplane current of 110 mA at 5V DC and 85mA at 24V DC and an overall backplane power rating of 0.6W. It has Four (4) individually isolated input channels that are also isolated from the backplane and it uses a Sigma-Delta ADC modulation conversion method. It uses an analog filter with a low pass digital filter and has a normal rejection mode greater than 60 dB at 60 Hz between terminals. It also has a common rejection mode greater than 120dB between the inputs and chassis ground with 1kΩ imbalance and has an 8Hz channel bandwidth. The 1746-INT4 requires field calibration and must be calibrated at least once every year.

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Technical specifications

 

Part Number/Catalog No.：1746-INT4
Series：LC 500
Module Type：Isolated Thermalcouple/mV Analog Input Module
Backplane Current (5 Volts)：110 milliamps
Inputs：Four (4); Isolated
Backplane Current (24 Volts)：85 milliamps
Thermocouple sensors：Type C, D, J, K, T, E, R, S, B, and N
Bandwidth：8 Hertz
mV signal inputs：–50…50 mV dc –100…100 mV dc
Thermocouple Linearization：IPTS–68 standard, NBS MN–125, NBS MN–161
Cold junction compensation：Accuracy ±1.5 °C (34.7 °F), 0 … 70 °C (32…158 °F)
Open-circuit detection：Upscale, downscale, or zero
Step Response：100 milliseconds in, 2.5 milliseconds out
Backplane Current：110 mA @ 5VDC; 85 mA @ 24VDC
UPC：10612598169693
Open circuit detection time：5 s, typical
Update Time：500 milliseconds
Resolution：16 Bits

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1746-INT4 is a 4-channel isolated analog input module in the Allen-Bradley SLC 500 series, designed for high-precision signal acquisition and harsh industrial environments. The module supports multiple signal types, provides excellent anti-interference ability and electrical isolation between channels, and is ideal for process monitoring and equipment status monitoring.

1. High-precision signal acquisition and processing

The 1746-INT4 module supports multiple analog signal inputs such as ±10V, 0-10V, 4-20mA, and 16-bit high resolution ensures measurement accuracy of ±0.1% full scale. Its built-in signal conditioning circuit can automatically filter out noise, suitable for weak signal acquisition such as strain gauges and thermocouples, and is typically used in weighing systems and temperature monitoring.

2. Industrial-grade safety and reliability

The module adopts a full isolation design between channels (isolation voltage 1500Vrms), which effectively prevents ground loop interference and signal crosstalk. Certified for Class I Div 2 hazardous areas, it supports wide operating temperatures of -40°C to 70°C, meeting the harsh environmental requirements of industries such as petrochemicals and energy.

3. Flexible configuration and efficient maintenance
The RSLogix 500 software allows you to independently configure the signal type and range of each channel, and supports direct display of engineering units. The module provides LED channel status indication and disconnection detection functions, and with the live plug-in design, it greatly reduces system maintenance downtime.

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