Product Summary
The 1746-INT4 Isolated Thermocouple/mV Input Module integrates directly into your SLC 500 system. It converts analog signals from thermocouples or millivolt sources into digital data. This module supports ten thermocouple types and offers galvanic isolation for signal integrity.
Expert Technical Evaluation & Performance Review
This module delivers precise temperature readings for critical processes. It supports thermocouple types C, D, J, K, T, E, R, S, B, and N. The 1746-INT4 also accepts mV signals from -100 to 100 mV DC. This flexibility makes it suitable for many industrial applications.
The module uses a Sigma-Delta ADC for high-accuracy conversion. It provides a 16-bit resolution for detailed signal representation. The update time is 500 milliseconds for stable data output. An 8 Hz bandwidth filters out high-frequency electrical noise.
Channel-to-channel isolation protects your data from ground loops. The module offers 1000V transient isolation between channels and the backplane. This feature prevents electrical damage and signal corruption. It ensures reliable operation in harsh industrial environments.
Cold junction compensation delivers an accuracy of ±1.5 °C. This compensation works across a 0 to 70 °C ambient range. The module follows IPTS-68 and NBS standards for linearization. You can select temperature scales in °C or °F with 0.1 resolution.
The module includes five LED indicators for quick status checks. Four LEDs show the status of each input channel. One LED indicates the overall module health. This design simplifies troubleshooting and system monitoring.
Open-circuit detection enhances system safety and reliability. You can configure the module for upscale, downscale, or zero detection. The detection time is 5 seconds, typical for this system. This feature alerts operators to sensor failures immediately.
Step-by-Step User & Installation Guide
First, power down the entire SLC 500 chassis before installation. Remove the chassis cover to access the backplane slot. Align the 1746-INT4 module with the plastic guides in the slot. Slide the module firmly into place until it locks securely.
Next, connect your thermocouple or mV sensor wires to the terminal block. The module requires field calibration after installation. You must calibrate the module at least once every year. Use a precision temperature source for accurate calibration.
Configure the input type for each channel using your programming software. Select the correct thermocouple type or mV range for your sensor. Set the open-circuit detection behavior to upscale, downscale, or zero. Choose the temperature scale and resolution for your application.
The module draws 110 mA at 5V DC and 85 mA at 24V DC. Ensure your chassis power supply can handle this load. The total backplane power rating is 0.6 Watts. Verify your system's power budget before adding this module.
Operate the module within its environmental limits for best performance. The operating temperature range is 0 to 60 °C. The humidity range is 5 to 95 percent non-condensing. The module holds CE, CSA, and UL certifications for safety.
Logistics & Standard Packaging Details
- One (1) Allen-Bradley 1746-INT4 SLC 500 Isolated Thermocouple/mV Input Module
- One (1) Removable terminal block for wiring connections
- One (1) Installation and user manual
- The module ships in an anti-static protective package
- Express delivery shipping is available via FedEx, UPS, and DHL
