Buy now: Allen-Bradley 1756-IT6I ControlLogix Isolated Thermocouple Module
Atlantechdrives provides you the 1756-IT6I, a premium 6-channel analog temperature input module featuring individual point-to-point isolation. This module is the gold standard for high-accuracy temperature control in power plants, metal processing, and pharmaceutical labs where ground loops and electrical interference are constant risks.
- Channels: 6 Individually Isolated Thermocouple/mV inputs
- Isolation: 100% Channel-to-Channel and Channel-to-Backplane
- Resolution: 16-bit (approx. 0.01° increments)
- Thermocouples: Supports types J, K, T, E, R, S, B, N, L, C
- Digital Filtering: 50Hz and 60Hz Notch filters
The Advantage of Individual Isolation: 1756-IT6I
The 1756-IT6I is engineered for reliability in electrically «noisy» environments. By providing 100% individual isolation for each of its six channels, it prevents a ground loop on one sensor from affecting the readings of the others. This is critical in applications where thermocouples are attached to large grounded metal structures or immersed in conductive fluids. The IT6I also features advanced onboard diagnostics, including «Open Wire» and «Over Range» detection. Its 16-bit resolution ensures that even the most subtle temperature shifts are captured, making it ideal for PID control loops where stability is paramount.
Expert Tips: CJC Installation and Accuracy
To maintain the precision of the 1756-IT6I, the Cold Junction Compensation (CJC) thermistors must be installed correctly in the terminal block. These thermistors measure the temperature at the connection point to compensate for the secondary voltage created where the thermocouple meets the copper terminals. If these are missing or damaged, your readings will be inaccurate by exactly the difference between the cabinet temperature and the reference temperature. For maximum noise immunity, we recommend using the 50Hz/60Hz notch filter settings in the software to eliminate interference from the local power grid.
Maintenance and Hardware Longevity
The 1756-IT6I is a high-reliability module, but the terminal block (1756-TBNH or TBSH) should be inspected annually for tight connections. Thermal cycling in industrial cabinets can occasionally loosen screw terminals, leading to signal drift. Because this module provides individual isolation, troubleshooting is simplified: you can probe an individual channel with a millivolt generator without disconnecting the other sensors. Keeping the module’s front faceplate clean ensures that the 6 status LEDs are visible for quick diagnostic checks during routine walkthroughs.
FAQs
Q: What is the main difference between IT16 and IT6I?
A: The IT6I provides individual channel-to-channel isolation, whereas the IT16 only offers group isolation. The IT6I is more robust against ground loops.
Q: Does it support millivolt signals?
A: Yes, it can be configured for ±100mV range, useful for specialized scientific instruments.
Do you need more references from this brand? Explore our full catalog of Allen-Bradley here.
This isolated thermocouple module offers high noise immunity for sensitive environments, fitting perfectly into a 1756-A7 medium-sized chassis.
