Purchase now: Allen-Bradley 1756-IT16 ControlLogix Thermocouple Module
Atlantechdrives provides you the 1756-IT16, a high-density 16-channel thermocouple input module for the ControlLogix system. This module is the ideal solution for large-scale temperature monitoring applications where multiple thermal sensors must be integrated into a single chassis slot, providing excellent cost-per-point efficiency without compromising performance.
- Channels: 16 Thermocouple / mV inputs
- Thermocouple Types: B, C, E, J, K, N, R, S, T, L, TXK/XK (L)
- Resolution: 16-bit (Digital-to-Analog)
- CJC: Integrated Cold Junction Compensation (requires RTB)
- Scanning: RPI as fast as 10ms
Technical Performance: High-Density Thermal Sensing
The 1756-IT16 is engineered for stability in complex process environments. It features a sophisticated analog-to-digital converter that supports a wide array of thermocouple types, making it highly versatile for glass manufacturing, heat treatment, and chemical reactors. The module performs internal linearization and digital filtering to ensure that the temperature data transmitted to the ControlLogix CPU is accurate and free from high-frequency electrical noise. With 16 channels, the IT16 allows for extensive thermal mapping of machinery while occupying minimal backplane space. It also supports millivolt (mV) mode, allowing it to act as a general-purpose low-voltage analog input for specialized instrumentation.
Installation Advice: CJC and Wiring Discipline
When installing the 1756-IT16, the most critical factor is the Cold Junction Compensation (CJC). You must use the 1756-TBNH or TBSH terminal block with the CJC sensors correctly installed at the terminal interface. Without accurate CJC, the thermocouple readings will drift significantly as the ambient temperature inside the cabinet changes. Additionally, always use the correct thermocouple extension wire (compensated wire) to connect your sensors. Using standard copper wire will create unintended cold junctions at the terminal block, leading to substantial measurement errors. For optimal noise rejection, ensure that the thermocouple shields are grounded at a single point and that the signal wires are kept away from AC power cables.
Maintenance and Signal Calibration
The 1756-IT16 is a solid-state module, but thermocouple sensors are prone to «aging» and oxidation. Maintenance should include a yearly software-based calibration check. Use the Studio 5000 diagnostic tags to monitor for «Open Wire» detection; the 1756-IT16 can detect a broken thermocouple and flag a fault before it causes a process failure. If you observe inconsistent readings across multiple channels, check the chassis ground potential. Because this module is non-isolated between channels (it features group-to-backplane isolation), a ground loop on one sensor can potentially affect the readings of others in the same group.
FAQs
Q: Can I mix different thermocouple types on the 1756-IT16?
A: Yes, each channel is individually software-configurable for different types (e.g., Type K on channel 0 and Type J on channel 1).
Q: Does the 1756-IT16 support RTDs?
A: No, for RTDs you would need the 1756-IRT8I or similar modules.
Do you need more references from this brand? Explore our full catalog of Allen-Bradley here.
This 16-channel thermocouple input card ensures stable thermal monitoring; for long-term data retention, ensure your CPU uses a 1756-BA2 energy storage module.
