Buy 1756-IT16 Allen-Bradley ControlLogix 16-Pt Thermocouple Module

Product Overview

The 1756-IT16 is a high-density 16-point non-isolated thermocouple and millivolt input module engineered by Allen-Bradley / Rockwell Automation within the ControlLogix series. This module provides precise temperature measurement across diverse industrial sensors. Global PLC Spare HUB's Insight emphasizes that utilizing 24-bit data resolution with built-in ITS-90 linearization algorithms ensures minimal drift across multi-channel thermal monitoring networks.

Technical Specifications

• Brand / Manufacturer: Allen-Bradley / Rockwell Automation
• Series: ControlLogix
• Part Number: 1756-IT16
• Module Type: High-density non-isolated analog thermocouple/mV input
• Channel Count: 16 non-isolated channels supporting B, C, E, J, K, N, R, S, T types and mV
• Input Range: -100 to +100 mV (Max 5 Volt-Amps)
• Data Resolution: 24-bit analog-to-digital conversion
• Current Draw: 200 mA at 5.1 VDC; 80 mA at 24 VDC
• Isolation Voltage: 250 V continuous isolation rating
• Operating Temperature: 0 °C to 60 °C (32 °F to 140 °F)

Installation Guide

• Chassis Insertion: Seat the 1756-IT16 module into any available slot in a ControlLogix chassis, securing the top and bottom latching mechanisms.
• CJC Sensor Wiring: Install separate 1756-CJC cold junction compensation sensors onto the removable terminal block to ensure accurate thermocouple reference tracking.
• Shielded Cabling: Terminate thermocouple extension wire shields to chassis ground to mitigate electromagnetic interference in high-noise environments.

Debugging and Maintenance Convenience

• Status Display: Observe front-panel LED indicators to verify module health, backplane communication, and channel scanning activity.
• Open-Circuit Detection: Leverage controller configuration tags to instantly identify broken thermocouple wires or open-loop conditions across all 16 channels.
• Backplane Current Monitoring: Verify that rack power supplies easily accommodate the 200 mA (5.1 VDC) and 80 mA (24 VDC) module draw requirements.

Compatibility & Diagnostics

• System Compatibility: Fully compatible with ControlLogix controllers running RSLogix 5000 or Studio 5000 automation engineering environments.
• Diagnostic Capability: Provides high-speed fault detection for overrange, underrange, and open-circuit conditions per individual channel.
• Global PLC Spare HUB Review: Process control engineers note that the 24-bit resolution eliminates quantization errors common in legacy 16-bit temperature cards during high-precision thermal profiling.

Typical Application Scenarios

• Furnace Temperature Profiling: Multi-zone heat treating furnaces requiring dense thermocouple aggregation.
• Chemical Reactor Monitoring: Tracking exothermic reaction temperatures across multiple internal catalyst bed levels.
• Power Generation Turbines: Exhaust gas temperature (EGT) monitoring on heavy industrial gas turbines.

Certifications, Logistics, and Warranty

• Certifications: Certified to CE, c-UL-us, RCM, Ex, KC, EAC, and IECEx global industrial compliance standards.
• Logistics & Dispatch: Fast 24-48 hour dispatch window utilizing reliable international carriers including FedEx, UPS, and DHL.
• Warranty Terms: Covered by a comprehensive 12-month warranty from the date of acquisition.
• Packing List: One 1756-IT16 input module and safety guideline document (terminal block and CJC sensors sold separately).

Frequently Asked Questions (FAQ)

Q: Why are temperature readings drifting on the 1756-IT16 module channels?

A: Drift typically occurs if the external 1756-CJC cold junction compensation sensors are improperly mounted, missing, or exposed to localized drafts.

Q: Can this non-isolated module accept grounded and ungrounded thermocouples simultaneously?

A: Because the channels are non-isolated, mixing grounded and ungrounded thermocouples can introduce ground loops and measurement errors; matching sensor types is strongly recommended.

Q: How do I configure thermocouple linearization types in the programming software?

A: Select the 1756-IT16 module properties in Studio 5000 and choose the exact thermocouple type (e.g., J, K, T) for each individual channel configuration tab.

Q: What happens to channel readings if an input signal exceeds the ±100 mV limit?

A: The channel will flag an overrange status bit in the controller data table, protecting downstream logic from corrupted calculations.

Q: Purchasing Guidance: What accessories must be ordered alongside this module?

A: You must separately purchase a compatible Removable Terminal Block (RTB) and required 1756-CJC cold junction compensation sensors to make the module operational.

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