Configured for high-density thermocouple signal acquisition in ControlLogix platforms, the Allen-Bradley 1756-IT16 (1756-IT16 Analog Input Module) provides direct physical/electrical execution.

Model Designation & Architecture

The Allen-Bradley 1756-IT16 operates as a non-isolated, 16-channel analog input assembly designed for chassis-based integration. The part number designates a 16-point thermocouple/millivolt input card compatible with standard ControlLogix local or remote I/O chassis configurations.

Technical Data Summary

Deterministic Backplane & EtherNet/IP Bus Performance

The module interfaces directly with the ControlLogix backplane bus, utilizing producer/consumer architecture to optimize communication velocity. It processes high-resolution 24-bit analog data with minimal system latency, ensuring synchronous updates across EtherNet/IP deterministic networks. High I/O density scaling allows 16 millivolt/thermocouple points to occupy a single chassis slot, reducing total physical footprint. Firmware flash compatibility enables seamless updates over the backplane without physical removal of the module structure.

Component Delivery Manifest

• 1 x 1756-IT16 Analog Input Module
• 1 x Original Manufacturer ESD Protective Sleeve
• 1 x Factory Inspection Certificate

Mounting & Wiring Instructions

• Turn off chassis power before installing or removing non-RIUP compatible components, or ensure the environment is non-hazardous.
• Align the module card depth guides with the top and bottom chassis slots until the retention latches engage firmly.
• Route non-isolated thermocouple and millivolt field wiring using shielded twisted-pair cables to prevent electromagnetic interference.
• Ground all cable shields at a single point, typically at the chassis ground busbar, to eliminate ground loop current paths.
• Maintain separation between low-level millivolt signal wiring and high-voltage AC or inductive load field lines.

Technical Reference FAQ

• What is the total current draw of the 1756-IT16 from the backplane?

  The module draws 200 mA at 5.1 VDC and 80 mA at 24 VDC from the backplane bus, yielding a total backplane power consumption of approximately 2.94 W.

• Does the 1756-IT16 provide channel-to-channel isolation?

  No, the 1756-IT16 features 16 non-isolated channels. Group isolation between the inputs and the backplane is rated for 250 V continuous.

• What input signal range does this module accept?

  The module accepts millivolt input signals spanning -100 to 100 mV DC, optimized for low-voltage sensor processing such as thermocouple connections.

• What is the internal data resolution for input channels?

  The 1756-IT16 utilizes an analog-to-digital converter capable of 24-bit resolution across its operating range.

• How is status monitoring displayed on the physical module?

  The front panel includes a status LED display providing visual indication of module health, communication activity, and channel fault conditions.

• Can the 1756-IT16 be installed while the chassis is powered?

  Removal and Insertion Under Power (RIUP) is supported by ControlLogix chassis, provided the area is known to be non-hazardous.

• What thermal constraints apply to field cable termination?

  Because the module processes low-level millivolt signals, wiring terminals must be kept at a uniform ambient temperature to minimize cold junction compensation drift.

• What enclosure rating applies to the 1756-IT16 assembly?

  The module is rated as open-style apparatus and must be installed inside an industrial enclosure providing suitable environmental protection.