Configured for high-precision voltage and current signal acquisition in PLC architectures, the Allen-Bradley 1746-NI4, also cataloged as the 1746NI4 Analog Input Module, provides direct physical/electrical execution.

Module Configuration and Variant Breakdown

• Platform Identifier: Allen-Bradley SLC 500 Series
• Catalog Identifier: 1746-NI4
• Base Part Number: 1746NI4
• Hardware Architecture: 4-Channel Differential Analog Input

Hardware Specifications

Backplane Communication and I/O Density Scaling

Engineered to operate within the rack-mounted SLC 500 chassis, the module communicates via the proprietary high-speed backplane bus. Deterministic data exchange rates synchronize with the CPU scan cycle to maintain predictable update times across all active channels. I/O density scaling relies on backplane register mapping, allowing seamless integration alongside digital and specialty cards without violating bus current limits or slot limitations.

Standard Scope of Delivery

• 1 x Allen-Bradley 1746-NI4 Analog Input Module
• 1 x Removable Terminal Block Connector
• 1 x Hardware Installation Manual

Physical Installation Procedures

• Chassis Insertion: Power down the rack before inserting the module into any available slot of the SLC 500 chassis, ensuring proper alignment with the backplane connector guide rails.
• Shield Grounding: Terminate all signal cable shields to the nearest chassis ground lug to suppress electromagnetic interference and high-frequency noise injection.
• Wire Stripping: Strip field wiring insulation back by 7 mm to ensure proper engagement within the removable terminal block clamp without exposed copper strands.

Frequently Asked Questions

• What is the channel configuration of this module?

  The module features four differential input channels supporting voltage and current signals.

• Does the module support hot-swapping in an active rack?

  No, hot-swapping is not supported; main rack power must be turned off prior to insertion or removal.

• What is the maximum voltage input supported?

  The unit accepts analog voltage inputs up to 10 VDC across its differential terminals.

• How is power supplied to the internal circuitry?

  Power is drawn directly from the SLC 500 rack backplane at 5 VDC and 24 VDC rails.

• What type of terminal connection is utilized?

  A removable terminal block is used for field wiring terminations to facilitate rapid maintenance replacement.

• What is the operating temperature range?

  The module functions reliably within an ambient temperature range of 0 deg C to 60 deg C.

• Are the channels galvanically isolated?

  Channels are single-ended relative to backplane common with differential inputs to reject common-mode noise.

• What is the total weight of the hardware?

  The module has a verified net weight of 0.3 kg excluding packaging materials.