Allen-Bradley 1746-IV16/C Digital Input Module

The Allen-Bradley 1746-IV16/C, also cataloged as the 1746-IV16/C digital input module, operates as a dedicated hardware interface for 24 V DC discrete signal acquisition within SLC 500 backplane I/O architectures. The module processes 16-point sinking input signals and transfers state data through the controller backplane bus for deterministic scan execution.

Suffix Breakdown & Model Matrix

No formal suffix segmentation structure is defined for this model. The 1746-IV16/C is treated as a single discrete catalog identifier within the SLC 500 I/O module family.

Hardware Specifications

Allen-Bradley SLC 500 Backplane I/O Architecture Characteristics

Within SLC 500 systems, I/O modules such as the 1746-IV16/C interface directly with the chassis backplane, where cyclic data exchange is governed by backplane bus communication timing and scan sequencing. The module supports fixed-point digital mapping aligned with controller scan cycles, ensuring deterministic state transfer. Channel grouping is handled at the module level without per-channel parameterization, and firmware-level compatibility is tied to SLC 500 chassis and processor revision alignment.

Frequently Asked Questions (FAQ)

Q: Can the 1746-IV16/C be hot-swapped during system operation?
A: No. The SLC 500 architecture does not support hot-swap insertion for discrete I/O modules. Power must be removed from the chassis before module replacement.

Q: What is the backplane load contribution of this module?
A: The module draws approximately 120 mA at 5 V DC from the backplane, which must be included in chassis power budget calculations.

Q: Is this module compatible with CompactLogix or ControlLogix platforms?
A: No direct compatibility exists. Integration requires migration or interface through supported Rockwell I/O conversion strategies.

Field Installation Guidelines

Install the module in an SLC 500-compatible chassis with verified backplane power capacity. Ensure 24 V DC field wiring is isolated from control wiring and routed with proper shielding for noise immunity. Maintain minimum conductor separation from high-voltage lines. Ground the chassis according to panel grounding standards using a single-point earth reference. Terminal blocks must be fully seated to ensure stable sinking input behavior. Avoid mechanical stress on backplane connectors during insertion or removal.