Allen-Bradley 1746-OVP16 SLC 500 Digital DC Output Module

The Allen-Bradley 1746-OVP16, also cataloged as the 1746-OVP16 digital DC output module, serves as a 16-point sinking output interface for 20.4-26.4 VDC load switching within SLC 500 backplane-controlled architectures. The Allen-Bradley 1746-OVP16 (1746-OVP16 output module) provides direct electrical actuation of external DC loads through scan-synchronized SLC 500 chassis communication.

The module executes discrete output state transitions via the 5 VDC backplane logic rail while isolating field-side switching on the 20.4-26.4 VDC output domain. Each channel operates as a current sinking output element designed for high-current DC load control.

Hardware Specifications

SLC 500 Backplane Communication and I/O Density Scaling Behavior

The 1746-OVP16 operates under deterministic SLC 500 backplane scan cycles where output image table updates are latched at processor scan completion. The 5 VDC backplane rail supplies module logic, while field switching is decoupled to the 20.4-26.4 VDC output stage.

I/O density scaling is implemented through a 16-point channel structure, where each output is independently addressable within a single module frame. The sinking configuration defines a low-side switching topology, requiring external load connection to positive supply rails.

Backplane current draw is fixed at 250 mA, independent of output loading conditions, separating logic power consumption from field-side current flow.

Frequently Asked Questions (FAQ)

Q: Does the 1746-OVP16 support hot-swapping in an energized SLC 500 chassis?
A: No. Module insertion or removal requires complete chassis power removal to avoid backplane disruption.

Q: What defines the output current limitation per channel?
A: Each channel is rated up to 1.5-1 A depending on thermal and load conditions, with total module current limited to 6.4 A.

Q: Is output switching synchronized per channel or per module?
A: Output switching is synchronized at module level via SLC 500 scan cycle, with channel states updated simultaneously at scan completion.

Field Installation Guidelines

Install the 1746-OVP16 into a compatible SLC 500 rack slot ensuring full engagement with the backplane connector. Power must be removed prior to installation or removal.

Field wiring must follow sinking topology requirements, where each load is connected to a positive DC supply and the module provides the return path. Verify correct polarity before energization.

Maintain separation between low-voltage signal wiring and high-energy switching conductors to reduce electromagnetic coupling. Ensure stable chassis grounding to provide a defined reference potential for output switching operations.