Configured for field voltage distribution in RSTi/PacSystems distributed I/O assemblies, the GE ST-7518 (ST-7518 Potential Distribution Module) provides direct physical/electrical execution. It routes a 24 VDC external field supply across internal bus connections to provide potential contacts for field devices. The module accommodates continuous current loads up to 10 A, ensuring stable power delivery across connected I/O slice groups.

Hardware Specifications

Backplane Bus Velocity and I/O Density Scaling

The module integrates into the RSTi backplane bus structure to scale field distribution density without requiring external terminal strip wiring. Internal copper bus bars route up to 10 A of field potential across adjacent expansion modules. Low-resistance trace pathways minimize voltage drop across high-density slice clusters, ensuring stable supply levels during simultaneous output switching events.

Frequently Asked Questions

Q: What is the maximum field current rating for the ST-7518 potential distribution module?

A: The module supports a maximum continuous current rating of 10 A at 24 VDC field supply voltage.

Q: How does the ST-7518 deliver power to adjacent I/O modules?

A: The module distributes 24 VDC field potential internally across the RSTi side-by-side bus contacts when snapped into place on the DIN rail.

Field Installation Guidelines

Mount the ST-7518 onto a standard 35 mm DIN rail, pushing it horizontally against adjacent RSTi slices until the side bus connectors engage completely. Connect the primary 24 VDC field supply conductors to the designated input terminals, ensuring wire clamp screws are tightened securely. Maintain clean panel routing by isolating 24 VDC power distribution lines from high-voltage AC motor wires by at least 200 mm to mitigate inductive noise coupling.