Overview

of Junction Box Slots

Junction boxes are used to implement internal connections and to join several harnesses.

A junction box slot is indicated by a junction box icon in the Design Browser (Design tab).

You can use the Edit Properties dialog box for a slot to set it as a junction box slot (see Specifying a Slot Type) or you can add a junction box slot to a diagram (see Creating an Empty Slot).

When signals are routed generally, they always terminate on a slot or in a slot. Signals cannot be routed through an equipment slot or a ground slot.

However, you can route a signal through a junction box slot. You can use the “Route by Attribute/Property” rules on a junction box slot to specify which signals you can and cannot route through it. (See Overview of Rules and Constraints). If you do not specify any rules on a junction box slot, you can route all signals through it.

Note

During synthesis, the signal map on a junction box slot is typically altered to allow signals to route through the slot.

When wiring is synthesized, signals are connected inside a slot in the same way as a splice that is dragged into a slot. This means that the internal connection is modeled as a multiple termination to a slot-device pin inside the slot.

When a signal is routed through a junction box slot, one wire carries it into the slot and another wire carries it out of the slot. Note that signals are able to pass through a junction box slot even if no device is placed in it.

Footprints work on a junction box slot in the same way as they work on other slots.

Parent Topic:

Slot

Capital Systems Integrator User Guide, 2512.2606

Unpublished work. © 2026 Siemens