Internal Signal

A signal associated with a placed functional device in a slot is mapped to the slot cavities by the device pins that carry the signal by default. Sometimes a signal may appear only within a single slot for a particular configuration and there is no need for its wiring to be routed outside of the slot.

You can unmap a signal from slot cavities so that associated wiring is not routed when wiring is synthesized. The signal is then given the status internal. An internal signal is not considered an error, although this scenario involves unmapped device pins. Internal signals are listed in the Design Browser (Design tab).

A signal has an internal status if all of the active hit points for it are within one slot and none of them are mapped to a cavity. An active hit point is a placed device pin that is active in the currently active vehicle configuration.

The system changes the internal status of a signal to a non-internal status as necessary when various actions are performed on the diagram.

You can edit internal signals in the Signal Map for a slot. See Connector Refinement and Signal Mapping for more information.

Examples of Internal Signals

Example A:

A Capital Logic Designer design has four devices and four nets connected as follows:

Figure 97: Design with Four Devices and Four Nets

In Capital Systems Integrator, the device are placed in slots as follows:

Figure 98: Devices Placed in Slots

Signals COND11 and COND12 are completely within one slot and can be internal.

Example B:

A Capital Logic Designer design has four devices and three nets connected as follows:

Figure 99: Design with Four Devices and Three Nets

In Capital Systems Integrator, DEV1 and DEV2 are placed together twice in separate slots using variant-based placement:

Figure 100: Devices Placed in Slots Using Variant-Based Placement

Signal COND12 can be internal for the current configuration as long as the device pins of COND12 are active only in one of the slots but not both.

Alternatively, the devices may be placed as below using variant-based placement:

Figure 101: Alternative Variant-Based Placement

In this case, COND12 can still be internal if the hit points are active on the left slot but not on the right and bottom slots.

Parent Topic:

Editing Slots

Capital Systems Integrator User Guide, 2512.2606

Unpublished work. © 2026 Siemens