Siemens Simatic S7-1500 Manual page 90

Wiring
4.3 Terminal and block diagrams
Faulty wiring
The following figure shows faulty wiring, which has a bridge on the front connector.
Figure 4-18 Faulty wiring using the digital on-board I/O X11 as an example: Bridge
Terminals 30 and 40 are connected in the front connector and only routed with one cable to
the central terminal block. If this cable breaks, terminals 30 and 40 are no longer connected
to the ground. The module's supply current flows out via the output terminal.
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CPU 1512C-1 PN (6ES7512-1CK00-0AB0)
Manual, 09/2016, A5E35306440-AB