Siemens Simatic S7-1500 Manual page 88

Wiring
4.3 Terminal and block diagrams
The figure below shows the reaction to interruption of the second ground cable.
Figure 4-16 Interruption of the second ground cable using the digital on-board I/O X11 as an example
If a wire break occurs on the second ground cable from the central block terminal to
terminal 30, the module can continue to operate without restrictions, as it is still connected to
the ground via the first cable from the central terminal block to terminal 40.
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CPU 1512C-1 PN (6ES7512-1CK00-0AB0)
Manual, 09/2016, A5E35306440-AB