Siemens ET 200SP Manual page 18

If a wire break interrupts one of the two ground connections, the outputs are maintained at
the required potential via the remaining ground connection.
NOTICE
Wire break at ground connection
Always route
The following figure shows the wiring of the technology module in two-channel operation.
Figure 3-1
Technology Module TM Pulse 2x24V (6ES7138‑6DB00‑0BB1)
Manual, 05/2019, A5E35061186-AB
two
cables to the central ground connection.
Wiring in two-channel operation
3.1 Terminal assignment and schematic circuit diagram
Connecting
17