Pilz PSSu H SB CAN - Manual (Page 28)

7.2 Display elements
7 Operation
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Remedy: Correct the hardware registry.
2. Error: A module is missing. Possible cause:
 The module has been removed.
 The module has an error and is no longer registering after a reset.
 The module has an error and switches to a system stop.
 The module no longer has a voltage supply.
Remedy: Rectify the above points.