Siemens SIMATIC IPC427D Operating Instructions Manual page 40

Installing and connecting the device
3.3 Connecting the device
NOTICE
Damage through regenerative feedback
Regenerative feedback of voltage to ground by a connected or installed component can
damage the device.
Connected or built-in I/Os, for example, a USB drive, are not permitted to supply any
voltage to the device. Regenerative feedback is generally not permitted.
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Operating Instructions, 05/2017, A5E31347215-AB
SIMATIC IPC427D