Installing and connecting the device
3.3 Connecting the device
SIMATIC IPC547E
Operating Instructions, 02/2014, A5E32317120-AB
39
Fault caused by I/O devices
The connection of I/O devices can cause faults in the device. The result may be personal
injury and damage to the machine or plant. Note the following:
• Connect only I/O devices which are approved for industrial applications in accordance
with EN 61000-6-2/IEC 61000-6-2.
• Non-hot-plug capable I/O devices may only be connected when the power supply to the
device is switched off.
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.
Switching off the device (Page 53)
Connection of equipotential bonding
A low-impedance earth connection ensures that interference signals generated by external
power supply cables, signal cables or other cables to the I/O devices are safely discharged
to earth.
The equipotential bonding connection on a device has a large surface and makes contact
over a large area. The equipotential bonding connection is identified by the following symbol:
● T20 screwdriver
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