Installing and connecting the device
3.3 Connecting the device
SIMATIC IPC327G
26 Operating Instructions, 09/2021, A5E51366275-AA
Fault caused by I/O devices
The connection of I/O devices can cause faults in the device.
The result might be personal injury and damage to the machine or plant.
Note the following when connecting I/O devices:
• Read the documentation of the I/O devices. Follow all instructions in the documentation.
• Only connect I/O devices which are approved for industrial applications in accordance
with EN 61000-6-2 and IEC 61000-6-2.
• I/O devices that are not hotplug-capable may only be connected after the device has
been disconnected from the power supply.
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.
Use copper cables at connectors with terminal connections
Use copper (Cu) cables for all supply lines that are connected to the device with terminals,
e.g. 24 V DC power supply cables to the 24 V DC power supply connectors.
Utiliser des câbles en cuivre sur les connexions à bornes
Utilisez des câbles en cuivre (Cu) pour tous les câbles d'alimentation qui sont raccordés à
l'appareil par des bornes, par exemple les câbles d'alimentation 24 V CC sur le connecteur
d'alimentation 24 V CC.
3.3.2 Connecting the function earth
A connected function earth discharges dangerous electrical charges from the metal
enclosure. The current flowing through the function earth when such a fault occurs triggers
an upstream protective device that disconnects the machine from the power supply.
The function earth also improves the discharge of interference generated by external power
cables, signal cables or cables for I/O modules to ground.
The connection for the function earth is labeled with the following symbol:
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