Mounting and connecting the device
3.3 Connecting the device
SIMATIC IPC677D
38 Operating Instructions, 09/2014, A5E32995420-AC
Risk of lightning strikes
A lightning flash may enter the mains cables and data transmission cables and jump to a
person.
Death, serious injury and burns can be caused by lightning.
Take the following precautions:
• If there is no additional lightning protection equipment: Disconnect the device from the
power supply in good time when a thunderstorm is approaching.
• Do not touch mains cables and data transmission cables during a thunderstorm.
• Keep a sufficient distance from electric cables, distributors, systems, etc.
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 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.
Connecting the Equipotential Bonding Circuit
A low-resistance ground connection ensures that interference signals generated by external
power supply cables, signal cables or cables to the I/O modules are safely discharged to
ground.
The equipotential bonding connection of the device is located underneath the device and is
identified by the following symbol:
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