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5.4
Connecting equipotential bonding
5.4
Introduction
A low-impedance earth connection ensures that interference signals generated by external
power supply cables, signal cables or cables to the I/O modules are safely discharged to
earth.
Procedure
1. Connect the equipotential bonding cable to the equipotential bonding screw on the
underside of the device. The equipotential bonding screw is label with the following
symbol:
2. Connect the equipotential bonding connection of the device to a central earthable point of
the control cabinet. Ensure that the conductor cross-section is not less than 5 mm
5.5
Connecting peripherals
5.5
5.5.1
Overview
When connecting the device for the first time, connect a PS/2 keyboard and PS/2 mouse.
Connect any required USB components such as a USB hub.
Caution
Disconnect the device from mains before connecting peripherals. This does not apply to
connecting and disconnecting USB devices.
Connect only I/O modules approved for industrial applications according to EN 61000-6-
2:2001. Using shielded cables and metal connectors for peripherals. Otherwise, the
specified norms and specifications declared by Siemens AG are no longer valid. Fix the
plugs of the interface cables to the PC housing with screws. This improves the electrical
shielding.
Mouse
Connect a PS/2 or USB mouse.
5.5.2
Connecting a monitor
The front panel is activated as the display by default when the operating system starts. An
external monitor connected to the VGA port is therefore deactivated.
Learn how to activate an external monitor by reading the section "Installing and Removing
Hardware Components" in the "Service and Maintenance" chapter.
Panel PC IL 77
Operating Instructions, Edition 10/2004, A5E00339979-01
5.4 Connecting equipotential bonding
Connection
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5-5
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