3.6
Interference-Free Connection of Monitors
These sections cover the following topics:
••
Floating connection of cables at video inputs
••
Shielding and grounding concept
Information on selecting the components can be found in Catalog
ST80.
3.6.1
Interference-Free
Connection of a
Monitor to the CP
of the S5 Controller
Operator control and process monitoring systems from the COROS
product family can be used with monitor connections. The physical
arrangement of apparatus and the interference level of the
environment are important for the interference-free connection of
monitors to SIMATIC S5 control systems. The choice of monitor and
video cables is governed by the following:
••
Whether the monitor and PLC are to be operated under
low-interference conditions
or
••
under industrial conditions.
Operation of the monitor and
PLC under low-interference
conditions
Where the monitor and PLC are installed under low-interference
environmental conditions and operated over short distances, the
monitor and PLC are at almost the same ground potentials.
Interference and ground loop disturbances are therefore not expected.
In these cases, you can drive the monitor both via TTL signals and via
analog signals. Digital cables or single-shielded coaxial cables can be
used to transmit the video signals. Note that the braided shield of the
coaxial cable serves as the return conductor and must not be
connected to the shield bar. The monitor and communication
processor (CP) are interconnected without additional shielding and
grounding.
Operation of the monitor and
PLC under industrial
conditions
Where the monitor and PLC are installed under harsh industrial
conditions and operated over great distances, the devices may be at
different ground potentials. These different ground potentials may
cause interference and ground loop disturbances.
Interference-Free Connection of Monitors
System Manual
3 - 32
C79000-B8576-C199-03
