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DOK-CONTRL-S20*SYS*INS-AP02-EN-P
IndraControl S20 System and Installation
8.2
Shielding concept
8.2.1
Shielding with IndraControl S20
8.2.2
Shielding when connecting analog sensors and actuators
Shielding is used to reduce the effects of interference on the system.
In the IndraControl S20 system, shielded cables are used with the following mod-
ules:
•
Network cables
•
Connecting cables
–
On modules for analog signals (analog input, analog output,
temperature recording)
–
On special-function and acquisition modules
Observe the following points when shielding:
•
Connect the shield to a module before the signal connection.
•
Ensure a large surface connection of the shield.
•
Make sure there is good contact between the shield and shield bus (syn-
onyms: neutral busbar, busbar).
•
Do not damage or squeeze the wires.
•
When connecting the shielding, observe the specifications for wiring.
•
Make sure the shield is as close as possible to the signal terminal point.
•
Always connect analog sensors and actuators with shielded, twisted pair ca-
bles.
•
Connect the shield via a shield bus. (see
When connecting the cables, observe the information in the module-
specific data sheet.
•
As a rule, shielding must only be connected directly to the PE potential on one
side. This is to prevent any occurrence of equipotential bonding currents via
the shielding (see
Fig. 8-9
•
If necessary, integrate the shielding concept for analog I/O cables in the sys-
tem concept. For example, it is advisable to use a central FE shield connec-
tion at the control cabinet entry (see
For connecting the shield, Bosch Rexroth recommends the
IndraControl S20 shield connection set "S20-SHIELD-SET".
Bosch Rexroth AG
Grounding and shielding
Fig.
8-9)
and
Fig.
8-10).
Fig.
8-10).
73/122
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