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SIMATIC MV500
Operating Instructions, 03/2021, C79000-G8976-C494-05
115
Connection
6
6.1
Guidelines for installation free of electrical interference
To prevent interference, you will need to provide shielding for your system. Low-frequency
(LF) and high-frequency (HF) interference signals can result in an incorrect response if the
system is badly grounded or not shielded.
Interfering signals can be caused by:
•
Switching relays or contactors (large, rapid changes in current or voltage and HF
interfering signals).
•
Different ground potentials between two parts of the system (LF interfering signals).
NOTICE
Grounding the device
Make sure that the device is grounded through one of the screw points in the housing.
Use/installation of interference-proof cables
•
Only use the recommended cable to connect the optical reader.
•
Use only shielded cables to power the optical readers.
•
Note that the maximum permitted cable length for the power supply is 30 m.
•
Note that a maximum cable length of 30 m is permitted for the network cable (Ethernet).
•
Do not lay signal lines and heavy current lines together. Use a separate cable duct at least
50 cm from the heavy current lines.
•
The power IO cable must withstand an ambient temperature of at least 80 °C during
operation.
•
Screw in all cable connectors correctly.
Note
Observance of installation guidelines
Observe the information on installation guidelines in the installation manual of the
automation system (
https://support.industry.siemens.com/cs/ww/en/ps/13616/man
) being
used (S7-300/-400/-1200/-1500).
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