SIMATIC MV420 / SIMATIC MV440
Operating Instructions, 04/2013, A5E02371045-06
119
Connecting
7
7.1 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
Class A device to EMC
The reader can cause radio interference in residential areas. In this case, you will have
to take appropriate countermeasures to prevent radio interference.
Use/installation of interference-proof cables
● Only use the recommended cable to connect the reader.
● All cable connectors must be carefully and correctly connected.
● Do not lay signal lines and heavy current lines together. Use a separate cable duct at
least 50 cm from the heavy current lines.
Note
• Refer to the instructions and guidelines in the installation manual SIMATIC Automation
System S7-300 Hardware and Installation, section "Wiring".
• Please note the guidelines for use of PROFINET IO to control and/or transfer results.
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