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Siemens Simatic S7-300 CPU 31xC Series User Manual

Siemens Simatic S7-300 CPU 31xC Series
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Appendix
A.2 Protection against electromagnetic interference
S7-300, CPU 31xC and CPU 31x: Installation
Operating Instructions, Edition 08/2004, A5E00105492-05
A-5
A.2.2 Five basic rules for securing EMC
A.2.2.1 1. Basic rule for ensuring EMC
If you comply with theses five basic rules ...
you can ensure EMC in many cases!
Rule 1: Large area grounding contact
When you install the automation equipment, make sure that the surfaces of inactive metal
parts are properly bonded to chassis ground.
Bond all passive metal parts to chassis ground, ensuring large area and low-impedance
contact.
When using screw connections on varnished or anodized metal parts, support contact
with special contact washers or remove the protective insulating finish on the points of
contact.
Wherever possible, avoid the use of aluminum parts for ground bonding. Aluminum
oxidizes very easily and is therefore less suitable for ground bonding.
Create a central connection between chassis ground and the equipotential
grounded/protective conductor system.
A.2.2.2 2. Basic rule for ensuring EMC
Rule 2: Proper cable routing
Always ensure proper cable routing when wiring your system.
Sort your wiring system into groups (high-voltage/power supply/signal/data cables).
Always route high-voltage, signal or data cables through separated ducts or in separate
bundles.
Install the signal and data cables as close as possible to grounded surfaces (e.g.
supporting beans, metal rails, steel cabinet walls ).
See also
Cable routing inside buildings (Page A-16)
Outdoor routing of cables (Page A-18)

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Siemens Simatic S7-300 CPU 31xC Series Specifications

General IconGeneral
SeriesS7-300 CPU 31xC
Power Supply24 V DC
Communication InterfacesMPI, PROFIBUS DP
Programming LanguagesLAD, STL, FBD, SCL
Operating Temperature0°C to +60°C
Memory48 KB - 512 KB
Dimensions40 x 125 x 130 mm (varies by model)

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