Siemens SIMATIC S5-100U, System Manual

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S5-100U Installation Guidelines
Note the following when connecting the cable shield:
• Use metal cable clamps for fixing the braided shield. The clamps have to enclose the shield over
a large area and make good contact (see Figure 3-26).
• Connect the shield to a shield bar immediately at the point where the cable enters the cabinet.
Route the shield to the module; do not connect it to the module.
Figure 3-26. Fixing Shielded Cables with Various Types of Cable Clamps
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3.4.5 Special Measures for Interference-Free Operation
Arc Suppression Elements For Inductive Circuits
Normally, inductive circuits (e.g. contactor or relay coils) energized by SIMATIC S5 do not require to
be provided with external arc suppressing elements since the necessary suppressing elements are
already integrated on the modules.
It only becomes necessary to provide arc supressing elements for inductive circuits in the following
cases:
•
If SIMATIC S5 output circuits can be switched off by additionaly inserted contactors (e.g. relay
contactors for EMERGENCY OFF). In such a case, the integral suppressing elements on the
modules become ineffective.
• If the inductive circuits are not energized by SIMATIC S5.
You can use free-wheeling diodes, varistors or RC elements for wiring inductive circuits.
Figure 3-27. Wiring Coils
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with Zener diode
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with varistor
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with RC element
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Wiring coils activated by direct current
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Wiring coils activated by alternating current
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EWA 4NEB 812 6120-02b
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