Siemens SIMATIC S5-100U, System Manual

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S5-100U Installation Guidelines
3.4 Wiring Arrangement, Shielding and Measures against
Electromagnetic Interference
This section describes the wiring arrangements for bus cables, signal cables, and power supply
cables that guarantee the electromagnetic compatibility (EMC) of your installation.
3.4.1 Running Cables Inside and Outside a Cabinet
Dividing the lines into the following groups and running the groups separately will help you to
achieve electromagnetic compatibility (EMC).
Group A: Shielded bus and data lines (for programmer, OP, printer, SINEC L1, Profibus,
Industrial Ethernet, etc.)
Shielded analog lines
Unshielded lines for DC voltage 60 V
Unshielded lines for AC voltage 25 V
Coaxial lines for monitors
Group B: Unshielded lines for DC voltage > 60 V and 400 V
Unshielded lines for AC voltage > 25 V and 400 V
Group C: Unshielded lines for AC voltage > 400 V
You can use the following table to see the conditions which apply to the running of the various
combinations of line groups.
Table 3-3. Rules for Common Running of Lines
Group A Group B Group C
Group A
Group B
Group C
Legend for table:
Lines can be run in common bundles or cable ducts
Lines must be run in separate bundles or cable ducts (without minimum distance)
Inside cabinets, lines must be run in separate bundles or cable ducts and outside cabinets but
inside buildings, lines must be run on separate cable trays with a gap of a least of 10 cm
between lines.
EWA 4NEB 812 6120-02b
3-29