Siemens Simatic S7-300 CPU 31xC Series - Page 227

Appendix
A.2 Protection against electromagnetic interference
S7-300, CPU 31xC and CPU 31x: Installation
Operating Instructions, Edition 08/2004, A5E00105492-05
A-17
Cables for ... and cables for ... Run ...
• Bus signals, shielded (PROFIBUS)
• Data signals, shielded
(programming devices, operator
panels, printers, counter inputs,
etc.)
• Analog signals, shielded
• DC voltage ( ≤ 60 V), unshielded
• Process signals ( ≤ 25 V), shielded
• AC voltage (≤ 25 V), unshielded
• Monitors (coaxial cable)
In separate bundles or cable ducts (no
minimum clearance necessary)
• DC voltage (> 60 V and ≤ 400 V),
unshielded
• AC voltage (> 25 V and ≤ 400 V),
unshielded
In common bundles or cable ducts
• DC voltage (> 60 V and ≤ 400 V),
unshielded
• AC voltage (> 25 V and ≤ 400 V),
unshielded
• DC and AC voltage (> 400 V),
unshielded
Inside cabinets:
In separate bundles or cable ducts (no
minimum clearance necessary)
Outside cabinets:
On separate cable racks with a
clearance of at least 10 cm
• Bus signals, shielded (PROFIBUS)
• Data signals, shielded
(programming devices, operator
panels, printers, counter inputs,
etc.)
• Analog signals, shielded
• DC voltage ( ≤ 60 V), unshielded
• Process signals ( ≤ 25 V), shielded
• AC voltage (≤ 25 V), unshielded
• Monitors (coaxial cable)
Inside cabinets:
In separate bundles or cable ducts (no
minimum clearance necessary)
Outside cabinets:
On separate cable racks with a
clearance of at least 10 cm
DC and AC voltage (> 400 V),
unshielded
• DC and AC voltage (> 400 V),
unshielded
In common bundles or cable ducts
ETHERNET In common bundles or cable ducts ETHERNET
Others In separate bundles or cable ducts with
a clearance of at least 50 cm