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