Assembling and Installing Systems
A-17
S7-400 and M7-400 Programmable Controllers Hardware and Installation
A5E00069481-04
A.7
Cabling Inside Buildings
Introduction
Inside buildings, clearances must be observed between groups of different cables
to achieve the necessary electromagnetic compatibility (EMC). Table A-2 provides
you with information on the general rules governing clearances to enable you to
choose the right cables.
How to Read the Table
If you want to know how two lines of different types should be laid, proceed as
follows:
1. Look up the type of the first cable in column 1 (Cables for ...).
2. Look up the type of the second cable in the corresponding field in column 2
(and Cables for ...).
3. Read off the guidelines to be observed from column 3 (Run ...).
Table A-2
Cabling Inside Buildings
Connect Cables for ...
and Cables for ...
Run ...
LAN signals, shielded
(SINEC L1, PROFIBUS DP)
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)
LAN signals, shielded
(SINEC L1, PROFIBUS DP)
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 common bundles or cable
ducts
DC voltage
(
60 V and
400 V), unshielded
AC voltage
(
25 V and
400 V),
unshielded
in separate bundles or cable
ducts (no minimum clearance
necessary)
DC and AC voltages
(
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
(3.93 in.)
