Siemens CPU 312, Руководство по аппаратному обеспечению и установке

Страница: 201 / 238

$SSHQGL[
S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
A5E00105492-03
12-15
&DEOH5RXWLQJLQVLGH%XLOGLQJV
,QWURGXFWLRQ
Inside buildings (inside and outside cabinets), clearances must be maintained
between groups of different cables to achieve the necessary electromagnetic
compatibility (EMC). The table contains information on the general rules governing
clearances to enable you to choose the right cables.
+RZWRUHDGWKHWDEOH
To find out how to run two cables of different types, 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. Note the applicable directives in column 3 (Run ...).
Table 12-7 Routing cables inside buildings
&DEOHVIRU DQGFDEOHVIRU 5XQ
•
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 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)
•
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)
• DC and AC voltage (> 400 V),
unshielded
LQVLGHFDELQHWV
In separate bundles or cable
ducts (no minimum clearance
necessary)
RXWVLGHFDELQHWV
On separate cable racks with a
clearance of at least 10 cm