Wiring Rules - Siemens SIMATIC TOP connect Manual

Connecting

4.2 Wiring rules

Protection from external electrical interference
To prevent electrical interference and faults, note the following:
● Each plant or system fitted with an S7-300 must be connected to a protective conductor
with a sufficient cross-section to handle electromagnetic interference.
● For supply, signal and bus cables, you must make sure that the cables are correctly routed
and installed.
● For signal and bus cables, you must make sure that an open circuit or crossover will not
result in undefined plant or system states.
Reference
You can find more information in the "Designing Interference-free Controllers" function manual.
4.2 Wiring rules
The tables below list the wiring rules for connecting supply voltage of I/O modules to the
terminal modules or front connector module.
Terminal modules
Table 4-1 Wirings rules for terminal modules
Wiring rules
for ...
Connectable cable cross-sections
... solid cables
... flexible cables
... without end sleeve
... with end sleeve
according to DIN 46228/1
... with end sleeve
in accordance with DIN 46228/4 with
plastic collar
Number of cables per connection
Max. diameter of insulation
Stripped length of the cables
... without insulating collar
... with insulating collar
Blade of the screwdriver
Tightening torque for connecting the ca‐
bles
22
Terminal module
Push-in system
No
0.2 to 2.5 mm²
0.2 to 2.5 mm²
0.2 to 2.5 mm²
Combination of 1 or 2 conductors to make up the cross-sections specified above
(in total) in one end sleeve.
0.6 x 3.5
Screw-type terminal
0.5 to 2.5 mm²
(2.5 mm² with crimp acc. to EN 60947-1)
0.6 x 3.5
0.4 Nm
System cabling for S7-300
Manual, 09/2018, 70327045899