Wiring Rules For Connecting The Supply Voltage - Siemens SIMATIC S7-300 Reference Manual

Wiring rules for connecting the supply voltage

The following table shows you what you have to consider when connecting the
module supply voltage to the terminal block or front connector module.
The terminals for the supply voltage are screws or spring-loaded terminals (refer to
Section 8.2.4 for handling spring-loaded terminals).
Table 8-3 Wiring Rules for Connecting the Supply Voltage
Rules for ...
Conductor
cross-sections suitable
for connection:
Solid conductors
Stranded conductors
•
Without end ferrules
•
With end ferrules
No of conductors per
terminal
Max. diameter of
conductor insulation
Length of conductor
insulation to be stripped
•
Without insulation
collar
•
With insulation collar
End ferrules to
DIN 46228
•
Without insulation
collar
•
With insulation collar
2
– 0.25 to 1.0 mm
2
– 1.5 mm
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
SIMATIC TOP Connect and SIMATIC TOP Connect TPA
Terminal block
Spring-loaded
connection
No
0.25 to 1.5 mm
0.25 to 1.5 mm
1 or combination of 2 conductors up to 1.5 mm
∅ 3.1 mm
11 mm
11 mm
Model A; up to 12 mm
long
Model E; up to 12 mm
long
Model E; 12 mm long
Screw-type
connection
2
2
2
end ferrule
Model A; up to 12 mm
long
Model E; up to 12 mm
long
Model E; 18 mm long
Front connector
Up to 4 Up to
Terminals Terminals
No No
0.25 to 0.25 to
2 2
1.5 mm 0.75 mm
0.25 to 0.25 to
2 2
1.5 mm 0.75 mm
(sum) in a common
∅ 3.1 mm ∅ 2.0 mm
6 mm
–
Model A; 5 to 7 mm long
–
8-7
8