Wiring Front Connectors - Siemens SIMATIC S7-300 Hardware And Installation Manual

Wiring
Wiring the front connector
Table 6-6

Wiring front connectors

Step 20-pin front connector
1. Thread the cable strain relief into the front
connector.
2. Do you want to exit the cables at the bottom of the module?
If yes:
Starting at terminal 20, work your way down
to terminal 1.
If not:
Starting at terminal 1, work your way up to
terminal 20.
3. Front connectors with screw terminals:
Screw-tighten unused terminals also.
4. –
5. Pull the cable strain-relief assembly tight. Push in the strain relief retainer to the left to improve
utilization of the available cable space.
–
1
6-10
–
Starting at terminal 40 or 20, wire the connector,
working in alternating passes from terminals 39,
19, 38, 18 etc.until you have reached
terminals 21 and 1.
Starting at terminal 1 or 21, wire the connector,
working in alternating passes from terminals 2,
22, 3, 23 etc.until you have reached
terminals 20 and 40.
Attach the cable strain-relief assembly around
the cable and the front connector.
2
0.4 Nm to
0.5 Nm to
0.7 Nm
0.8 Nm
S7-300 Programmable Controller Hardware and Installation
40-pin front connector
2
1
4
3
A5E00105492-01