Wiring the S7-400
4-37
S7-400 and M7-400 Programmable Controllers, Installation Manual
C79000-G7076-C424-01
Principle of the Spring Contact
The following figure shows the principle of spring contacts. Releasing and
engaging from the front is illustrated.
1. Insert the screwdriver
2. Insert the wire into the spring
contact as far as it will go
3. Withdraw the screwdriver: the wire
is trapped by the contact
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