Principle Of The Spring Contact - Siemens SIMATIC S7-400 Installation Manual

Principle of the spring loaded terminal
The following figure shows the principle of spring contacts. Releasing and
engaging from the front is illustrated.
Figure 4-16 Principle of the spring contact
Automation System S7-400 Hardware and Installation
A5E00850741-01
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
Wiring the S7-400
4-27