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Siemens Automation System S7-400 User Manual

Page 87

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Wiring the S7-400

4-27

Automation System S7-400 Hardware and Installation

A5E00850741-01

Principle of the spring loaded terminal

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

Figure 4-16 Principle of the spring contact