Wiring the S7-400
4-32
S7-400 and M7-400 Programmable Controllers, Installation Manual
C79000-G7076-C424-01
4.17 Wiring the Signal Modules
Procedure
There are two steps for providing the connection between the signal modules of
your S7-400 and the sensors and actuators of your plant:
1. Wiring the front connector. This serves to connect the cables to and from the
sensors/actuators to the front connector.
2. Plugging the front connector into the module.
The Three Types of Front Connector
There are three types of front connector for signal modules in the S7-400 series:
Front connector with crimp snap-on terminals
Front connector with screw-type terminals
Front connector with spring-type terminals.
Preparing to Wire the Front Connector
1. Insert a screwdriver at the point marked on the bottom left of the front
connector and lever the lower corner of the cover off the front connector.
2. Open the cover completely.
3. Pull the opened cover forward at the bottom and swing it upwards and off.
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