Inserting Front Connectors Into Modules - Siemens SIMATIC S7-300 Hardware And Installation Manual

7.6

Inserting front connectors into modules

Requirement
The front connectors are completely wired as described in the Chapter Wiring front
connectors .
Inserting the front connector
Inserting with 20-pin front connector
the front
connect
or Step
1. Push in the unlocking mechanism on top
of the module (1).
Hold the unlocking mechanism in this
position and insert the front connector
into the module (1a).
Provided the front connector is seated
correctly in the module, the unlocking
mechanism automatically returns to
initial position when you release it.
Note
When you insert the front connector into the module, an encoding mechanism
engages in the front connector, thus ensuring that the connector can only be
inserted in modules of the same type.
2. Close the front panel (2).
–
S7-300 Programmable Controller Hardware and Installation
A5E00105492-02
1
2
1a
with 40-pin front connector
Screw-tighten the fixing screw in the
center of the connector (1).
This pulls the front connector
completely into contact with the
module.
2
1
Wiring
7-11