Plugging The Front Connectors Into Modules - Siemens Simatic S7-300 CPU 31xC Series Installation And Operating Instructions Manual

Wiring

6.6 Plugging the front connectors into modules

6.6 Plugging the front connectors into modules
Requirements
The front connectors are completely wired.
Front connectors plugging
Table 6-7
Step
1.
2.
6-10
Inserting the front connector
20­pin front connector
Push in the unlocking mechanism on top of
the module.
Keeping the locking mechanism pressed,
insert the front connector into the module.
Provided the front connector is seated
correctly in the module, the unlocking
mechanism automatically returns to the
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 into modules of
the same type.
Close the front panel.
1 1
P S
C P U
2
The work step numbers are shown in the figure above
(1) Keep unlocking mechanism pressed.
(2) Insert front connector.
(3) You can now close the front panel
40­pin front connector
Tighten the mounting screw in the center
of the connector.
This pulls the front connector completely
into contact with the module.
Close the front panel.
P S
3
(1) Tighten mounting screw.
(2) You can now close the front panel
S7-300, CPU 31xC and CPU 31x: Installation
Operating Instructions, Edition 08/2004, A5E00105492-05
1 2
C P U
1 1