Release - Siemens S5-135U/155U System Manual

Proceed as follows to fit the modules:
1
2
3
4
5
6
7
8
Some I/O modules can also be fitted or removed during operation. Consult
the reference manuals for the I/O modules, under "Release circuit."
Free slots can be covered with dummy front plates. This improves the flow of
cooling air in the unit. See the ordering information for order numbers.
Connections of
The connecting cables of CPUs, communication processors and EU interface
CPUs, CPs and
modules are connected with metal front connectors.
IMs
There are two types of metal front connector:
Note
Ensure that the connectors are assigned to the correct modules to avoid
damage.
The connection of signal lines for the I/O modules is described in Chapters 8
and 9.
System Manual
C79000-G8576-C199-06
Central Controllers and Expansion Units Power Supply Units
Step
Disconnect the CC from system power.
Slacken the two screws with which the locking bar is fixed to the subrack.
Pull the locking bar forward to its end stop.
– The rail swivels up.
If there is a locking pin on the lower part of the module, turn it to the
horizontal position.
Grasp the module at the front plate, insert it into the lower and upper
guide rails and push it in.
– The connectors at the rear will engage in the sockets on the
backplane bus, and the release lever on the lower part of the
module will be horizontal.
If a locking pin is fitted, push it in and rotate it 90 degrees.
– If you have correctly fitted the module so far, it should no longer
be possible to pull it out of the subrack.
Swivel the locking bar down and push it back into the subrack.
Retighten the two screws on the locking bar.
A metal front connector with slide lock is secured after plugging it in,
by sliding the lock downward.
A metal front connector with milled screws is secured to the unit with
the screws.
Action
4-9