Siemens S5-155U System Manual page 81

Connection of CPUs,
CPs and IMs
System Manual
C79000-B8576-C199-03
Proceed as follows to fit the modules:
Step Action
1 Disconnect the CC from system power.
2 Slacken the two screws with which the locking bar is fixed
to the subrack.
3 Pull the locking bar forward to its end stop.
– The rail swivels up.
4 If there is a locking pin on the lower part of the module,
turn it to the horizontal position.
5 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.
6 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.
7 Swivel the locking bar down and push it back into the
subrack.
8 Retighten the two screws on the locking bar.
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.
The connecting cables of CPUs, communication processors and EU
interface modules are connected with metal front connectors.
There are two types of metal front connector:
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.
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.
S5-135U/155U Central Controller
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