Siemens S5-135U/155U appendix Proceed as follows to fit the modules, IMs, Step Action

Central Controllers and Expansion Units Power Supply Units

Proceed as follows to fit the modules:

Step

1

2

3

Action

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.

4

If there is a locking pin on the lower part of the module, turn it to the horizontal position.

5

6

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.

7

8

Swivel the locking bar down and push it back into the subrack.

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 ªRelease circuit.º

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:

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.

System Manual	4-9
C79000-G8576-C199-06