Siemens SIMATIC S7-400 Installation Manual page 39

4. Attach the dummy plates to the free slots:
-- Place the dummy plates on the rear wall of the cable routing,
-- Push the dummy plates back so that the noses of the dummy plates will fit
into the cutouts provided,
-- Push the dummy plates in until the snap-in mechanism engages in the
openings on the back of the cable routing.
5. Then install the fan assembly in the 19-inch pitch directly under the rack or
between two racks. Use M6 size screws for mounting.
The following figure shows how to mount the fan subassembly between two
racks.
6. Refit the left cover.
7. Secure the left cover with the quick-release lock.
Monitoring the Fan Subassembly
To monitor the functioning of the fan subassembly via your program, connect the
outputs to a digital module.
Further details on the monitoring concept can be found in the Reference Manual,
Chapter 9.
Automation System S7-400 Hardware and Installation
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Installing the S7-400
Blanking
cover
19-inch
reference level
2-23