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3.1.4
Application notes and immunity to interference
● Fan operation is necessary.
● Interference-proof operation is only possible if the CPU550/CPU551 is firmly attached to
● The module may not be inserted or removed while the rack is on live voltage.
● A CPU must be inserted into the first slot of the rack.
3.1.5
Connection options
Figure 3-2
SIMATIC TDC hardware
System Manual, 12/2013, A5E01114865-07
the rack. Insert the module and then bolt it onto the rack accordingly (two screw heads,
see "Control and display elements (Page 59)").
Note
For more information on fan operation, refer to chapter "Rack (Page 39)"!
For more information on EMC and environmental conditions, refer to chapter "General
technical specifications (Page 13)"!
Connection options of CPU550/CPU551
CPU modules
3.1 CPU module CPU550/CPU551
63
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