CPU modules
4.2 CPU module CPU550/CPU551
SIMATIC TDC hardware
94
System Manual, 08/2017, A5E01114865-AL
4.2.5
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 rack. Insert the module and then bolt it onto the rack accordingly (two screw heads,
see "Control and display elements (Page 90)").
●
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.
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 37)".
Note
Shutdown behavior of various CPU modules
The various CPU modules exhibit slight time differences in their shutdown behavior when
the power supply is interrupted.
4.2.6
Connection options
Figure 4-4
Connection options of CPU550/CPU551
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