CPU modules
4.2 CPU module CPU550/CPU551
SIMATIC TDC hardware
94 System Manual, 08/2017, A5E01114865-AL
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
(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.
Figure 4-4 Connection options of CPU550/CPU551
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