CPU modules
4.1 CPU module CPU555
SIMATIC TDC hardware
System Manual, 08/2017, A5E01114865-AL
81
4.1.4
Application notes and immunity to interference
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Fan operation is necessary.
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Interference-proof operation is only possible if the CPU555 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 76)").
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The module may not be inserted or removed while the rack is on live voltage.
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A CPU must be inserted into the first slot of the rack.
NOTICE
CPU555 in the UR6021 rack
CPU555 may only be used in the rack UR6021.
No CPU555 may be inserted in slot 21 when the UR6021 rack is used.
Note
For more information on fan operation, refer to section "Rack (Page 39)".
For more information on EMC and environmental conditions, refer to section "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.
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