CPU modules
4.1 CPU module CPU555
SIMATIC TDC hardware
System Manual, 08/2017, A5E01114865-AL
79
Operating and fault states
User program is not running
Diagnostics should start at the CPU module that was the first to dis-
play fault message “0”.
• Flashing "0" Faults on this module
• Permanent "0": Faults on a different module
If none of the CPU modules can be identified as having been the first
one, then the one inserted to the extreme left should first be selected
of those which display a "0".
No
User program is running
Low-priority errors during initialization that allow the start of normal
operation and that are detected in the background process, e.g.: e.g.
• missing or low backup battery
• Missing program memory module
• Fan failure
• Invalid real value
• PN bus/group error (flashing; faulty module)
Note: The PN bus/group error can also be acknowledged while it
is still pending. After acknowledgment, this error is not displayed
again until it occurs again (new incoming event/error).
Yes
User program is running
Incorrect configuration of communication, or connection error
For more information on diagnostics functions, refer to the manual
"D7-SYS - STEP 7, CFC and SFC configuring
(http://support.automation.siemens.com/WW/view/de/8776786/0/en)",
chapter Basic software, section "Diagnostics".
(Initial error = flashing; additional errors = continuous display)
No
User program is not running
Selection in the "Target system/Operating state" menu
User stop results in a stop of all CPUs in the same rack.
• Permanent "d":
Module is in STOP, triggered by another CPU.
• Flashing "d"
Module is in STOP, triggered by this CPU itself.
No
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