CPU modules
4.2 CPU module CPU550/CPU551
SIMATIC TDC hardware
92 System Manual, 08/2017, A5E01114865-AL
Operating and fault states
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", chapter Basic soft-
ware, section "Diagnostics".
No
(not with CPU550)
User program is not running
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