Differences between fault-tolerant systems and standard systems
S7-400H
454 System Manual, 03/2012, A5E00267695-11
Function Additional programming
Information in the system status
list
You can also obtain data records for the fault tolerance-
specific LEDs from the partial list with SSL ID W#16#0019.
You can also obtain data records for the redundancy error OBs
from the partial list with SSL ID W#16#0222.
You can obtain information on the current status of the fault-
tolerant system from the partial list with SSL ID W#16#xy71.
You can also obtain data records for the fault tolerance-
specific LEDs from the partial list with SSL ID W#16#0174.
The partial list with the SSL ID W#16#xy75 provides
information on the status of the communication between the
fault-tolerant system and switched DP slaves.
Update monitoring The operating system monitors the following four configurable
timers:
Maximum cycle time extension
Maximum communication delay
Maximum inhibit time for priority classes > 15
Minimum I/O retention time
No additional programming is required for this. For more detailed
information, refer to chapter Link-up and update (Page 141).
SSL ID W#16#0232 index
W#16#0004 byte 0 of the "index"
word in the data record
Fault-tolerant CPU in stand-alone mode: W#16#F8
Fault-tolerant CPU in single mode: W#16#F8 or W#16#F9
Fault-tolerant CPU in redundant mode: W#16#F8 and W#16#F1
or W#16#F9 and W#16#F0
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