After each start, the current Boot Cycle Counter is read from the non-volatile memory, incremented by 1 and rewritten. In addition, a second Boot Cycle Counter is implemented that can be reset.
The output of the current boot cycle can serve as a control for the service interval as well as for preventative maintenance. Schedules for regular maintenance can be tied to the values of the Boot Cycle Counter.
Process Data
Boot cycle counters – Process data
Object ID
Name
Description
Direction
0x001E (30)
Boot Cycle Counter
Output of the current Boot Cycle Counter
Input
0x001F (31)
Custom Boot Cycle Counter
Output of the resettable Boot Cycle Counter
Input
Also see Process Data Profiles.
ISDU
Boot cycle counter – ISDU
Name
Index
Subindex
Access
Length
Data Type
Data Storage
Default
Boot Cycle Counter
0x0058 (88)
0
R
8 bytes
n/a
Boot Cycle Counter
1
R
4 bytes
UINT32
n/a
–
Custom Boot Cycle Counter
2
R
4 bytes
UINT32
n/a
–
Note
The maximum counter value that can be saved is 1,000,000 and, with a switch-on and switch-off every 12 minutes, this means a service life of over 20 years.
Boot Cycle Counter Parameter
This parameter saves the value of the current boot cycle, which is incremented on each start.
Custom Boot Cycle Counter Parameter
This parameter saves the value of the current, user-defined counter, which is incremented on each start and can be reset via the Maintenance Reset system command.
System Commands
Boot cycle counter – System Commands
Command Value
Device Action
0x81 (129)
Application Reset – Resets the Custom Boot Cycle Counter with ISDU-index 0x58 subindex 2 to the default value 0.
0x82 (130)
Restore Factory Settings – Resets the Custom Boot Cycle Counter with ISDU-index 0x58 subindex 2 to the default value 0.
0xA5 (165)
Maintenance Reset – Resets the Custom Boot Cycle Counter with ISDU-index 0x58 subindex 2 to the default value 0.