Siemens SINUMERIK 828D Commissioning Manual page 240

Service Planner
7.1 Interfaces in the PLC user program
DB9903
DBW14
...
DBW248
DBW250
DBW252
DBW254
Interval: Number of hours after which the maintenance must be performed. When this time expires, the
warning or alarm bit belonging to the task is set for the last time.
Time of the first warning: Number of hours after which the first warning is output. This time must be greater
than or equal to the interval.
Number of warnings to be output: Number of n warnings to be output before the alarm. The alarm bit is
therefore set maximum (n+1)-times, i.e n-times as warning and 1-time as alarm.
Reserved: Reserved for expansions.
Example:
Interval = 100
Time of the 1st warning = 80
Number of warnings to be output = 2
After the task is started, the warning/alarm bit is output for the first time after 80 hours, a second
time after a further 10 hours (i.e. after a total of 90 hours), and the warning/alarm bit is set for
the last time after 100 hours.
DB9904: Actual data
DB9904
Byte
DBW0
DBW2
DBW4
DBW6
DBW8
DBW10
DBW12
DBW14
...
DBW248
DBW250
226
Initial data table [r16]
Reserved 2
...
Interval 32 [h]
Time of first warning 32 [h]
Number of warnings to be output 32
Reserved 32
Actual data table [r16]
Bit 7 Bit 6 Bit 5
Remaining time 1 [h]
Number of warnings output 1
Reserved_1 1
Reserved_2 1
Remaining time 2 [h]
Number of warnings output 2
Reserved_1 2
Reserved_2 2
...
Remaining time 32 [h]
Number of warnings output 32
Bit 4 Bit 3 Bit 2
Commissioning Manual, 10/2015, 6FC5397-3DP40-5BA3
Bit 1 Bit 0
CNC commissioning