Siemens CPU 410-5H Process Automation - Page 118

Link-up and update
8.3 Time monitoring
CPU 410-5H Process Automation/CPU 410 SMART
118 System Manual, 10/2013, A5E32631667-AA
1. Based on the bus parameters in STEP 7:
T
TR_1
= 25 ms
T
TR_2
= 30 ms
T
DP_UM_1
= 100 ms
T
DP_UM_2
= 80 ms
2. Based on the configuration in STEP 7:
T
max_Akt
= 8 ms
T
PN_UM
= 110 ms
3. Based on the technical data of the DP slaves used:
T
SLAVE_UM_1
= 30 ms
T
SLAVE_UM_2
= 50 ms
4. Based on the technical specifications of the PN devices used:
T
Device_UM
= 20 ms
5. Based on the technological settings of your system:
T
PTO_1
= 1250 ms
T
PTO_2
= 1200 ms
T
PTO_PN
= 1000 ms
6. Based on the user program:
T
WA
= 300 ms
T
PROG
= 50 ms
7. Based on the formula [1]:
T
P15
(DP master system_1)
= 1250 ms - (2 x 25 ms + 300 ms + 50 ms + 100 ms + 30 ms) = 720 ms
T
P15
(DP master system_2)
= 1200 ms - (2 x 30 ms + 300 ms + 50 ms + 80 ms + 50 ms) = 660 ms
8. Based on the formula [1]:
T
P15
(IO subsystem)
= 1200 ms - (2 x 8 ms + 300 ms + 50 ms + 110 ms + 20 ms) = 704 ms
Check: Since T
P15
> 0, continue with
1. T
P15_HW
= MIN (720 ms, 660 ms, 704 ms) = 660 ms
2. Based on the formula [2]:
T
P15_OD
= 50 ms + T
PH
= 50 ms + 90 ms = 140 ms
Check: Since T
P15_OD
= 140 ms < T
P15_HW
= 660 ms, continue with