Siemens SIMATIC S7-400H System Manual page 112

Link-up and update
9.4 Time monitoring
5. For each DP master system this results in
6. Select the minimum of all T
7. Define the share of the maximum disable time for I/O classes > 15 determined by the
8. Using the information in section Link-up sequence (Page 99), calculate the share of the
9. The recommended value for the maximum disable time for priority classes > 15 is now
112
T (DP master system) = T
P15
NOTICE
If T (DP master system) < 0, stop the calculation here. Possible remedies are shown
P15
below the following example calculation. Make suitable changes and then restart the
calculation at 1.
This time is then known as TP15_HW.
minimum I/O hold time (T
T = 50 ms + min. I/O hold time [2]
P15_OD
NOTICE
If T > T , stop the calculation here. Possible remedies are shown below the
P15_OD P15_HW
following example calculation. Make suitable changes and then restart the calculation
at 1.
maximum disable time for priority classes > 15 defined by the user program (T
NOTICE
If T > T , stop the calculation here. Possible remedies are shown below the
P15_AWP P15_HW
following example calculation. Make suitable changes and then restart the calculation
at 1.
obtained from:
T = MAX (T , T
P15 P15_AWP
- (2 x T + T
PTO TR WA
(DP master system) values.
P15
):
P15_OD
) [3]
P15_OD
+ T + T + T
PROG DP_UM SLAVE_UM
System Manual, 09/2007, A5E00267695-03
) [1]
).
P15_AWP
S7-400H