Siemens SIMATIC PCS 7 Operating Manual page 137

To prevent monitoring from being triggered when no errors are present, MAX_CYC must be
set higher than the T
● For non-redundant S7 F/FH systems:
– The setting for T
● For redundant S7 F/FH systems:
– A priority > 15 is used in the S7 F/FH-system for cyclic interrupt OBs with a safety
You can find the value for T
located on the "Cyclic Interrupts" tab in the CPU properties.
Compendium Part B - Process Safety (V8.2)
Operating Manual, 07/2016, A5E35031794-AB
calculated for the corresponding cyclic interrupt OB.
CImax
must be at least as high as the configured execution time (T
CImax
the cyclic interrupt OB.
program. The maximum disabling time for priority classes > 15 (T
taken into account for updating here.
CI
7.11 Monitoring times and system response times
in the "Execution" column of the relevant cyclic interrupt OB,
Configuring the safety program
) must also be
P15
) of
CI
137