Minimum Monitoring Time For Safety-Related Communication Between F-Runtime Groups - Siemens SIMATIC S7 System Manual

Monitoring and Response Times of F-Systems
A.4 F-Related Monitoring Times for S7 F/FH Systems
Determining TUSEND
A tool for calculating the TUSEND value is available online at the Internet address below
(article ID 1651770):
http://www4.ad.siemens.de/view/cs/en/1651770
Note
To enable monitoring of the maximum communication delay when the reserve is updated in
S7 FH Systems, you must assign a value to this parameter in
for the CPU, "H-Parameters" tab.
Simultaneous updating in both F-CPUs is not assumed.
A.4.4 Minimum Monitoring Time for Safety-Related Communication between F-Runtime
Groups
TIMEOUT Parameter in F_R_BO or F_R_R
Time monitoring takes place in F-blocks F_R_BO or F_R_R and is assigned in the TIMEOUT
input parameter.
To ensure that time monitoring does not respond when no faults are present, the selected
TIMEOUT monitoring time must be at least as large as the greater of the two maximum time
interrupt cycle times for F_S_R or F_S_BO and F_R_R or F_R_BO:
TIMEOUT > MAX (TClmax, F_S; TCImax, F_R)
TIMEOUT > than the greater of the two values
1
Definition of Times
Time
TCImax, F_S
TCImax, F_R
See also
Minimum Monitoring Time for F-Cycle Time (Page A-9)
A-14
Definition
Maximum cycle time of the time interrupt OB
with the call of F_S_BO or F_S_R
Maximum cycle time of the time interrupt OB
with the call of F_R_BO or F_R_R
HW Config
1
Reference
see
Times for F-Cycle Time"
see
Times for F-Cycle Time"
Safety Engineering in SIMATIC S7
System Manual, 04/2006, A5E00109529-05
, Object properties
"Minimum Monitoring
"Minimum Monitoring