Siemens SIMATIC S7 F Manual page 179

Safety
Time Description
TCiR,F_SEND CiR Synchronization Time of the CPU with the call of
F_SENDBO or F_SENDR:
- From the CiR-Object parameters in STEP7
- Summarize all CiR-Object synchronization times of
the simultaneously changing DP buses and place total
here. If CiR is not used, enter 0.
TCiR,F_RCV CiR Synchronization Time of the CPU with the call of
F_RCVBO or F_RCVR:
-From the CiR-Object parameters in STEP7
-Summarize all CiR-Object synchronization times of the
simultaneously changing DP buses and place total
here. If CiR is not used, enter 0.
Finding TUSEND
You can download a tool for calculating the TUSEND value from the Internet at:
http://www4.ad.siemens.de/view/cs/de/1651770
Contribution ID 1651770
Note
7.4.2.4 Monitoring of Safety-Related Communication Between F-run-time
Groups
Time monitoring takes place in the FBs F_R_BO and F_R_R and is assigned there
at the TIMEOUT input parameter.
To ensure that time monitoring is not triggered when there are no faults, the
TIMEOUT monitoring time must be at least as large as the larger of the two
maximum cyclic interrupt cycle times of F_S_R and F_S_BO or F_R_R and
F_R_BO:
TIMEOUT > MAX(TCimax, F_S; TCImax, F_R)
Note the following:
Time Description
TCImax, F_S Maximum cycle time of the cyclic interrupt OB with the
call of F_R_BO or F_R_R
TCImax, F_R Maximum cycle time of the cyclic interrupt OB with the
call of F_S_BO or F_S_R
Fail-Safe Systems
A5E00085588-03
To activate the monitoring of the maximum communication delay
when the standby in the FH system is updated, you must assign this
parameter a value in HWCONFIG (CPU properties, "H Parameters"
tab).
Simultaneous updating in both CPUs is not assumed.
Where to Find it?
Properties of the CiR_Object
in HWCONFIG.
For additional information,
refer to section 4.8.4
"Configuration in Run (CiR)".
Properties of the CiR_Object
in HWCONFIG.
For additional information,
refer to section 4.8.4
"Configuration in Run (CiR)".
Where to Find it?
Monitoring the F Cycle Time
section
Monitoring the F Cycle Time
section
7-13