Monitoring and Response Times of F-Systems
A.4 F-Related Monitoring Times for S7 F/FH Systems
Safety Engineering in SIMATIC S7
A-10
System Manual, 04/2006, A5E00109529-05
Definition of Times
Time
Definition
Reference
TCI
Configured cycle time for the time interrupt
OB
In
HW Config
: Object properties for CPU,
"Time interrupt, Type"
TP15
Maximum lockout time for priority classes >
15
In
HW Config
: Object properties for CPU,
"H-parameters"
TCiR
CiR synchronization time of F-CPU:
Sum of CiR synchronization times for all DP
master systems that are to be changed
simultaneously.
In
HW Config
: Object properties for CiR
object
If CiR is not used, enter "0" in the
formulas.
Time Interrupt OB with Special Handling
A "time interrupt OB" with special handling is an H-parameter of the F-CPU in
S7 FH Systems. This parameter includes the number of the time interrupt OB that is called
specially when the operating system updates the reserve once all interrupts are disabled. In
general, the number entered is the highest priority time interrupt OB to which F-blocks of the
safety program are assigned in CFC.
Note
To ensure that monitoring of the maximum disabling time for priority classes > 15 is enabled,
you must assign a value to this parameter in the "H-Parameters" tab of the object properties
for the CPU in
HW Config.
Further Information on CiR
•
STEP 7 online help: "System Changes during Operation Using CiR"
•
SIMATIC System Software for S7-300/400 System and Standard Functions manual
•
Programmable Controllers S7 F/FH manual
