Monitoring Times; Configuring The Monitoring Times For F/Fh Systems - Siemens SIMATIC S7 F Manual

Safety
7.4

Monitoring Times

7.4.1

Configuring the Monitoring Times for F/FH Systems

Rules for Monitoring Times
When you configure the monitoring times, you must take into consideration both
the availability and the safety of the F/FH system:
•
Availability: To ensure that the temporal monitoring is not triggered when there
is no error, the monitoring times selected must be sufficiently long.
•
Safety: To ensure that the process safety time is not exceeded, the monitoring
times selected must be sufficiently short.
Monitoring Times of an F System
You must configure the following monitoring times for the F-system:
•
Parameters of the fail-safe blocks:
Monitoring
Monitoring of the F cycle time of the cyclic interrupt OB
that contains the safety program
Monitoring of safety-related communication between F
run-time groups
Monitoring Safety-Related Communication Between
CPUs
•
Parameters of the F-I/Os
Monitoring
Monitoring Safety-Related Communication
Between F-CPU and F-I/Os via PROFIsafe
7-8
Block
F_CYC_CO
F_R_R
F_R_BO
F_RCVR,
F_RCVBO
F_SENDR,
F_SENDBO
Parameter
Monitoring time (properties dialog in
HWCONFIG)
Fail-Safe Systems
Parameter
MAX_CYC
TIMEOUT
TIMEOUT
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