Startup Behavior
Note
If the sensors at the inputs IN1 and IN2 are assigned to different F-I/Os, it is
possible that the substitute values are output for different lengths of time following
startup of the F system due to different startup response of the F-I/Os. If the signal
states of the two inputs IN1 and IN2 remain different after the discrepancy time
DISCTIME has elapsed, a discrepancy error is detected after the F system starts
up.
If ACK_NEC = 1 you must acknowledge the discrepancy error with a rising edge
at input ACK.
!
Safety Note
With times and periods of time you must take into account the inaccuracy that
results from the cyclic processing. This is the same as the cycle time of your F
run-time group.
You must also take into account the tolerance of the internal monitoring of the
times in the F-CPU:
• for time values up to 100 ms maximum 20% of the set time value
• for time values higher than 100 ms maximum 2% of the set time value
Product Information for the S7 Distributed Safety, Configuring and Programming Manual
A5E00169432-02
51
To Next Page
Loading...
