Parameter
Description
Safe Start
This parameter determines the behavior of the function block during
the first logic cycle.
•
Active
In the first logic cycle, both inputs must be inactive at the same
time for at least one logic cycle.
If one of the two inputs is already active during the first logic cycle,
the
Enable
output remains 0 until both inputs are 0 at the same
time for at least one logic cycle and both inputs are subsequently
activated.
•
Not active
If one input is already active during the first logic cycle, the
Enable
output switches to 1 as soon as the second input is activated during
the discrepancy time.
If both inputs are already active during the first logic cycle, the
Enable
output switches to 1.
Disable discrepancy
time monitoring
•
Active (discrepancy time monitoring deactivated)
An infinitely long discrepancy time is allowed.
•
Inactive (discrepancy time monitoring activated)
You can configure a maximum allowed
Discrepancy time
.
Discrepancy time
0 … 30 s
The discrepancy time defines how long the two inputs can continue
to have discrepant values after a change in either of the input signals
without this being regarded as an error.
If signals from tested sensors are connected, the discrepancy time
must exceed the test pulse du the maximum OFF-ON delay
of the test output that is being used. You can find these values, for
example, in the report.
When set to 0, both inputs must switch during the same logic cycle.
Table 81: Truth table
Input mode
Input A
Input B
Status
Output
Enable
Equivalent
0
0
Deactivated
0
0
1
Discrepant, input A switched off
0
1
0
Discrepant, input B switched off
0
1
1
Active, if the correct sequence has been
observed and the configured discrepancy
time has not been exceeded
1
Antivalent
0
1
Deactivated
0
0
0
Discrepant, input A switched off
0
1
1
Discrepant, input B switched off
0
1
0
Active, if the correct sequence has been
observed and the configured discrepancy
time has not been exceeded
1
CONFIGURATION
7
8024589/2020-11-10 | SICK
O P E R A T I N G I N S T R U C T I O N S | Flexi Compact
77
Subject to change without notice
