Commissioning and configuration
154
BCL 504
i
Leuze electronic
Figure 10.4: Example 3: Start-up delay >0 Switch-off signal prior to lapsing of the start-up
delay
If the output is again deactivated via the switch-off signal before the start-up delay lapses,
only a brief pulse appears at the output following the start-up delay.
Comparison functionality
If, for example, the switching output is to be activated after four invalid read results, the
comparative value
is set to
4
and the
switch-on function
is configured to "
invalid read
result
".
The
comparison mode
parameter can be used to define whether the switching output is
activated only once in the case that the event counter and comparative value fulfil the
"
parity
" condition, or if it is activated multiple times, on each successive event after the
"
parity
" condition is met.
The event counter can always be reset with the I/O data in the
I/O status and control
module; furthermore, the
reset mode
parameter enables automatic resetting upon reaching
the
comparative value
. Automatic resetting upon reaching the
comparative value
always
results in the switching output being switched once independent of the
comparison mode
parameter.
The standard switch-off function at
reading gate start
is rather unsuited for this module
since it causes the event counter to be reset on each reading gate start. Suitable as switch-
off function for this example is the
valid read result
function; otherwise, all switch-off func-
tions are deactivated.
Switch-on signal
Switch-off signal
Output
Start-up delay