Commissioning and configuration
178
BCL 548
i
Leuze electronic
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 fulfill 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.
10.13.2 Parameters for operating as an input
Debounce time
Parameter for setting the software debounce time for the switching input. The definition of
a debounce time extends the signal transition time accordingly.
If the value of this parameter = 0, no debouncing takes place; otherwise, the configured value
represents the duration in milliseconds for which the input signal must be present and stable.
Start-up delay td_on
If the value of this parameter = 0, no start-up delay occurs for the activation of the input
function; otherwise, the configured value represents the time in milliseconds by which the
input signal is delayed.
Figure 10.7: Start-up delay in input mode
Input signal
Output signal
Start-up delay td_on
Switch-on time ton
Switch-off delay td_off
