3. The I/O module
3-24
Festo P.BE-CB-COMP-EN en 1102d
If the set target number of parts types is reached, all further
good parts of the parts type up to the moment when the
small parts conveyor is switched off will be returned to the
conveyor at the actuator position for superfluous good parts.
Bad parts will be output further at the relevant position.
CFul
When the last good part of a counting procedure reaches the
output position for good par ts, the output O/22 on the con-
nection PLC will be set from LOW > to HIGH (“Target num-
ber reached”). The current counter status is ended. The
CHB-C-X shows “cFul”.
All subsequent good parts will be returned to the small parts
conveyor. When the time preset with CheckKon has expired,
the small parts conveyor will be switched off.
In order to star t a new counting procedure, the CHB-C-X
requires the signal “Start new cycle” from the higher-order
controller. In order that the counting cycle can be started, the
pulse LOW > HIGH > LOW must be applied at input I/18.
During the pulse duration t
sc
good parts will still be returned.
The new counting cycle starts with the falling edge at I/18
(see follo wing table).
Pin
Signal level Significance
I/18
LOW > HIGH > LOW
Starts new counting cycle
O/22 HIGH Preselected c ounter status
reached
LOW Preselected counter status not
yet reached
Tab. 3/14: Signal sequence for controlling the counting pro-
cedure
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