Festo Checkbox Compact CHB-C-X, Руководство пользователя

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4. I/O module extensions of the CHB−C−P/..X
4−19
Festo P.BE−CB−COMP−en en 0503c
4.3.6 Buffer zone sensors/small parts conveyor
Please note
This chapter contains supplementary information on con
trolling the small parts conveyor and the buffer zone sen
sors via the PLC interface. Note also the instructions and
information in chapter 3.3.
Internal circuitry The I/O signals for buffer zone sensors and the small parts
conveyor at the PLC connection are connected internally with
the BUFFER/FEEDER connection.
BUFFER
FEEDER
PLC
Function
O/1 O/21
24 V reference voltage for
buffer zone sensors
Readiness to operate
Controlling the conveyor device
O/2 O/8 24 V power output for controlling
a small parts conveyor (feeder)
O/3 O/4
0 V reference voltage
Buffer zone sensors
I/4
I/12
Buffer zone sensor 1
Tab.4/16: Internal circuitry BUFFER/FEEDER−PLC
Switch−on delay of the small parts conveyor
After starting, the Checkbox triggers the actuator for sorting
out the bad parts. This is to ensure that no (unchecked) parts
are left on the conveyor device. This results in a delay of a
few seconds between the external Start command (I/6) and
the switch−on signal for the small parts conveyor (O/8). The
duration of this delay depends on ambient parameters, e.g.
transporting speed and geometrical variables.