Parker Products COMPAX-M /-S (L) manual External data record selection, Application, Assignments

External data record selection

11.1.2 External data record selection

Application:

One of eight various workpieces should be made available at a data collection station. The number of the desired workpiece is set using a BCD selector switch. The transportation process is then triggered by a starting pulse.

Assignments:

station station station station station					station	station	station	removal
7	6	5	4	3	2	1	0	station

workpiece pick-up

+960 +840 +720 +600 +480 +360 +240 +120 0 -60

The horizontal movement is implemented using an NC axis controlled by COMPAX. A pneumatic cylinder, which is controlled by COMPAX using a double solenoid valve, raises and lowers the workpiece pick-up. COMPAX performs all the functions required without superordinate control.

Wiring up the digital inputs and outputs:

+24V search MZ I1

I2

start	I5
stop	I6

COMPAX	I7	pick-up lifted
		+24V
	I8	pick-up lowered
		+24V

BCD-switch	I9		O7
1	I10
2	I11	evaluation by	O8
BCD 4	I12		removal
		external calling
+24V	I13
		of command lines	station empty
	I14		lower	lift
	I15
			pick-up	pick-up
	I16

Comments:

♦The inputs I9, I14, I15 and I16 have to be placed on GND or left open.

♦The BCD switch has eight settings. The outputs are encoded with binary.

♦The "Data collection station empty" switch is closed when the data collection station is closed. The switch operation prevents the workpiece pick-up being lowered for as long as there is a workpiece in the data collection station.

Function:

The first event after COMPAX has been started is the approaching of the data collection station. If the workpiece pick-up is not lowered, the assumption is made that there is still a workpiece in the workpiece pick-up. This is deposited in the data collection station by lowering the workpiece pick-up. The system is now ready for the first transportation process.

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