15. Handy Instruction Design Examples 15.5 IST - Electroplating Process Auto Control Left-limit X0 Right-limit X4 Limit of plating tank X1 Limit of recovery tank X2 Limit of rinse tank X3 Move Left Move Right X5. Upper-limit of hook Y0 Hook up Y3 Y2 Lower-limit of hook X6 Plating tank Recovery tank Rinse tank Clipping location Conveyor belt Power ON X15. Zero return ON X16. Auto start Power OFF X17. Auto stop Hook up Move left Clip Single Step X12 X20 X22 X24 Zero return X11 X13 One cycle Hook down Move right Release Manual X10 X14 Continuous X21 X23 X25 Control Purpose: z Applying PLC on auto control process of PCB electroplating.
There is a traveling crane equipped with a lifting hook in the production line. The hook has a clip for clipping and releasing the workpiece. The traveling crane and the lifting hook are controlled by 2 motors and a control panel. In addition, there are plating tank, recovery tank and rinse tank in the process of plating workpiece, recycling plating solution and cleaning workpiece. z Process:
Clip the workpiece → Put it in the plating tank for 280 minutes → lift it to the upper-limit and stay for 28s → soak it in the recovery tank for 30 minutes → lift it to the upper-limit and stay for 15s → clean it in the rinse tank for 30s → lift it to the upper-limit and stay for 15s → put it z 3 operation modes: on the conveyor belt. Manual: select manual mode (X10 = ON) and enable/disable output devices by controlling corresponding switches (X20~X25). Zero return: select zero return mode (X11 = ON) and press the zero return button X15 to execute this function. DVP-PLC Application Examples 15-12