10. High-speed Input/Output Design Examples 10.3 DHSZ/DHSCR - Multi-segment Coater Control Green Red Yellow Photoelectric switch X1 Control Purpose: z Painting the products with pigments of three colors: red, yellow and green. When the axis of conveyor rotates 1000 times, the pigment will be changed and therefore the painting process will be executed as the following order: red, yellow, green, red yellow, green… Devices: Control Program: M1000 K4000 Y3 Y3 Program Description: z The photoelectric sensor X1 is the external input point of C235. X1 turns on once when the axis of conveyor belt rotates once and therefore C236 counts once.
z When the PV (present value) in C236 and the red pigment will be painted. z When K1000≤ PV in C236≤K2000 (1000≤axis rotations≤2000), Y1 = OFF and Y2 = ON. The yellow pigment will be painted. DVP-PLC Application Examples 10-4 Device Function X1 Photoelectric sensor. X1 turns on once when the axis rotates once. Y1 Painting red pigment Y2 Painting yellow pigment Y3 Painting green pigment C236 Counting the number of axis rotations DCNT C236 DHSZ K1000 K2000 C236 Y1 DHSCR K3000 C236 Y3 RST C236