3. Timer Design Examples 3.15 Auto Interruption Timer Control Purpose: z In PLC production lines, an operator should be in charge of packing products on two conveyor belts into 2 boxes. For ensuring that operators have sufficient time for packing, the program is designed to control two conveyor belts to be running alternatively: stops one conveyor after 30 sec running and then starts another conveyor for 30 sec running. Devices: Control Program: T0 T0 M0 M1 M0 Trigger Circuit M1 M0 M1 M1 Y0 M1 Y1 DVP-PLC Application Examples 3-25 Production Line 1 Y0 Production Line 2 Y1 Device Function T0 30 sec timer. Time base:
100ms M0 Controlling the trigger circuit M1 Alternating the conveyor belt Y0 Executing the production line 1 Y1 Executing the production line 2 TMR T0 K300