8-13 Implement the automatic stacking process shown. In this process, conveyor M1 is used to stack metal plates onto conveyor M2. The photoelectric sensor provides an input pulse to the PLC counter each time a metal plate drops from conveyor M1 to M2. When 15 plates have been stacked, conveyor M2 is activated for 5 seconds by the PLC timer. The operation can be summarized as follows: When the start button is pressed, conveyor M1 begins running. After 15 plates have been stacked, conveyor M1 stops and conveyor M2 begins running. After conveyor M2 has been operated for 5 seconds, it stops and the sequence is repeated automatically. The done bit of the timer resets the timer and counter, and provides a momentary pulse to automatically restart conveyor M1. Use the bottles, instead plates, in conjunction with the Bottle Line Simulator screen and the following addresses to simulate the program: Stop PB _ I:1/0 Start PB _ I:1/1 Conveyor M1 _ O:2/0 Conveyor M2 _ O:2/2 TON _ T4:1 CTU _ C5:1 page 84