2. PB1 (NO) and PB2 (NC) are push buttons. If PBl is activated momentarily, RL (red LED) goes ON for 20 seconds, and then goes OFF and then GL (green LED) goes ON for 10 seconds and then goes OFF. unless. second period; in this case, RL will stay ON and PB2 is activated during the initial 20 GL will not go ON RL on han to ggle Initially, the toggle switch is in the left position (TOG1 is ON): if the toggle switch is moved to the right position (TOG1 is OFF. TOG2 is ON). the process is returned to the ground position. Develop a ladder logic program to implement this 3. Modify Problem No. 2 by modifying the condition that PB2 is activated during the initial 20 second period by substituting the following condition: PB2 is activated and then deactivated 3 times or more during this initial 20 second period. Develop a ladder logic program to implement this 4. Consider a conveyor belt driven by motor M1. A process is started when PBl is activated momentarily to start MI. The conveyor carries an object along: When the object breaks (interrupts) a cross-beam (light beam and photo sensor, PS1). PS1 goes from ON to OFF, and the conveyor stops for 10 seconds and then continues. When the object reaches the end of the conveyor. it triggers a limit switch. LSI(NO). The object is then removed from the conveyor. After 24 objects have triggered LS1, the conveyor stops. Develop a ladder logic program to implement thi Inputs on IB16: PBI: bit 0: PB2: bit 1: TOG1: bit 2: TOG2: bit 3: PSI: bit 4: LSI: bit 5