1 The typical operating cycle of the PLC called a scan consists of 3 parts 1. input scan, 2 Program scan, 3 Output scan Briefly describe what is accomplished in each part?

2. What are 3 of the reasons and factors that explain why personal computersare being used with greater and greater frequency for industrial control applications

3. Construct a ladder logic diagram for the following Boolean logic equations

Y=(X1+X2).X3 Y=(X1+X2).(X3+X4) Y=(X1.X2) +X3