Question $1$:

a$)$ With reference to Error! Reference source not found. below: Compare the three lines of

code in lines $27$ to $29,$ with the four lines of code in lines $23$ to $26.$ Clearly, a line of code is

missing when the Next button is used in lines $27$ to $29.$

$(5$ marks$)$

Identify and write down the line of missing code.

Clearly describe the problem the missing code will create and

Write down the correct code, identifying them clearly as lines $27-30.$

b$)$ Compile a complete flow chart for the corrected Program $1,$ using appropriate software.

Remember:

a flow$-$chart is a helicopter view, highlighting the salient flow through the program, but

hiding all detail $($that is not pertinent to flow$)$;

being a PLC program, probably run with repetitive scan cycles, flow charts for such

programs are often drawn to have a Start, but no End.