Arithmetic Test

The arithmetic and comparison blocks are tested in this section. For this test, a CTU counter was added to each one of the four inputs. The CV variable for each CTU was wired to arithmetic blocks to perform the following equation:

$\frac{\mathrm{C}\mathrm{T}\mathrm{U}0.\mathrm{C}\mathrm{V}+\mathrm{C}\mathrm{T}\mathrm{U}1.\mathrm{C}\mathrm{V}}{\mathrm{C}\mathrm{T}\mathrm{U}2.\mathrm{C}\mathrm{V}-\mathrm{C}\mathrm{T}\mathrm{U}3.\mathrm{C}\mathrm{V}}$

The result of the arithmetic expression goes to two Comparator blocks. If the result is greater than 3 or less than -3, the output is set to true. The ladder diagram for this test segment is shown below.