All bits without ‘1’ are assumed to be ‘0’. This makes it easier to read how the lights will behave. Note that I have color-coded the outputs that will be on in the sequence. Let’s look at the sequence that we are controlling – Building a PLC Program – Traffic Light Part 4 will now continue with the programming of the logic in the PLC. We looked at the sequence of operations using Input, output, and mask tables. Part 3 returned to the traffic light application and expand our program significantly. Part 2 used indirect addressing for inputs as well as output to control the sequence of pneumatic (air) cylinders in the program. In part 1 we looked at writing PLC programs to control a traffic light using discrete bits and then using timed sequencing using indirect addressing.
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