Counting: Count-up and count-down functions increase or decrease the counter value on every transition of the input. Once triggered, the timer will turn its associated output ON (on-delay) or OFF (off-delay) after the set time has elapsed. Timing: Timer instructions are available to allow for on-delayed or off-delayed events. To put it simply, rung 5 in our code needs CR1(C1) AND CR2(C2) to turn ON motor M1 (Y002). Boolean Logic: The ON/OFF, TRUE/FALSE algebra of binary systems, the basics of which are AND, OR and NOT operators. So to answer the question, let’s look at a few examples: The structure of the program is still ladder with the more complex instructions being function blocks. So what logic can ladder logic actually perform? With the increasing demand for functionality and ease of use, many of today’s PLCs incorporate function blocks with ladder logic.
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