The Prime Variable microblock identifies a single specific value from the control program that is representative of the entire control program, such as the current zone temperature.
Every control program has a color and a prime variable. Their values are set in the control program logic by the Set Color and Prime Variable microblocks. If these microblocks are not present in the control program, their corresponding values will be zero. It is a good idea to provide meaningful values for these two numbers so that generic graphics or reports will have something meaningful to display for your control program.
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