![]() When the value reaches zero the timer's flag turns ON to indicate that it has expired. When the timer turns on it will begin counting and the PV (process value) will start from 300 and count down. If you use a BCD type 100ms timer and assign its SV (setpoint value) a BCD value of 300 then you have created a timer with a 30 second limit (300 x 100ms). These show time diagrams of most of the instructions and how each of the parameters and flags operate.įor example, a basic timer (TIM) works by assigning it a value. If you have CX-Programmer, a much better place to get information is the Instruction Reference (Help -> Instruction Reference -> yourPLC). Think of flags as interchangeable with the term "bit", "boolean", etc. PLCs are like any program - data is stored as different types. ![]()
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