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Unless specified otherwise in the function block's description, the input parameters are read with the rising edgeA rising edge is the transition of a digital signal from low to high. It is also called positive edge of the Execute input.
The input parameters can be as follows:
These FBs will be executed on the rising edge. They will continue to execute until completed, but is based on the rising edge of this input only. So once activated, this FB executes even if the input is off or on.
These FBs will continuously be executed every PLC"Programmable Logic Controller" A Programmable Logic Controller, PLC, or Programmable Controller is a digital computer used for automation of industrial processes, such as control of machinery on factory assembly lines. Used to synchronize the flow of inputs from (physical) sensors and events with the flow of outputs to actuators and events cycle, as long as the EnableEnable signal for the drive, Hardware-Enable with 24V signal to X8, Software-Enable command by setup Software, fieldbus or permanently set. Both are required for enabling the drive. remains high.
This is very similar to ENABLE on Function blocks. But, as already explained in Difference between Functions and Function Blocks, functions are expected to complete in one cycle.
For the list of input parameters and its description for PLCopenA vendor -and product- independent worldwide association active in Industrial Control and aiming at standardizing PLC file formats based on XML Function/Function Blocks, see "List of Input Parameters"
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