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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 initiate execution on the rising edge of 'Execute'. Execution will continue until completion independent of the 'Execute' value (or values) following initiation. Once execution is complete, the function block can be rearmed or reengaged by introducing another rising edge of 'Execute'.
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 FunctionA function calculates a result according to the current value of its inputs. A function has no internal data and is not linked to declared instances. 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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