Incremental Mode
Incremental mode manipulates one element of the array each time the instruction’s rung-condition-in goes from false to true.
The following timing diagram shows the relationship between status bits and instruction operation. Execution occurs only in a scan in which the rung-condition-in goes from false to true. Each time this occurs, only one element of the array is manipulated. If the rung-condition-in remains true for more than one scan, the instruction only executes during the first scan
The .EN bit is set when rung-condition-in is true. The .DN bit is set when the last element in the array has been manipulated. When the last element has been manipulated and the rung-condition-in goes false, the .EN bit, the .DN bit, and the .POS value are cleared.
The difference between incremental mode and numerical mode at a rate of one element per scan is:
- Numerical mode with any number of elements per scan requires only one false-to-true transition of the rung-condition-in to start execution. The instruction continues to execute the specified number of elements each scan until completion regardless of the state of the rung-condition-in.
- Incremental mode requires the rung-condition-in to change from false to true to manipulate one element in the array.
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