Numerical Mode

Numerical mode distributes the array operation over a number of scans. This mode is useful when working with non-time-critical data or large amounts of data. You enter the number of elements to operate on for each scan, which keeps scan time shorter.

Execution is triggered when the rung-condition-in goes from false to true. Once triggered, the instruction is executed each time it is scanned for the number of scans necessary to complete operating on the entire array. Once triggered, rung-condition-in can change repeatedly without interrupting execution of the instruction.

Avoid using the results of a file instruction operating in numerical mode until the .DN bit is set.

The following timing diagram shows the relationship between status bits and instruction operation. When the instruction execution is complete, the .DN bit is set.

If the rung-condition-in is true at completion, the .EN and .DN bit are set until the rung-condition-in goes false. When the rung-condition-in goes false, these bits are cleared and the .POS value is cleared.

If the rung-condition-in is false at completion, the .EN bit is cleared immediately. One scan after the .EN bit is cleared, the .DN bit and the .POS value are cleared.