344 Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
Chapter 8 Array (File)/Misc. Instructions (FAL, FSC, COP, CPS, FLL, AVE, SRT, STD, SIZE)
You can mix data types, but loss of accuracy and rounding error might occur and
the instruction takes more time to execute. Check the S:V bit to see whether the
result was truncated.
For relay ladder instructions, bold data types indicate optimal data types. An
instruction executes faster and requires less memory if all the operands of the
instruction use the same optimal data type, typically DINT or REAL.
Selecting Mode of
Operation
For FAL and FSC instructions, the mode tells the controller how to distribute the
array operation.
All Mode
In All mode, all the specified elements in the array are operated on before
continuing on to the next instruction. The operation begins when the
instruction’s rung-condition-in goes from false to true. The position (.POS) value
in the control structure points to the element in the array that the instruction is
currently using. Operation stops when the .POS value equals the .LEN value.
If You Want To Select This Mode
Operate on all of the specified elements in an array before
continuing on to the next instruction
All
Distribute array operation over a number of scans
Enter the number of elements to operate on per scan (1-
2147483647)
Numerical
Manipulate one element of the array each time the rung-
condition-in goes from false to true
Incremental
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