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Handling Different Array lengths with One AOI.

Handling Different Array lengths with One AOI.

By An Nguyen A PLC programmer may want to create an Add-on Instruction as part of a project.  This can make code re-usable, more compact or just more readable.  Passing an array into an AOI is possible, but when the array to be passed is of unknown length, some tricks...
Using TONR in Structured Text

Using TONR in Structured Text

Four Simple Rules for Using TONR in Structured Text By Douglas Taylor After struggling with using the TONR instruction within structured text in Logix 5000, I have empirically devised four rules that takes the mystery out of it.  These are: 1. You can call TONR...