Ladder Logic Programming Tutorial   STEP1      backbutton.gif (507 bytes)  nextbutton.gif (690 bytes)

Before we commence the circuit creation, let us define the I/Os to be used for this program. The following I/Os are required:

Inputs : Start, Stop, Manual, Step
Outputs : Out1, Out2,.... Out8
Relays : Run
Timers : Duration
Sequencer (counter) : Seq1

  1. Click on the tutorial1a3.jpg (1582 bytes) button located on right hand side of the upper status bar to open up the I/O label editing Window. You can also achieve the same with the <F2> function key.

  2. Scroll to the "Inputs" window by using the left/right cursor keys or by clicking on the red color left/right arrow buttons or simply select it from the choice box between the left/right arrow buttons.

  3. Move the deep blue color highlight bar to Input #1 position by clicking on it. Click again to open up a text field for entering the name for Input #1.
tutorial1a1.gif (6749 bytes)
  1. Press <Enter> key again and the highlight bar will be moved to Input #2.


  2. Without using the mouse button, simply start typing the name "Stop" at Input #2. The text field will be automatically opened up at Input #2 for entry. Press <Enter> after typing in the name for "Stop" input.

  3. Complete entry of the other two input label names "Manual" and "Step" as above. Note that TRiLOGI Version 6.2 and up allows I/O label names of up to 16 characters. However, if you wish to keep compatibility with Version 5.x to 6.1x, you should use no more than 10 characters to define the I/O names. Also, white spaces between names are not acceptable and will be automatically converted to the underscore character ( '_' ). e.g. If you enter the name: "F series PLC" for an I/O, it will be accepted as "F_series_P".

  4. After entering label names for Inputs #1 to #4, move to the "Output" table by pressing the right cursor key or by clicking on the right arrow button. Enter all the output and relay label names in their respective I/O tables. We will discuss the "Timer" table in the next step.

IMPORTANT

    1. You can shift the Items in the I/O table up or down or insert a new label between two adjacent, pre-defined labels. Simply press the <Ins> key or Right-Click the mouse button to pop up the "Shift I/O" menu,  which allows you to shift the selected I/O. However, please note that if you shift the I/O down, the last entry in the I/O table (e.g. Input #256) will be lost.

    2. In Trilogi 6.2 and up, shifting of Custom Function Label names will now shift the function content along with the label name. (In previous versions of Trilogi, shifting of the I/O label would not shift the function content, therefore making it untenable to use I/O label shift to reorganize custom functions. Warnings are provided if such an action were to result in overwriting of an existing custom function.

    3. TRiLOGI Version 6.2 and up allows I/O label names of up to 16 characters. However, if you wish to keep compatibility with Version 5.x to 6.1x, you should use no more than 10 characters to define the I/O names.


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