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Function Block Variables

Variables​

  1. To add variables to the Function Block, in the Function Block window, expand the Function Block and double left-click Variable[?].
  • The variable in the Function Block folder is a local variable that only works in the current Function Block folder.

Add Input, Output, & I/O​

  1. To add a new input, output, or I/O device to the Function Block, left-click Add Input(I).

  • The added option will appear in the Function Block.
    • I/O: Input, Output, or I/O can be selected.
      • Input: Read integer value or data register address.
      • Output: Write data register address only.
      • I/O: One data register address can be used for both input and output.
      • The following data registers CANNOT be used for Output or I/O:
        • X, F, T, TC, TS, C, CC, CS
    • Type:
      • B: BOOL, 0 or 1
      • W: WORD, Unsigned 0 ~ 65,535, Signed -32,768 ~ 32767
      • DW: DWORD, Unsigned 0 ~ 4,294,967,295, Signed -2,147,483,648 ~ 2,147,483,647
      • F: REAL, -1.7014118e+38 ~ 3.4028237e+38 (2-127 ~ 2128)
    • Device:
      • Data register to be set up for each input or output.
      • This can only be set in the ladder.
    • Description:
      • Maximum 16 characters can be used to provide a description for the variable.