Global variables

Global variables can be shared between all functions in a project. The Global instruction is used to declare a global variable.

To declare global variables in a program, use the Global instruction with the desired variable type (Boolean, Byte, UByte, Integer, Short, UShort, Long, Int32, UInt32, Int64, UInt64, Real, Double, String) at the beginning of the program before any Function statements:

Boolean, Byte, UByte, Integer, Short, UShort, Long, Int32, UInt32, Int64, UInt64, Real, Double, String

See details below.

Date Types

Add "Static" or "NonStatic" to the beginning of the declaration to change the initialization timing.

• If not specified: Based on the setting in [Setup]-[System Configuration]-[Controller]-[Initialize global variables when function starts].

  See details below.

  [Setup]-[System Configuration]-[Controller]-[Preferences] Page

• Static: Initialization occurs when first executing the main function after Controller startup.

• NonStatic: Initialization occurs when the executing the main function.

TIP

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To indicate that variables are global, precede the name with “g_” as shown in the example below. With this, you can improve the program readability.

Program: MAIN.PRG

Global Integer g_TotalCycles
Function main
  Call LoadPart
  ...
  ...
Fend

Program: LOADPART.PRG

Function LoadPart
  Jump pick
  On gripper
  Wait .1
  Jump place
  Off gripper
  Wait .1
  g_TotalCycles = g_TotalCycles + 1
Fend