Rockwell Automation AutoMax Enhanced Ladder Language Reference Manual - Manual (Page 284)

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A.3.2 Global Variables
Global variables can be referenced by ladder, Control Block, or BASIC programs in a
rack. These variables can refer to memory locations, physical I/O locations, or network
locations. Global memory variables can be of any data type supported by the Editor. If
you type in the first letter of a variable name using upper case, the default scope will be
global.
Global variables used for physical I/O must be simple variables. They can be either
Boolean, integer, or double integer.
Global I/O variables repĆ
resenting this:
Can be:
inputs read but not written to
outputs read or written to
Within BASIC or Control Block programs, use the statement COMMON to access global
variables.