Rockwell Automation GMLC Reference Manual - Manual (Page 511)

Publication GMLC-5.2 - November 1999
474 The Expression Builder
Because all system variables are strings of standard ASCII characters,
you can type them directly into the expression from the keyboard.
The GML Commander system variables are described in the following
chapters. For presentation purposes, they are grouped by function into the
following groups:
• Motion variables.
• Controller variables.
• Fault variables.
• Status variables.
• Diagnostic variables.
• System functions.
• Mathematical functions.
• User variables.