• General
• Local variables - VAR
• Input variables - VAR_INPUT
• Output variables - VAR_OUTPUT
• Input/Output Variable (VAR_IN_OUT)
• Global variables - VAR_GLOBAL
• Temporary variable - VAR_TEMP
• Static variables - VAR_STAT
• External variables - VAR_EXTERNAL
• Instance variables - VAR_INST
• Configuration variables - VAR_CONFIG
• Constant Variables - 'CONSTANT'
• Persistent Variable - PERSISTENT
• Retain Variable - RETAIN
• SUPER
• THIS