Wuhan Huazhong Numerical Control Co., Ltd HNC-18iT v4.0 Programming Manual page 140

Explanation Explanation Explanation Explanation
To check whether the variable is defined in the program, the format is as follows:
1)
AR [#Variable number]
Return:
When it is macro call (subprogram or canned cycle) with G code, the system
2)
would copy the system variables (A~Z) to local variables #0-#25 in the macro.
Meanwhile, the system can copy the axis position (machine coordinate value in
absolute command) of nine channels to local variables #30-#38.
When calling a subprogram,
3)
4) When calling a canned cycle, the canned cycle does not modify the system mode.
0 – the variable is not defined
90 – the variable is defined as absolute command G90
91 – the variable is defined as incremental command G91
the subprogram can modify the system mode.
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11. Custom Macro