NCT Group 99M, 2000M manual Vacant Variables, Numerical Format of Variables

20 Custom Macro

–Referring to program number O, block number N or conditional block / by a variable is not permissible. Address N will be regarded as a block number if it is preceded only by address "/" in the block.

–The number of a variable may not be substituted for by a variable, i.e. ##120 is not permissible. The correct specification is #[#120].

–If the variable is used behind an address, its value may not exceed the range of values permissible for the particular address. If, e.g., #112=5630, reference M#112 will produce an error message.

–If the variable is used behind an address, its value will be rounded to a significant digit corresponding to the address. For example,

M#112	will be	M1	for	#112=1.23
M#112	will be	M2	for	#112=1.6

20.11.3 Vacant Variables

A variable that has not been referred to (undefined) is vacant. Variable #0 is used for a variable that is always vacant:

#0=<vacant>

20.11.4 Numerical Format of Variables

Each variable is represented by 32 bits of mantissa and 8 bits of characteristic,

variable= M*2C
Representation of a vacant variable,		M=0, C=0
Representation of a 0 - value variable,		M=0, C=–128
The nature of a vacant variable, compared in an address:
Reference to a vacant variable in an address:
If #1=<vacant>	if #1=0
G90 X20 Y#1	G90 X20 Y#1
*	*
G90 X20	G90 X20 Y0
Vacant variable in a definition instruction:
if #1=<vacant>	if #1=0
#2=#1	#2=#1

**

#2=<vacant>#2=0

#2=#1*3#2=#1*3

**

#2=0#2=0

#2=#1+#1#2=#1+#1

**

#2=0#2=0

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