FANUC Series 16/18/160/180-Model C for Lathe Operator Manual

PROGRAMMING
16. CUSTOM MACRO
B–62754EN/01
287
Brackets are used to change the order of operations. Brackets can be used
to a depth of five levels including the brackets used to enclose a function.
When a depth of five levels is exceeded, alarm No. 118 occurs.
Example) #1=SIN [ [ [#2+#3] *#4 +#5] *#6] ;
(1)
(2)
(3)
(4)
(5)
(1) to (5) indicate the order of operations.
Brackets ([, ]) are used to enclose an expression. Note that parentheses
are used for comments.
Errors may occur when operations are performed.
Table 16.3(b) Errors involved in operations
Operation
Average
error
Maximum
error
Type of error
a = b*c 1.55×10
–10
4.66×10
–10
a = b / c 4.66×10
–10
1.88×10
–9
1.24×10
–9
3.73×10
–9
a = b + c
a = b – c
2.33×10
–10
5.32×10
–10
a = SIN [ b ]
a = COS [ b ]
5.0×10
–9
1.0×10
–8
a = ATAN [ b ] / [ c ] (*4) 1.8×10
–6
3.6×10
–6
NOTE
1 The relative error depends on the result of the operation.
2 Smaller of the two types of errors is used.
3 The absolute error is constant, regardless of the result of the
operation.
4 Function TAN performs SIN/COS.
D Bracket nesting

D Brackets
D Operation error
a + b
Ǹ
Relative error(*1)
ε
b
Min
(*2)
ε
b
ε
c
ε
Absolute error(*3)
degrees

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