GSK 980MDc, User Manual

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GSK980MDc Milling CNC System User Manual
150
I Programming
ii. When the result of the operation exceeds 3.65×10
47
( j is about 110), an overflow occurs and P/S
alarm is issued.
iii. A constant can be used instead of the # j variable.
7. ROUND function
When the ROUND function is included in an arithmetic or logic operation command, IF statement, or
WHILE statement, the ROUND function rounds off at the first decimal place.
Example:
When #1=ROUND[#2] is executed where #2=1.2345 the value of variable #1 is 1.0.
When the ROUND function is used in NC statement address, the ROUND function rounds off the
specified value according to the least input increment of the address.
8. Rounding up and down to an integer
With CNC, when the absolute value of the integer produced by an operation on a number is greater
than the absolute value of the original number, such an operation is referred to as rounding up to an integer.
Conversely, when the absolute value of the integer produced by an operation on a number is less than the
absolute value of the original number, such an operation is referred to as rounding down to an integer. Be
particular careful when handling negative numbers.
Example:
Suppose that #1=1.2, #2= -1.2
When #3=FUP[#1] is executed, 2.0 is assigned to #3.
When #3=FIX[#1] is executed, 1.0 is assigned to #3.
When #3=FUP[#2] is executed, -2.0 is assigned to #3.
When #3=FIX[#2] is executed, -1.0 is assigned to #3.
5.3.3 Priority of Operations
1. Function
2. Operation such as multiplication and division
（ *, /, AND ）
3. Operation such as addition and subtraction
（
+, -, OR, XOR
）
5.3.4 Bracket Nesting
Brackets are used to change the order of operations. Brackets can be used to multinesting.
Note that the square bracket [, ] is used to enclose an expression; the round bracket
（，）
is used in notes.
When the priority is not defined, it is advised to use square bracket to enclose.
5.4 Branch and Repetition
In a program, the flow of control can be changed using the GOTO statement and IF statement. Three types
of branch and repetition operations are used:
1. GOTO statement (unconditional branch)
2. IF statement (conditional branch: IF…THEN…)
3. WHILE statement (repetition WHILE…)