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4-24 Micro PLC Programmer’s Guide – April 1994
GFK-0804B
Subtraction (SUB)
The Subtraction function subtracts one number from another and places the result in a
specified register.
number – number = register
46132
The numbers can be constants, as in the first subtraction shown on the facing page, or
the contents of register locations in memory. For example, if R1 contains the value 100
and R4 contains the value 57, then register R3 will contain the value 43.
The second number (the number being subtracted) must be smaller than the first.
Otherwise the content of the specified register will “roll over” as shown by these
examples:
1st number 2nd number Total in register
100 – 10 = 90
0 – 1 = 65535
0 – 2 = 65534
The program should check to be sure that the second number is smaller than the first
before subtracting.
Programming Software Instructions
1. Select Math/Move (F5).
2. Select –SUB (F2) from the Math/Move function keys.
3. First, enter the number to be subtracted from. This can be either a constant, or a
register location that will contain the number. For example: R001. Then press the
Enter key.
4. Enter the number to be subtracted. This can also be a constant or a register location.
Press the Enter key.
5. Enter a register location to contain the result. Press the Enter key.