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4-41GFK-0804B Chapter 4 The Micro PLC Instruction Set
Exclusive OR (XOR)
The XOR function compares each bit in the first specified register against each
corresponding bit in the second specified register. If both bits are the same (1 or 0), it
places a 0 in the corresponding bit of the third register. If the bits are different, it places a
1 in the corresponding location in the third register.
Example:
0 0 0 0 0 0 0 0 1 0 1 0 1 0 1 0
R1
(170)
0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1
R2
(15)
0 0 0 0 0 0 0 0 1 0 1 0 0 1 0 1
R3
(165)
XOR
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Programming Software Instructions
1. Select Logic (F7)
2. Select XOR (F3) from the Logic function keys.
3. Enter the register location of the first number to be XORed. Press the Enter key.
4. Enter the register location of the second number to be XORed. Press the Enter key.
5. Enter a register for the result to be placed in. Press the Enter key.
Example and HHP Instructions
Ladder Diagram Hand-held Programmer
START
LOGIC
OUT
F3
F1
R1
R2
R3
[ R1 O R2! R3]
R
X
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