6.4 Compare
6.4.1 Byte compare
Operand
Input / output
Data type
Input
IB, QB, MB, SMB, VB, SB, LB, AC, constant, *VD, *LD, *AC
byte
Byte comparison instructions are used for comparing two
values ： IN1 and IN2.
Comparison includes ： IN2 、 IN1 >= IN2 、 IN1 <= IN2 、 IN1 > IN2 、 IN1
< IN2 or IN1 <> IN2. Byte comparison without symbol.
In LAD, the contact is open when the result is 1.
Attention ：
The following conditions are serious errors .These errors will
cause the PLC to immediately stop the execution of the
program:
1. Enter illegal indirect address.
2.Enter the illegal real number
85
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