6.4.4 Real number comparison
Operand
Input / output
Data type
Input
ID, QD, MD, SD, SMD, VD, LD, AC, constant, *VD, *LD, *AC
Real number
Comparison real number instructions are used for
comparing two values ： IN1 and IN2.
Comparison includes ： IN1 = IN2 、 IN1 >= IN2 、 IN1 <= IN2 、 IN1 >
IN2 、 IN1 < IN2 or IN1 <> IN2.Real number comparison with
symbol.
In LAD, when the comparison result is true, the contact
will be open.
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.
Example:
89
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