Rievtech PR-12 Series, User Manual And Programmers Manual

Page: 92 / 260

85
6.4 Compare
6.4.1 Byte compare
Input / output
Operand
Data type
Input IB, QB, MB, SMB, VB, SB, LB, AC, constant, *VD, *LD, *AC byte
output
（
FBD
）
I, Q, M, SM, T, C, V, S, L, Boolean
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.