Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 221

■Applicable devices
Operand Bit
X, Y, M, L, J\
SM, F, B, SB,
FX, FY
(s1)  
 
(s2)
• In safety programs executed by the Safety CPU, only the following safety devices and constants can be used.
Operand Bit
SA\X, SA\Y, SA\M, SA\SM, SA\B

(s1)

(s2)
Processing details
• These instructions perform a comparison operation between the 16-bit binary data in the device specified by (s1) and the
16-bit binary data in the device specified by (s2). (Devices are used as normally open contacts.)
• The following table lists the comparison operation results of each instruction.
Instruction symbol (ladder, FBD/LD)
=(_U), EQ(_U)
<>(_U), NE(_U)
>(_U), GT(_U)
<=(_U), LE(_U)
<(_U), LT(_U)
>=(_U), GE(_U)
=(_U), EQ(_U)
<>(_U), NE(_U)
>(_U), GT(_U)
<=(_U), LE(_U)
<(_U), LT(_U)
>=(_U), GE(_U)
• When hexadecimal constants are used for (s1) and (s2) and the numerical value (8 to F) whose most significant bit (b15) is
1 is specified as a constant, the value is considered as a negative binary value in comparison operation.
• If the LD instruction is used in the program written in FBD/LD, use a left rail or a variable/constant which is always on for
EN.
• If the OR instruction is used in the program written in FBD/LD and EN is set to TRUE, ENO turns on. EN will not be an
execution condition.
Operation error
There is no operation error.
Word
T, ST, C, D, W, U\G, J\,
SD, SW, FD, R, U3E\(H)G
ZR, RD
 
 
Word
SA\T, SA\ST, SA\C, SA\D, SA\W, SA\SD


Condition
(s1)=(s2)
(s1)(s2)
(s1)>(s2)
(s1)(s2)
(s1)<(s2)
(s1)(s2)
(s1)(s2)
(s1)=(s2)
(s1)(s2)
(s1)>(s2)
(s1)(s2)
(s1)<(s2)
Double word Indirect
specification
Z LT, LST, LZ
LC
   
   
Result
Continuity state (ENO is on.)
Non-continuity state (ENO is off.)
6 BASIC INSTRUCTIONS
6.1 Comparison Operation Instructions
Constant Others
K, H E $
   
   
Constant
K, H


6
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