6 BASIC INSTRUCTIONS
6.1 Comparison Operation Instructions
221
6
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Applicable devices
• In safety programs executed by the Safety CPU, only the following safety devices and constants can be used.
Processing details
• These instructions perform a comparison operation between the 32-bit binary data in the device specified by (s1) and the
32-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.
• When hexadecimal constants are specified for (s1) and (s2) and the numerical value (8 to F) whose most significant bit
(b31) is 1 is specified as a constant, the value is considered as a negative binary value in comparison operation.
• To specify the compare target data, use an instruction which handles 32-bit data, such as the DMOV(P) instruction. If an
instruction which handles 16-bit data, such as the MOV(P) instruction, is used, comparison cannot be performed normally.
• If the LDD
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 ORD
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.
Operand
Bit
Word
Double word Indirect
specification
Constant
Others
X, Y, M, L,
SM, F, B, SB,
FX, FY
J
\
T, ST, C, D, W,
SD, SW, FD, R,
ZR, RD
U
\G
, J
\
,
U3E
\(H)G
Z
LT, LST,
LC
LZ
K, H E
$
(s1)
(s2)
Operand
Bit
Word
Constant
SA\X, SA\Y, SA\M, SA\SM, SA\B
SA\T, SA\ST, SA\C, SA\D, SA\W, SA\SD
K, H
(s1)
(s2)
Instruction symbol (ladder, FBD/LD)
Condition
Result
D=(_U), EQ(_U)
(s1)=(s2)
Continuity state (ENO is on.)
D<>(_U), NE(_U)
(s1)
(s2)
D>(_U), GT(_U)
(s1)>(s2)
D<=(_U), LE(_U)
(s1)
(s2)
D<(_U), LT(_U)
(s1)<(s2)
D>=(_U), GE(_U)
(s1)
(s2)
D=(_U), EQ(_U)
(s1)
(s2)
Non-continuity state (ENO is off.)
D<>(_U), NE(_U)
(s1)=(s2)
D>(_U), GT(_U)
(s1)
(s2)
D<=(_U), LE(_U)
(s1)>(s2)
D<(_U), LT(_U)
(s1)
(s2)
D>=(_U), GE(_U)
(s1)<(s2)
Summary of Contents for MELSEC iQ-R Series
Page 1: ...MELSEC iQ R Programming Manual Instructions Standard Functions Function Blocks ...
Page 2: ......
Page 24: ...22 INDEX 2092 INSTRUCTION INDEX 2093 REVISIONS 2104 WARRANTY 2105 TRADEMARKS 2106 ...
Page 34: ...32 MEMO ...
Page 35: ...33 PART 1 PART 1 OVERVIEW This part consists of the following chapter 1 OVERVIEW ...
Page 68: ...66 1 OVERVIEW 1 5 Precautions on Programming MEMO ...
Page 1448: ...1446 14 REDUNDANT SYSTEM INSTRUCTIONS 14 2 Disabling Enabling System Switching MEMO ...
Page 1972: ...1970 33 TIME DATA TYPE FUNCTIONS 33 4 Division MEMO ...
Page 2067: ...APPX Appendix 5 PID Control Program Examples 2065 A 252 Set PID control data for loop 2 ...
Page 2109: ......