Mitsubishi Electric MELSEC FX3U - FNC224~230 - LD =, >, <, <>, <=, >=; Data Comparison

689
FX3G/FX3U/FX3UC Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
28 Data Comparison – FNC220 to FNC249
28.1 FNC224~230 – LD =, >, <, <>, <=, >= / Data Comparison
21
FNC160-FNC169 Real Time Clock Control
22
FNC170-FNC179 External Device
23
FNC180 Alternate Instructions
24
FNC181-FNC189 Others
25
FNC190-FNC199 Block Data Operation
26
FNC200-FNC209 Character String Control
27
FNC210-FNC219 Data Operation 3
28
FNC220-FNC249 Data Comparison
29
FNC250-FNC269 Data Table Operation
30
FNC270-FNC274 Ex-Device Inverter Comms
28.1 FNC224~230 – LD =, >, <, <>, <=, >= / Data Comparison
Outline
These instructions compare numeric values, and set a contact to ON when the condition agrees so that an
operation is started.
1. Instruction format
2. Set data (common among FNC224 to FNC230)
3. Applicable devices (common among FNC224 to FNC230)
S: This function is supported only in FX3U/FX3UC PLCs.
Operand Type Description Data Type
Device number storing comparison data 16- or 32-bit binary
Device number storing comparison data 16- or 32-bit binary
Oper-
and
Type
Bit Devices Word Devices Others
System User Digit Specification System User
Special
Unit
Index
Con-
stant
Real
Number
Charac-
ter String
Pointer
XYMTCSD
 .b KnX KnY KnM KnS T C D R U\G VZModifyKH E "  "P
33333333 S 33333
33333333 S 33333
FNC 224
LD=
D
Mnemonic Operation Condition
16-bit Instruction
5 steps
LD=
Mnemonic Operation Condition
Continuous
Operation
32-bit Instruction
9 steps
LDD=
Continuous
Operation
FNC 225
LD>
D
Mnemonic Operation Condition
16-bit Instruction
5 steps
LD>
Mnemonic Operation Condition
Continuous
Operation
32-bit Instruction
9 steps
LDD>
Continuous
Operation
FNC 226
LD<
D
Mnemonic Operation Condition
16-bit Instruction
5 steps
LD<
Mnemonic Operation Condition
Continuous
Operation
32-bit Instruction
9 steps
LDD<
Continuous
Operation
FNC 228
LD<>
D
Mnemonic Operation Condition
16-bit Instruction
5 steps
LD<>
Mnemonic Operation Condition
Continuous
Operation
32-bit Instruction
9 steps
LDD<>
Continuous
Operation
FNC 229
LD<=
D
Mnemonic Operation Condition
16-bit Instruction
5 steps
LD<=
Mnemonic Operation Condition
Continuous
Operation
32-bit Instruction
9 steps
LDD<=
Continuous
Operation
FNC 230
LD>=
D
Mnemonic Operation Condition
16-bit Instruction
5 steps
LD>=
Mnemonic Operation Condition
Continuous
Operation
32-bit Instruction
9 steps
LDD>=
Continuous
Operation
S 1
S 2
S 1
S 2