Mitsubishi Electric MELSEC FX3U - FNC256 - LIMIT; Limit Control

699
FX3G/FX3U/FX3UC Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
29 Data Table Operation – FNC250 to FNC269
29.1 FNC256 – LIMIT / Limit Control
21
FNC160- FNC169 Real Time Clock
22
FNC170- FNC179 External Device
23
FNC180 Alternate Instructions
24
FNC181- FNC189 Others
25
FNC190- FNC199 Block Data
26
FNC200- FNC209 Character String
27
FNC210- FNC219 Data
28
FNC220- FNC249 Data
29
FNC250- FNC269 Data Table
30
FNC270- FNC274 Ex-Device
29.1 FNC256 – LIMIT / Limit Control
Outline
This instruction provides the upper limit value and lower limit value for an input numeric value, and controls
the output value using these limit values.
1. Instruction format
2. Set data
3. Applicable devices
Operand Type Description Data Type
Lower limit value (minimum output value)
16- or 32-bit binary
Upper limit value (maximum output value)
Input value controlled by the upper and lower limit values
Head device number storing the output value controlled by the upper and lower
limit values
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 3 333
33333333 3 333
33333333 3 3
3 3 3 3333 3 3
P
FNC 256
LIMIT
D
Mnemonic Operation Condition
16-bit Instruction
9 steps
LIMIT
LIMITP
Mnemonic Operation Condition
Continuous
Operation
Pulse (Single)
Operation
32-bit Instruction
17 steps
DLIMIT
DLIMITP
Continuous
Operation
Pulse (Single)
Operation
S 1
S 2
S 3
D
S 1
S 2
S 3
D