Fnc256 - Limit / Limit Control - Mitsubishi Electric MELSEC FX3U Programming Manual

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
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
FNC 256
D P
LIMIT
2. Set data
Operand Type
S
1
S
2
S
3
D
3. Applicable devices
Bit Devices
Oper-
and System User
Type
X Y M T C S D .b KnX KnY KnM KnS T C D R U \G
S
1
S
2
S
3
D
Mnemonic
16-bit Instruction
LIMIT
9 steps
LIMITP
Lower limit value (minimum output value)
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
Digit Specification
29 Data Table Operation – FNC250 to FNC269
Operation Condition
32-bit Instruction
Continuous
17 steps
Operation
Pulse (Single)
Operation
Description
Word Devices
Special
System User Index
Unit
V Z Modify K H
29.1 FNC256 – LIMIT / Limit Control
Mnemonic Operation Condition
DLIMIT
Continuous
Operation
DLIMITP
Pulse (Single)
Operation
Data Type
16- or 32-bit binary
Others
Con- Real Charac-
stant Number ter String
E " "
21
22
23
24
25
Pointer
P
26
27
28
29
30
699