Fnc256 - Limit / Limit Control - Mitsubishi Electric FX3G SERIES 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
S
1
S
2
S
3
D
Explanation of function and operation
1. 16-bit operation (LIMIT and LIMITP)
Depending on how the input value (16-bit binary value) specified by
and S , the output value
2
The output value is controlled as shown below:
Command
input
FNC256
LIMIT
In the case of " S Lower limit value >
1
In the case of " Upper limit value <
S
2
S
Lower limit value ≤
1
In the case of "
Output
value
• When controlling the output value using only the upper limit value, set "-32768" to the lower limit value specified in
S .
1
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
D is controlled.
S S
S
1 2 3
S Input value" ....
3
S Input value" ....
3
S
Input value ≤
3
Input
value
S Specified
1
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
Unit
T C D R U \G V
S
3
D
Lower limit value →
S
1
Upper limit value →
S
2
S
2
Upper limit value" ....
Output
( D )
value
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-
Index
stant Number ter String
Z Modify K H E " "
compares to the range between
D Output value
D Output value
S Input value → D
3 Output value
Specified
S
2
Input
( S )
3
value
21
22
23
24
25
Pointer
P
26
27
S
1
28
29
30
663