Fnc257 - Band / Dead Band Control - Mitsubishi Electric MELSEC FX3U Programming Manual

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
29.2 FNC257 – BAND / Dead Band Control
Outline
This instruction provides the upper limit value and lower limit value of the dead band for an input numeric
value, and controls the output value using these limit values.
1. Instruction format
FNC 257
D P
BAND
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
Explanation of function and operation
1. 16-bit operation (BAND and BANDP)
Depending on how the input value (16-bit binary value) specified by
between and
S
1
Command
input
FNC257
BAND
S
In the case of " Lower limit value >
1
S
In the case of " Upper limit value <
2
Lower limit value ≤
S
In the case of "
1
Output value
Mnemonic
16-bit Instruction
BAND
9 steps
BANDP
Lower limit value of the dead band (no-output band)
Upper limit value of the dead band (no-output band)
Input value controlled by the dead band
Device number storing the output value controlled by the dead band
Digit Specification
, the output value
S
2
S S S
1
2 3
S
3 Input value" ....
S
3 Input value" ....
S Input value ≤
3
Lower limit value of
dead band
(
Input
value
Output
Output value = 0
29 Data Table Operation – FNC250 to FNC269
29.2 FNC257 – BAND / Dead Band Control
Operation Condition
32-bit Instruction
Continuous
17 steps
Operation
Pulse (Single)
Operation
Description
Word Devices
Special
System User
Unit
V Z Modify K H
S
3
is controlled.
D
D
S Input value − S
3 1
S Input value − S
3 2
S Upper limit value" .................................0 →
2
Output value( D )
Output
S )
1
Upper limit value of
dead band
Mnemonic Operation Condition
DBAND
Continuous
Operation
DBANDP
Pulse (Single)
Operation
Data Type
16- or 32-bit binary
Others
Con- Real Charac-
Index
stant Number ter String
E " "
compares to the dead band range
Lower limit value → D
Output value
Upper limit value → D
Output value
D
Output value
Input value ( S )
3
( S )
2
21
22
23
24
25
Pointer
P
26
27
28
29
30
703