Fnc257 - Band / Dead Band Control - Mitsubishi Electric FX3G SERIES Programming Manual
Programmable controllers
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Also See for FX3G SERIES:
- User manual (532 pages) ,
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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
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
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
S
and
S
1
2
Command
input
S
S
"
>
1
3
S
S
"
<
2
3
≤
S
S
"
1
3
Output value
666
Mnemonic
16-bit Instruction
P
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
D
FNC257
S
S
1
2
BAND
→
S
S
D
" ....
-
3
1
→
S
S
D
" ....
-
3
2
≤
" ............0 →
S
D
2
Input
value
Operation Condition
Continuous
Operation
Pulse (Single)
Operation
Description
Word Devices
Special
System User
Unit
T
C D R U \G
S
is controlled.
S
D
3
Output value(
Lower limit value of
dead band
(
S
)
1
Output
Output value = 0
29 Data Table Operation – FNC250 to FNC269
29.2 FNC257 – BAND / Dead Band Control
Mnemonic
32-bit Instruction
DBAND
17 steps
DBANDP
Con-
Real
Index
stant
Number
V
Z Modify K
H
compares to the dead band range between
3
D
)
Output
Input value (
Upper limit value of
dead band
Operation Condition
Continuous
Operation
Pulse (Single)
Operation
Data Type
16- or 32-bit binary
Others
Charac-
Pointer
ter String
E
" "
P
S
)
3
(
S
)
2
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