Mitsubishi Electric MELSEC FX3U - FNC257 - BAND; Dead Band Control

703
FX3G/FX3U/FX3UC Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
29 Data Table Operation – FNC250 to FNC269
29.2 FNC257 – BAND / Dead Band 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
29.2 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
2. Set data
3. Applicable devices
Explanation of function and operation
1. 16-bit operation (BAND and BANDP)
Depending on how the input value (16-bit binary value) specified by compares to the dead band range
between and , the output value is controlled.
Operand Type Description Data Type
Lower limit value of the dead band (no-output band)
16- or 32-bit binary
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
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 257
BAND
D
Mnemonic Operation Condition
16-bit Instruction
9 steps
BAND
BANDP
Mnemonic Operation Condition
Continuous
Operation
Pulse (Single)
Operation
32-bit Instruction
17 steps
DBAND
DBANDP
Continuous
Operation
Pulse (Single)
Operation
S 1
S 2
S 3
D
S 1
S 2
S 3
D
S 3
S 1 S 2 D
FNC257
BAND
Output
( )
Lower limit value of
dead band
S 1 
S 2 
D 
S 3 
Input
value
Output value
Command
input
 In the case of “ Lower limit value > Input value” .... Input value − Lower limit value → Output value
 In the case of “ Upper limit value < Input value” .... Input value − Upper limit value → Output value
 In the case of “ Lower limit value ≤ Input value ≤ Upper limit value” .................................0 → Output value
S 1 
S 2 
S 1 
S 3 
S 3 
S 3  S 2 
S 3 
S 3 
S 1 
S 2 
D 
D 
D 
Output value( )
Output
D 
Input value ( )S 3 
S 1 
Upper limit value of
dead band
( )
S 2 
Output value = 0