Mitsubishi Electronics FX3G User Manual
661
FX
3S
/FX
3G
/FX
3GC
/FX
3U
/FX
3UC
Series
Programming Manual - Basic & Applied Instruction Edition
29 Data Table Operation – FNC250 to FNC269
29.1 FNC256 – LIMIT / Limit Control
21
FNC160
-F
NC1
69
69
R
eal
T
T
ime C
lock
C
ontrol
22
FNC17
0-F
NC
179
179
E
xternal D
evice
23
FNC
180
Alternate
Instructions
24
FN
C181-
FNC18
9
O
thers
25
FNC190
-F
NC1
99
99
Bl
oc
k D
ata
ata
Op
er
er
ation
26
FNC20
0-F
NC209
C
har
ac
te
r S
trin
g
Con
tro
tro
l
27
FNC2
10-
FNC21
10-
FNC21
9
Dat
a
a
Operati
on 3
28
FNC220
-F
NC2
49
49
Da
ta
C
omp
ari
ari
son
29
FNC25
0-F
N
C
269
D
ata T
abl
e
e
Operation
30
FNC2
70-
FNC276
FNC276
Ex
-Dev
ice
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.
value using these limit values.
1. Instruction format
2. Set data
3. Applicable devices
Explanation of function and operation
1. 16-bit operation (LIMIT and LIMITP)
Depending on how the input value (16-bit binary value) specified by
compares to the range between
and
, the output value
is controlled.
The output value is controlled as shown below:
• When controlling the output value using only the upper limit value, set “-32768” to the lower limit value specified in
.
Operand Type
Description
Data Type
Lower limit value (minimum output value)
16- or 32-bit binary
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
values
Oper-
and
Type
Bit Devices
Word Devices
Others
System User
Digit Specification
System User
Special
Unit
Index
Con-
stant
stant
Real
Number
Charac-
ter String
Pointer
X Y M T C S D .b KnX KnY KnM KnS T C D R U \G
V Z Modify K H
E
" "
P
P
FNC 256
LIMIT
D
Mnemonic
Operation Condition
16-bit Instruction
9 steps
LIMIT
LIMITP
LIMITP
Mnemonic
Operation Condition
Continuous
Operation
Pulse (Single)
Pulse (Single)
Operation
32-bit Instruction
17 steps
DLIMIT
DLIMITP
DLIMITP
Continuous
Operation
Pulse (Single)
Pulse (Single)
Operation
S
1
S
2
S
3
D
S
1
S
2
S
3
D
S
3
S
1
S
2
D
FNC256
LIMIT
S
1
S
2
D
S
3
Input
value
value
Output
value
value
Input
value
value
Output
value
(
)
(
)
Command
input
In the case of “ Lower limit value > Input value” .... Lower limit value
→ Output value
In the case of “ Upper limit value < Input value” .... Upper limit value
→ Output value
In the case of “ Lower limit value
≤ Input value ≤ Upper limit value”
S
1
S
3
S
1
D
S
2
S
3
S
2
D
S
3
S
2
S
1
D
S
2
S
3
S
1
Specified
Specified
.... Input value
→ Output value
S
3
D
S
1