655
FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
29 Data Table Operation – FNC250 to FNC269
29.1 FNC256 – LIMIT / Limit Control
21
FN
C
160-FN
C
169
R
eal
Ti
m
e
C
loc
k
C
ont
ro
l
22
FN
C
170
-F
N
C
17
9
E
xt
e
rnal
D
evi
ce
23
FN
C
180
Su
b
st.
I
n
str
. I
n
fo
24
FN
C
181-FN
C
189
O
ther
s
25
FN
C
190-FN
C
19
9
B
loc
k D
a
ta
O
per
at
io
n
26
FN
C
200-FN
C
209
C
har
act
e
r St
ring
C
ont
ro
l
27
F
N
C2
10
-F
NC
21
9
Da
ta
O
per
at
ion 3
28
FN
C
220-FN
C
24
9
Da
ta
Co
m
p
a
ris
o
n
29
FN
C
250-FN
C
269
Da
ta
T
a
b
le
O
per
at
io
n
30
FN
C
27
0-F
N
C
274
Ex
-D
ev
ic
e
In
ve
rte
r C
o
mm
s
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
2. Set data
3. Applicable devices
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
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
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
3
3
3
3
3 3 3 3
3
3
3 3
3
3
3
3
3 3 3 3
3
3
3 3
3
3
3
3
3 3 3 3
3
3
3
3
3
3 3 3 3
3
3
P
FNC 256
LIMIT
D
Mnemonic
Operation Condition
16-bit Instruction
9 steps
LIMIT
LIMITP
Mnemonic
Operation Condition
Continuous
Operation
Pulse (Single)
Operation
32-bit Instruction
17 steps
DLIMIT
DLIMITP
Continuous
Operation
Pulse (Single)
Operation
S
1
S
2
S
3
D
S
1
S
2
S
3
D