656
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
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
.
• When controlling the output value using only the lower limit value, set “32767” to the upper limit value
specified in
.
S
3
S
1
S
2
D
FNC256
LIMIT
S
1
S
2
D
S
3
Input
value
Output
value
Input
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” .... Input value
→
Output value
S
1
S
3
S
1
D
S
2
S
3
S
2
D
S
3
S
2
S
3
D
S
1
D
S
2
S
3
S
1
Specified
Specified
S
1
S
2