660
FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
29 Data Table Operation – FNC250 to FNC269
29.2 FNC257 – BAND / Dead Band Control
2. 32-bit operation (DBAND and DBANDP)
Depending on how the input value (32-bit binary value) specified by [
+1,
] compares to the dead
band range between [
+1,
] and [
+1,
], the output value [
+1,
] is controlled.
The output value is controlled as shown below:
Caution
• When the output value overflows, it is handled as follows:
- In the 16-bit operation
The output value is a 16-bit binary value with sign. Accordingly, if the operation result is outside the
range from -32768 to +32767, it is handled as follows:
- In the 32-bit operation
The output value is a 32-bit binary value with sign. Accordingly, if the operation result is outside the
range from -2,147,483,648 to +2,147,483,647, it is handled as follows:
Error
An operation error is caused when the instruction is executed in the setting status shown below; The error flag
M8067 turns ON, and the error code (K6706) is stored in D8067.
Relationship
16-bit operation
>
32-bit operation
[
+1,
]
>
[
+1,
]
S
3
S
3
S
1
S
1
S
2
S
2
D
D
FNC257
DBAND
+1,
+1,
+1,
+1,
+1,
+1,
+1,
+1,
+1,
+1,
+1,
+1,
+1,
+1,
[
]
[
]
S
1
S
2
S
3
D
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
+1,
D
D
+1,
S
3
S
3
Output value
Input
value
Output
value
Input value
S
1
S
1
S
3
S
3
S
2
S
2
S
3
S
3
S
3
S
3
S
1
S
1
S
2
S
2
S
3
S
3
S
3
S
3
S
1
S
1
S
2
S
2
D
D
D
D
D
D
Output
Output
Lower limit value of
dead band
Output value = 0
Upper limit value of
dead band [
]
+1,
S
2
S
2
[
]
+1,
S
1
S
1
Lower limit value of dead band = 10
Input value = -32768
Output value = -32768-10
= 8000H-AH
= 7FF6H
= 32758
S
1
S
3
Lower limit value of dead band ( +1, ) = 1000
Input value ( +1, ) = -2,147,483,648
Output value = -2,147,483,648-1000
= 8000000H-000003E8H
= 7FFFFC18H
= 2,147,482,648
S
1
S
3
S
1
S
3
S
1
S
2
S
1
S
1
S
2
S
2
