Delta AH500 - Page 470

AH500 Programming Manual
6-302
3. The figures:
Output value
Input value
Output value
Input value
The lower limit value
of the deadband
The upper limit value
of the deadband
BAND is executed.
BAND is not executed.
4. The minimum value of the deadband in S
1
, the maximum value of the deadband in S
2
, the
input value in S
3
, and the output value in D should be within the range described below.
 If the instruction BAND is executed, the minimum value of the deadband in S
1
, the
maximum value of the deadband in S
2
, the input value in S
3
, and the output value in D is
within the range between -32768 and 32767. Suppose the minimum value of the
deadband in S
1
is 10 and the maximum value of the deadband in S
3
is -32768. The
output value in D is calculated as follows.
Output value in D=-32768-10=16#8000-16#000A=16#7FF6=32758
 If the instruction DBAND is executed, the minimum value of the deadband in S
1
, the
maximum value of the deadband in S
2
, the input value in S
3
, and the output value in D is
within the range between -2147483648 and 2147483647. Suppose the minimum value of
the deadband in (S
1
+1, S
1
) is 1000 and the maximum value of the deadband in (S
3
+1, S
3
)
is -2147483648. The output value in (D+1, D) is calculated as follows.
Output value in (D+1, D)
=-2147483648-1000=16#80000000-16#000003E8=16#7FFFFC18
=2147482648
Example 1:
When X0.0 is ON, -1000 or 1000 is subtracted from the binary-coded decimal value in X1, and the
difference is stored in D1.
The execution results:
Minimum
value of the
deadband
Maximum
value of the
deadband
Input value in
D0
Function
Output value
in D1
-1000 1000
-1200
D0<-1000=>D1=D0-(-1000)
-200
1200
D0>1000=>D1=D0-1000
200
500
-1000≦D0≦1000=>D0=0
0