IDEC MICROSmart FC6A Series Ladder Programming Manual page 549

Example 1: When the dead band is enabled
When the dead band (S2+6, S2+7) is 100 and initial value of the output value (dead band) (D1+2, D1+3) is 0, the operation
in regard to the output value (D1+0, D1+1) is as follows.
Output Value
Cycle
(D1+0, D1+1)
1st scan 10
2nd scan 50
3rd scan 100
4th scan 50
5th scan 0
6th scan -50
7th scan -100
Output value (dead band) change notification
Dead band (S2+6, S2+7)
=100
Output value (dead band)
(1) Since the absolute value of the difference (D1+4, D1+5) between the output value and the output value (dead band) is
less than the dead band, the output value (D1+0, D1+1) is not stored in the output value (dead band) (D1+2, D1+3).
(2) Since the absolute value of the difference (D1+4, D1+5) between the output value and the output value (dead band) is greater
than or equal to the dead band, the output value (D1+0, D1+1) is stored in the output value (dead band) (D1+2, D1+3).
(3) Output value (dead band) change notification (D2+0) turns on for one scan when (2) occurs.
Output Value (dead
band)
(D1+2, D1+3)
0
0
100
100
0
0
-100
1st scan
ON
(D2+0)
OFF
100
50
Output value 10
(D1+0, D1+1)
-50
-100
100
(D1+2, D1+3)
Initial value 0
(1)
-100
FC6A S MICROS L
ERIES MART
27: F
Absolute Value of the Difference
between the Output Value and the
Output Value (dead band) (D1+4, D1+5)
10
50
100
50
100
50
100
2nd scan 3rd scan 4th scan
(3)
(2)
(1) (1)
P M
ADDER ROGRAMMING ANUAL
C
LOW ALCULATION
Output Value (dead band)
Change Notification
(D2+0)
OFF
OFF
ON
OFF
ON
OFF
ON
5th scan 6th scan 7th scan
(3) (3)
(2) (2)
(1)
FC9Y-B1726
I
NSTRUCTIONS
27-3