Rockwell Automation 1395 Discrete Adapter, Rev 3.XX-8.XX - Manual (Page 31)

Chapter 5
StartĆUp
5-8
As shown in Figure 5.5, another 0 to 10V DC meter is connected to
Digital-To-Analog (D/A) output number 2. In this example, Parameter 452
which feeds the D/A is linked to drive Parameter 112, Armature Current
Feedback. In this example we assume that armature Current Feedback will
vary between 0% and 200% rated current. This means the drive digital
signal will vary between 0 and 8192 and the D/A signal must vary between
0 and 2048 for a 0 to 10V DC output. In this case, programming Parameter
577 to a value of 0.25 will provide the correct scaling
(0.25 x 8192 = 2048). Setup Parameter 578 can remain at zero volts offset
because a DC offset is not required in this example (Refer to Figure 5.5).
Figure 5.5
Example 2: Analog Output
0 to 200% Current Indication
Scale
A
D
0
4096 = 100%
or 1 per unit
Example 2:
0.25
0 100% 200%
0V 10V
Offset
0
+8192
0
+2048
0
+2048
0
-2048
Analog Range
Digital Range
0 to 200%I
A
0
to 8192
+10V = 200% I
AFDBK
0V = 0% I
AFDBK
0 -10V +10V
Drive Units
O to 200% IA
After Scaling
After Offset
Meter Voltage
% I
AFDBK
+5V
0
0
0
0
0
+1024
+4096
+1024
+1024
+5V
100%
+2048
+8192
+2048
+2048
+10V
200%