Table of Contents
Advertisement
V
OUTS
Opto
Digital
Isolation
Output
Isolated Analog
Output Common
Note: Schematic does not show overvoltage protection circuits.
Voltage Outputs - 1791 N4V2 and 1791 NDV
A simplified schematic of a +10V output channel is shown below.
Precision
Operational
Amplifier
DAC
+
-
2
Isolated Analog
2
Output Common
The +10V output provides 14 bits of resolution and is capable of driving
loads as small as 1k ohm. The output sacrifices a small amount of the
resolution to provide a margin of 2.5% to allow for system or calibration
inaccuracies as shown below.
Resolution
10.25
10
Output Signal
Scaling
The digital data sent to the output is always scaled by the values set in the
maximum (S
) and minimum (S
max
scaling method. When digital data sent equals S
+10.000V and the digital data sent equals S
–10.000V. The following equations shows this relationship:
Vout = M x Module Data + B
where:
M =
(Smax – Smin)
10 x (Smax + Smin)
B =
Chapter 1
Introducing Block I/O
2
Isolated Analog
2
Output Common
14 Bits
13.96 Bits
0
Nominal Range
) scaler values using a two point
min
max
, the output produces
min
20V
(Smax – Smin)
V
OUT
V
RET
12501-I
-10 -10.25
, the output produces
1-9
Advertisement
Table of Contents
