Table of Contents
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Chapter 1
Introducing Block I/O
I
OUTS
Opto
Digital
Isolation
Output
Isolated Analog
Output Common
Note: Schematic does not show overvoltage protection circuits.
1-10
You can choose one of three scaling methods:
binary counts
default scaling
user scaling
User scaling is not available when you select discrete transfer mode.
The following table shows the output signals produced by various module
data values entered in each of the three scaling methods. In the user scaling
column, S
was set to 5000 and S
max
Output Signal
Binary Counts
Approx. +10.25V
8395
+10V
8191
0.000V
0000
-10.00V
-8192
Approx. -10.25V
-8396
Current Outputs - 1791 N4C2 and 1791 NDC
A simplified schematic of a 0 to 20mA output channel is shown below.
High Side
DAC
Current
Monitor
Isolated Analog
2
2
Output Common
The 0 to 20mA output provides 13 bits of resolution and is capable of
driving loads as large as 1k ohm.
was set to 0000.
min
Module Data
Default
Scaling
Scaling
10250
5062
10000
5000 (Smax)
00000
2500
-10000
0000 (Smin)
-10250
-0062
+15V
-15V
User
Scaling
I
OUT
I
RET
12505-I
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