Rockwell Automation 1771-OD AC (120V) Isolated Output Module Installation Instructions - Manual (Page 9)

AC (120V) Isolated Output Module 9
Publication 1771-IN078A-EN-P - October 2002
You can use an output of the 1771–OD module to drive an input of a
120V AC input module (1771–IA, –IA2, –ID and –IAD) to indicate
status, such as the turning on of a motor starter (Figure 2). Both
modules must be powered by the same ac source. In addition, you
must add an external resistor (or an electronic snubber, pt. no.
RG–1676–1) between the output terminal and the common (L2)
(Figure 2). Typically, this is a 2.5K ohm, 10W resistor.
ATTENTION
!
Do not connect the 1771-OD output channels in
series. Doing so can result in distortion of the output
waveform causing the output devices to chatter.
Figure 2
Using an Output Module to drive an Input Module
L1
2.5K ohm
10 Watt
Resistor
A
O
1
2
3
4
5
6
7
B
L2
AC (120V) Isolated Output Module
1771-IA
AC (120V) Input Module
1771-OD
2.5K ohm
10 Watt
Resistor
L1 L2
AC (120V) Isolated Output Module
1771-OD
AC/DC (120V) Input Module
1771-IAD
11885-I
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
120V ac
Supply
120V ac
Supply
Input 00
Input 01
Input 02
Input 03
Input 04
Input 05
Input 06
Input 07
Input 10
Input 11
Input 12
Input 13
Input 14
Input 15
Input 16
Input 17