Rockwell Automation 2080-LC20-20QBBR Micro820 20-point Programmable Controllers User Manual - Manual (Page 35)

Rockwell Automation Publication 2080-UM005A-EN-E - December 2013 27
Wire Your Controller Chapter 4
The following diagram shows an output with a suppression device. We
recommend that you locate the suppression device as close as possible to the load
device.
If the outputs are DC, we recommend that you use an 1N4004 diode for surge
suppression, as shown below. For inductive DC load devices, a diode is suitable. A
1N4004 diode is acceptable for most applications. A surge suppressor can also be
used. See
Recommended Surge Suppressors on page 28 . As shown below, these
surge suppression circuits connect directly across the load device.
Suitable surge suppression methods for inductive AC load devices include a
varistor, an RC network, or an Allen-Bradley surge suppressor, all shown below.
These components must be appropriately rated to suppress the switching
+DC or L1
Suppression
device
DC COM or L2
AC or DC
outputs
Load
VAC/DC
Out 0
Out 1
Out 2
Out 3
Out 4
Out 5
Out 6
COM
+24V DC
IN4004 diode
Relay or solid
state DC outputs
24V DC common
VAC/DC
Out 0
Out 1
Out 2
Out 3
Out 4
Out 5
Out 6
COM
A surge suppressor
can also be used.