Rockwell Automation 1760-xxxx Pico Controller User Manual - Manual (Page 37)

Publication 1760-UM001D-EN-P - September 2005
Installation 2-13
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 the table on page 2-14 for recommended suppressors.
As shown in the illustration below, these surge suppression circuits
connect directly across the load device.
Surge Suppression for Inductive ac Load Devices
Output Device Output Device Output Device
Varistor RC Network Surge
Suppressor
Surge Suppression for Inductive dc Load Devices
Output Device
Diode
_ +
(A surge suppressor can also be used.)