DL06 Micro PLC User Manual, 3rd Edition, Rev. E
Chapter 2: Installation, Wiring, and Specifications
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Many AutomationDirect socketed relays and motor starters have add-on flyback diodes
that plug or screw into the base, such as the AD-ASMD-250 protection diode module and
784-4C-SKT-1 socket module shown below. If an add-on flyback diode is not available for
your inductive load, an easy way to add one is to use AutomationDirect’s DN-D10DR-A
diode terminal block, a 600 VDC power diode mounted in a slim DIN rail housing.
DN-D10DR-A
Diode Terminal Block
AD-ASMD-250
Protection Diode Module
784-4C-SKT-1
Relay Socket
ZL-TSD8-24
Transorb Module
Two more common options for DC coils are Metal Oxide Varistors (MOV) or TVS diodes.
These devices should be connected across the driver (PLC output) for best protection as shown
below. The optimum voltage rating for the suppressor is the lowest rated voltage available that
will NOT conduct at the supply voltage, while allowing a safe margin.
AutomationDirect’s ZL-TSD8-24 transorb module is a good choice for 24VDC circuits. It is
a bank of 8 uni-directional 30V TVS diodes. Since they are uni-directional, be sure to observe
the polarity during installation. MOVs or bi-directional TVS diodes would install at the same
location, but have no polarity concerns.
24 VDC
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