Rockwell Automation 2755 AdaptaScan Bar Code Readers - Manual (Page 55)

Installing the Wiring Base and Power Supply 3–20
Output Module Application
Shown below is a typical output module application. When
connecting high impedance loads, you may need to add a resistor in
parallel with the load. This resistor (typically 300 to 6,000 ohms)
provides a continuous minimum current flow (10 mA DC or 50 mA
AC) through the output module in the closed state. See Appendix C
for available Allen-Bradley fuse, diode and resistor terminal blocks.
– +
AC or DC Source
Optional Resistor
Fuse
Recommended
Load
Back Electromotive Force (EMF) is sometimes generated when an
inductive load is switched off. Back EMF may damage the output
module. A diode in parallel with the inductive device dissipates the
back EMF.
– +
DC Source
Optional Diode
Fuse
Recommended
Inductive
Load