Rockwell Automation 1762-Lxxxx MicroLogix 1200 Programmable Controllers - Manual (Page 37)

Publication 1762-UM001G-EN-P - March 2011
Wire Your Controller 3-3
Wire with Spade Lugs
The diameter of the terminal screw head is 5.5 mm (0.220 in.). The input and
output terminals of the MicroLogix 1200 controller are designed for a 6.35
mm (0.25 in.) wide spade (standard for #6 screw for up to 14 AWG) or a 4
mm (metric #4) fork terminal.
When using spade lugs, use a small, flat-blade screwdriver to pry the
finger-safe cover from the terminal blocks as shown below. Then loosen the
terminal screw.
Use Surge Suppressors Because of the potentially high current surges that occur when switching
inductive load devices, such as motor starters and solenoids, the use of some
type of surge suppression to protect and extend the operating life of the
controllers output contacts is required. Switching inductive loads without
surge suppression can significantly reduce the life expectancy of relay contacts.
By adding a suppression device directly across the coil of an inductive device,
you prolong the life of the output or relay contacts. You also reduce the effects
of voltage transients and electrical noise from radiating into adjacent systems.