Contact - Allen-Bradley Micro800 General Instructions Manual

Chapter 3 Ladder Diagram (LD) elements
44
Reset Coil
Reset coils support a Boolean output of a connection line Boolean state.
The associated variable is reset to FALSE when the Boolean state of the left
connection becomes TRUE. The output variable keeps this value until an inverse
order is made by a Set coil. The state of the left connection is propagated into the
right connection. The right connection must be connected to the right vertical
power rail (unless you have parallel coils, where only the upper coil must be
connected to the right vertical power rail).
The associated Boolean variable must be output or user-defined.
Example: Reset Coil

Contact

Contacts are graphic components of an LD diagram. Depending on the type, a
contact represents the value or function of an input or of an internal variable.
Contacts can only be added to a defined rung in the LD language editor. After a
contact is added, its definition can be modified.
Example: Contacts
Rockwell Automation Publication 2080-RM001D-EN-E - February 2015