Allen-Bradley Micro800 General Instructions Manual page 43

Chapter 3
Ladder Diagram (LD) elements
The associated variable is set to TRUE when the Boolean state of the left
connection rises from FALSE to TRUE. The output variable resets to FALSE in
all other cases. 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: Pulse Rising Edge Coil
Set Coil
Set coils support a Boolean output of a connection line Boolean state.
The associated variable is set to TRUE when the Boolean state of the left
connection becomes TRUE. The output variable keeps this value until an inverse
order is made by a Reset 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 it must be user-defined.
Example: Set Coil
Rockwell Automation Publication 2080-RM001D-EN-E - February 2015 43