how to define cyclic load using abaqus

hello everybody:

i am trying to do a project on load controlled cyclic test. By using the Sin wave, i want to define the load.

If i want to define the load range to be 100 to 1000 how can i define the amplitude?

Also, as come to the platic deformation, do i need to give any criterion or anything particular?

thanks

anyone has some idear can you send to xiaojiao_yu@brown.edu?