Omron CJ Series Operation Manual page 11

Introduction
Precaution on Terminology
In this manual, "download" refers to transferring data from the Sysmac Studio to the physical Controller
and "upload" refers to transferring data from the physical Controller to the Sysmac Studio.
In this manual, the CJ1W-PRM21 Unit may be referred to as "PROFIBUS Master Unit", "Master Unit",
or "PRM21 Unit". Also, the CJ1W-PRT21 Unit may be referred to as "PROFIBUS Slave Unit", "Slave
Unit", or "PRT21 Unit".
CJ-series PROFIBUS Master Unit Operation Manual for NJ-series CPU Unit (W509) 9