1 Features and System Configuration
1-2
CJ-series PROFIBUS Master Unit Operation Manual for NJ-series CPU Unit (W509)
1-1 Overview of PROFIBUS
Standard EN50170
PROFIBUS (PROcess FIeldBUS) is an open fieldbus standard for a wide range of applications in
manufacturing, processing and building automation. The Standard, EN 50170 (the Euronorm for
field communications), to which PROFIBUS adheres, guarantees vendor independence and trans-
parency of operation. It enables devices of various manufacturers to intercommunicate without hav-
ing to make any special interface adaptations.
The PROFIBUS family comprises three mutually compatible versions: PROFIBUS FMS, PROFIBUS
DP and PROFIBUS PA.
PROFIBUS FMS
FMS means Fieldbus Message Specification. This version is the general-purpose solution for high-
level extensive and complex communication tasks. Powerful services open up a wide range of appli-
cations and provide great flexibility.
PROFIBUS DP
DP means Decentralized Periphery. PROFIBUS DP is optimized for high speed and low-cost inter-
facing. It is specially designed for communication between automation control systems and distrib-
uted I/O at the device level.
PROFIBUS PA
PA means Process Automation. It permits sensors and actuators to be connected to one common
bus even in areas where intrinsically safe products are required. It also permits data and power to be
supplied over the bus using 2-wire technology according the international standard IEC 1158-2.
Uniform Bus Access Protocol
PROFIBUS DP and PROFIBUS FMS use the same transmission technology and uniform bus
access protocol. Consequently, both versions can be operated simultaneously on the same bus.
FMS field devices, however, cannot be controlled by DP masters and vice versa.
Confirm safety at the destination node before transferring a program to another node or chang-
ing contents of the I/O memory area. Doing either of these without confirming safety may result
in injury.
1-1-1 Introduction
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