User`s manual

02/2005 7
1
Introduction to the LUFP7
Gateway
Introduction to the LUFP7 Gateway
Overview The LUFP7 gateway allows a master located on a Profibus-DP network to
communicate with slaves on a Modbus RTU network. This is a generic protocol
converter operating in a way which is transparent to the user.
This gateway allows the user to interface many products marketed by Schneider
Electric with a Profibus-DP network. These include TeSys U motor starters, Altivar
driver and the XPS-MC Safety Controllers.
This document concerns the communication between a Premium CPU and an
XPS-MC Safety Controller. The present documentation only briefly describes the
setup for communication between a Profibus Master DP and an XPS-MC Modbus
slave. For further information about the gateway refer to the "LUFP7 Telemecanique
Gateway Profibus-DP / Modbus RTU User’s manual".
Terminology The term "RTU", refers to the Modbus RTU communication protocol and can be
omitted. As a result, the term "Modbus" will refer to the Modbus RTU communication
protocol.
As is still the case with all communication systems, the terms "input" and "output"
are somewhat ambiguous. To avoid any confusion, we use a single convention
throughout this document. So the notions of "input" and "output" are always as seen
from the PLC, or the Profibus-DP master.
Hence, an "output" is a command signal sent to a Modbus slave, whereas an "input"
is a monitoring signal generated the same Modbus slave.
Because we are only concerned with the XPS-MC signals in this document, we have
only "inputs" from the Modbus slave.