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12
1. Introduction
Ö Each LUFP7 gateway is shipped pre-configured so as to make it easier to operate and the factory settings
can be used as a basis for a configuration which will best meet the user’s expectations. The typical
operations applicable to this default configuration are described in chapter 6 Configuring the Gateway,
page 44.
The Profibus-DP network is totally separate from the Modbus network. The frames on a network are not directly
“translated” by the gateway to generate frames on the other network. Instead, the exchanges between the content
of the gateway’s memory and the Modbus slaves make up a system which is independent of the one which is
entrusted with managing the exchanges between this same memory and the Profibus-DP master.
So the user must ensure that the size of the Profibus-DP data corresponds to the size of the memory used for
the Modbus exchanges, because the gateway configures its Profibus-DP exchanges on the basis of the memory
used by the Modbus frames.
The two synopses which follow illustrate the independent management of each of the two networks:
— Managing Gateway
↔
Modbus slaves exchanges —
Slave
A
Command A1
Quer
y
A1RQ
• • • Data
(
Out
)
• • •
Frame
→
Response A1AQ
• • • Data
(
In
)
• • •
Trame
→
Slave B
Command B1
Quer
y
B1RQ
• • • Data
(
Out
)
• • •
Trame →
Response B1AQ
• • • Data
(
In
)
• • •
Frame
→
–
–
–
–
–
–
–
–
ABC Configurator
Configuration of
Modbus exchanges
by the user
LUFP7 gateway
0x0000
0x00F3
:
Input
memory
:
0x0200
0x02F3
:
Output
memory
:
:
Managing
exchanges with the
Modbus slaves
Slave A Slave B
Modbus Network
Transfer of the configuration