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6. Configuring the Gateway
Constants in Byte, Word or DWord format allow you to relieve the Profibus-DP master by placing the values of
these constants in Modbus query frames (constants in “Query” elements) or by comparing them to the values
located in the Modbus responses (constants in “Response” elements). These comparisons are used to accept
(identical values) or reject (different values) the Modbus responses in the same way as for standard Modbus
commands. The Profibus-DP master does not have access to these constants. They are mainly used to replace
fields such as “Slave address,” “Function,” “Starting Address,” etc.
Please see the section on “Actions on request/response” in chapter
2.6.4 Transaction and in chapter 2.6.6 Frame
objects in the AbcConf user manual, entitled AnyBus Communicator – User Manual for further information
about how to handle “Transaction” type commands. This manual can be found on the CD LU9CD1 :
“
ABC_User_Manual.pdf”.
The LUFP7 gateway’s default configuration includes two “Transaction” commands. These are aperiodic
commands used for reading and writing the value of a Modbus slave parameter (necessarily a TeSys U motor
starter with the default configuration). They are configured solely for the “TeSys U n°1” node, as the address of
the slave is controlled by the Profibus-DP master via the first byte of the “Data” field, which corresponds to the
“Slave Address” field in standard Modbus commands. This allows the Profibus-DP master to send this command
to all of the Modbus slaves, slave by slave, through the first byte of the “Data” field. The remaining fields of the
frames used by these two commands are also placed in the same “Data” field. So the Profibus-DP master has
access to all of the content of the frames in these two commands, excluding the checksum.
6.12. Configuring the General Characteristics of the Gateway
This operation relates to the gateway’s general characteristics (“Fieldbus”
to “Sub-Network” elements), whereas the previous chapters described the
configuration of the Modbus slaves (elements located under the “Sub-
Network” element).
The “Fieldbus” element describes the upstream network, that is to say the
Profibus-DP network in the case of the LUFP7 gateway.
The “ABC” and “Sub-Network” elements describe the downstream
network, that is to say the Modbus RTU network in the case of the LUFP7
gateway, and allow you to identify the software version in the gateway.
The configuration of these three elements, plus the commands they give
access to, are described in the next three chapters.
6.12.1. “Fieldbus” Element
Below this element there is a list of the mailboxes configured by default. These elements are not described here,
as they are only designed for the internal management of the gateway. These mailboxes can neither be changed
nor deleted. Both their number and their nature depend on the type of upstream network.
When the “Fieldbus” element is selected, you can select the
type of upstream network. With the LUFP7 gateway, you
must select the “Profibus-DP” network.
If your PC is connected to the gateway using the PowerSuite
cable and you are using AbcConf in “on-line” mode when
AbcConf starts up, the type of upstream network will be
automatically detected.