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6. Configuring the Gateway
Name of the Modbus slave
Name of the Modbus command
Modbus quer
y
! Frame "
Slave no.
Function no.
Word no.
(
MSB / LSB
)
Value of the word
(
MSB / LSB
)
CRC16
(
LSB / MSB
)
Modbus res
p
onse ! Frame "
Slave no.
Function no.
Word no.
(
MSB / LSB
)
Value of the word
(
MSB / LSB
)
CRC16
(
LSB / MSB
)
These elements can be configured using AbcConf. There is a description of them in the following chapters. We
will then return to the example of the ATS48 to illustrate how to use these elements.
6.11.2.1. Managing degraded modes
Due to the number of hardware elements and software tools used, the following table shows a summary of the
various degraded modes in a Profibus-DP application. This description only applies to a Premium PLC fitted with
a TSX PBY 100 coupler:
Event
Desired
behaviour
Premium PLC:
CPU stop/failure
(1)
Disconnection
of the upstream
Profibus-DP
network (2)
Failure of the
LUFP7 gateway
(3)
Disconnection of
the downstream
Modbus RTU
network (2) (3)
Reset
“Outputs” option
equal to “Reset”
“Offline options for
fieldbus” = “Clear”
Hold
“Outputs” option
equal to “Hold”
“Offline options for
fieldbus” = “Freeze”
Depending on the configuration
of the Modbus slaves
Outputs
No refresh
——
“Offline options for
fieldbus” = “No Scanning”
——
Reset
—— Always
“Offline options for sub-
network” = “Clear”
Inputs
Hold
—— ——
“Offline options for sub-
network” = “Freeze”
(1) The “Outputs” option is described in chapter 4.2.8 Importing the Configuration of the Profibus-DP Network
under PL7 PRO, page 31. Under PL7 PRO, it can be accessed from the configuration screen for the
TSX PBY 100 board.
(2) The “Offline options for fieldbus” and “Offline options for sub-network” are described in the next chapter.
(3) The behaviour desired with regard to the outputs should be directly configured on each of the Modbus
slaves. In the case of drives marketed by
Schneider Electric, for instance, resetting the outputs is
configured by setting the NTO bit to 0 (communication control), and they are held by setting NTO to 1
(suppression of communication control).
You may also refer to chapter 4.2 Degraded application mode of the
Implementation manual – TSX PBY 100 –
PROFIBUS-DP
(ref.: TSX DM PBY 100E) for further details regarding the processing of degraded modes by the
TSX PBY 100 board.