Schneider Electric user manual CPU stop/failure LUFP7 gateway Profibus-DP Modbus RTU

6. Configuring the Gateway

Name of the Modbus slave

Name of the Modbus command

Modbus query ! Frame "

Slave no.

Function no.

Word no. (MSB / LSB)

Value of the word (MSB / LSB)

CRC16 (LSB / MSB)

Modbus response ! 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:

Desired

behaviour

Reset

Outputs Hold

No refresh

Reset

Inputs

Hold

Event

Premium PLC:	Disconnection	Failure of the		Disconnection of
	of the upstream			the downstream
CPU stop/failure		LUFP7 gateway
	Profibus-DP			Modbus RTU
(1)		(3)
	network (2)			network (2) (3)
“Outputs” option	“Offline options for
equal to “Reset”	fieldbus” = “Clear”	Depending on the configuration
“Outputs” option	“Offline options for	of the Modbus slaves
equal to “Hold”	fieldbus” = “Freeze”
——	“Offline options for		——
	fieldbus” = “No Scanning”
——	Always			“Offline options for sub-
				network” = “Clear”
——	——			“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.

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