Schneider Electric LUFP9 user manual DeviceNet

6. Configuring the Gateway

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 DeviceNet application. In this case, this application includes an LUFP9 gateway, but we will not be including either the master PLC or its scanner:

Desired behaviour

Reset

Outputs Hold

Stop refresh

Reset

Inputs

Hold

Event

DeviceNet PLC:	Disconnection of the	Failure of the		Disconnection
				of the downstream
	upstream DeviceNet	LUFP9 gateway
CPU stop or failure				Modbus RTU
	network (1)	(2)
				network (1) (2)
Depending on the	“Offline options for
configuration	fieldbus” = “Clear”	Depending on the configuration
of the DeviceNet	“Offline options for	of the Modbus slaves
master	fieldbus” = “Freeze”
——	“Offline options for		——
	fieldbus” = “No Scanning”
——				“Offline options for sub-
	Depending on the configuration			network” = “Clear”
——	of the DeviceNet master			“Offline options for sub-
				network” = “Freeze”

(1)The “Offline options for fieldbus” and “Offline options for sub-network” are described in the next chapter.

(2)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 can also read the user manuals for your master and your DeviceNet scanner to obtain further details about how to process degraded modes.

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