Rockwell-automation AADvance Controller Configuration Guide Manual de usuario descargar pdf (Pagina 209)

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Document: 553633

ICSTT-RM405f-EN-P

Issue 07

9-23

Choosing Names for Modbus Objects

The Modbus object Name identifies a Modbus master object or slave link within the

AADvance Workbench, and is included in printed reports; but it is not used by the

application. We recommend that you use a different name for each object.

Alternatively, accept the default name.

Modbus Master Timeout

The Modbus master Timeout is common to all slaves configured to a particular

master. It specifies the period of time the Modbus master will wait for a response from

its slave device(s) before retrying or assuming that the slave is unavailable. The Modbus

master uses the timeout for each of its configured slaves to determine whether they

are still communicating. If a slave does not respond within this period (and a specific

number of retries), it will be deemed to have failed.

Note: You configure the number of retries independently for each slave.

Message Wait Interval

The Message Wait Interval enables the Modbus master to support legacy Modbus

slave devices, with slow communications responses, attached to multi-drop serial links.

It is used only for serial Modbus communications using Modbus RTU.

The interval provides time for a legacy slave device to establish that a response from

another slave to an earlier request from the Modbus master is not a new request

targeted to the legacy slave. The illustration shows a multi-drop link from the Modbus

master to two slave devices, with the request message to slave 2 delayed by the

message wait interval.

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Rockwell-automation AADvance Controller Configuration Guide Manual de usuario Pagina 209