Rockwell-automation AADvance Controller Configuration Guide Manuel d'utilisateur télécharger pdf (Page 188)

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ICSTT-RM405f-EN-P

Issue 07

Configuration Guide (AADvance Controller)

Modbus Master

The AADvance controller can be used as a Modbus master to one or more Modbus

slave devices. Slave devices can include programmable logic controllers, remote devices

(typically with little or no processing capability) and, more rarely, other functional

safety controllers (Trusted or AADvance).

The controller supports the Modbus RTU and Modbus TCP protocols, and a subset

of Modbus commands. You can use Modbus RTU with point-to-point and multi-drop

serial links, and Modbus TCP with Ethernet.

Note: The AADvance controller does not support the Modbus ASCII protocol.

You can set up an individual list of messages (commands) for each slave device.

Modbus read commands cause data to read from the slave device to the Modbus

master, while Modbus write commands cause data to be copied from the Modbus

master to the slave device. You can also define a sequence of broadcast write

commands, which a Modbus master can send to multiple Modbus RTU slaves without

requiring an acknowledgement. The AADvance controller can control and monitor

individual Modbus master objects and their slave links.

The Modbus master functionality has a safety integrity level of zero (SIL0) and should

only be used for non-safety applications.

Modbus Standards

The Modbus functionality implemented by the AADvance controller meets the

following standard:

 Modbus Application Protocol Specification, version 1.1b. December 2006. The

Modbus Organisation.

Modbus Master Hardware and Physical Connections

The Modbus master functionality is built into the T9110 Processor Module; the

physical communication ports are located on the T9100 Processor Base Unit. You do

not need to add any extra hardware to the AADvance controller except to make the

physical connections to the processor base unit. The illustration shows some possible

arrangements of Modbus master connections.

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Rockwell-automation AADvance Controller Configuration Guide Manuel d'utilisateur Page 188