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Configuring Hardware and Communication Connections STEP 7.pdf

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5.9 Media Redundancy<br />

5.9.1 What You Should Know a About Media Redundancy<br />

<strong>Configuring</strong> IRT <strong>Communication</strong><br />

Media redundant transmission means that the data in IRT communication are<br />

transmitted in two frames over two separate paths. A frame is the unit in which data<br />

are transmitted over the Ethernet.<br />

The "media-redundant transmission" property can the configured as follows:<br />

• For an entire IO device<br />

• For each individual address area in a controller-controller communication<br />

relationship (direct data exchange)<br />

Media Redundancy for an Entire IO Device<br />

All data in the communication relationship between the IO controller <strong>and</strong> the IO<br />

device are transmitted in a media-redundant manner.<br />

Media Redundancy for an Individual Address Area in a Controller-Controller<br />

<strong>Communication</strong> Relationship (Direct Data Exchange)<br />

Media-redundant transmission is configured for each address area between sender<br />

<strong>and</strong> receiver. This means that, in each case, this corresponds to one row in the<br />

"Sender/Receiver" tab in the property sheet for an IO controller interface.<br />

<strong>Configuring</strong> <strong>Hardware</strong> <strong>and</strong> <strong>Communication</strong> <strong>Connections</strong> with <strong>STEP</strong> 7<br />

A5E00706939-01 5-9

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