Communications - Profibus

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Thread Starter

Mark Riche

I have a Profibus network where I have two Masters polling the same Slave data set. Is this acceptable or can this cause problems ?

Regards,
Mark Riche
 
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Daniel Chartier

hello mark;

Basically, no. 2 Profibus masters can read values from any slave configured on the network. we do this on a regular basis for monitoring purposes. But only one master will have the right to write (send commands) to any slave. Only one master can own the slave's outputs.

Hope this helps,
Daniel Chartier
 
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Dobrowolski, Jacek

As far as I remember Profibus allows only one Master to poll "common" Slaves (and this one is "real" Master for these Slaves). The other listens only (this also means that it can "read" only). So when the polling Master is down the other cannot listen anymore.

Regards,

Jacek Dobrowolski
 
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