Normally Profibus-DP does not support master to master exchanges.
The easiest way around this limitation, if you can limit the data size
of the exchanges to 240 bytes IN/240 bytes OUT is to use a DP/DP
coupler (6ES7 158-0AD01-0XA0).
This is a special slave with 2 DP interfaces, one connected to each
master's DP network, and configured as a slave in each DP master's
configuration. Data written to one side by Master1 can be read by
Master2, and whatever is written by Master2 can be read by Master1.
A manual for this unit (dpdpk_e.pdf) can be found on Siemens' website.
There are other solutions, if
this one cannot be used; one possibilty is a FDL Send/Recieve
interface, which requires no further hardware but needs detailed
configuration and programming.
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