Asyncronous Event Based Data Access.

[Bit2Bi]

Hello,
I am wondering if there is a suitable method to read data from slave on an event based pattern. In case of the native SOEM code what memory address or variable should be listened to?
Actually, I am reading the data from slave in a continous loop like:
`
do {
for (i = 0; i < oloop; i++) outData += *(ec_slave[0].outputs + i );

for (i = 0; i < iloop; i++) inData += *(ec_slave[0].inputs + i );
} while(true);
`
Helpful hints are much appreciated.

[Apollo3zehn]

If you want to know if a slave variable has changed, there is no built-in method to monitor changes. Data from all the slaves is collected in a single round-trip EtherCAT frame and simply copied to the IOMap array to which the .inputs and .outputs variables are pointing to.

If know which variable you want to monitor you could compare the IOMap (or that part which holds the data of your variable to monitor) to the old IOMap right after the UpdateIO method is called (in case of EtherCAT.NET it would be here: https://github.com/Apollo3zehn/EtherCAT.NET/blob/master/sample/SampleMaster/Program.cs#L120)