[etherlab-users] Problem with EL9830 -> 16in/16out

Florian Pose fp at igh-essen.com
Mon Oct 19 12:15:02 CEST 2009

Hi Paolo,

On Tue, Oct 13, 2009 at 05:13:28PM +0200, Inselmini Paolo wrote:
> I have some problem with the EL9830 beckhoff evaluation board in the
> 16bit in 16bit out configuration.  In this configuration mode there
> are 3 SM (2 for output, 1 for input) but only 2 FMMUs must be used
> (see xml).  I'm using the Generic Slave with simulink.
> The resulting error is: [ 2072.504450] EtherCAT ERROR: Slave 0 has
> less FMMUs (2) than requested (3). (see attached syslog)
> The EtherCAT master configure 1 FMMU each SM, how can I combine 2 SM
> in a single FMMU?

This is only possible, if the sync managers are directly besides each other in
memory. A fine solution for this would be to tell the master to check,
if an existing FMMU could be extended before reserving a new one. This
is currently not implemented. But feel free to do so! ;-)

Best regards,
Florian Pose


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