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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Hi,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Get rid of the EL9010 terminator and use an
EL9011 instead. The EL9011 is cheaper and as far as I can tell the EL9010
is no longer listed.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>In the meantime, just leave it off. The
EtherCAT terminals do not require a terminator. The EL9011 is just a
cover to provide protection for the exposed connectors.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>The EL9010 opens the port of the terminal
it is connected to, but it is not actually a slave. When the master is
trying to calculate the topology it iterates through the slaves looking for
open ports and assumes that if a port is open there is a slave connected to it.
Because there is no slave to communicate with when one is expected then the
iteration fails and the error is raised.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Important, if the topology can not be
calculated then calculating the propagation delays may also fail. Valid propagation
delays are required for distributed clocks to be correct.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Regards,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Graeme.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span lang=EN-US
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span lang=EN-US style='font-size:10.0pt;font-family:Tahoma'>
etherlab-users-bounces@etherlab.org
[mailto:etherlab-users-bounces@etherlab.org] <b><span style='font-weight:bold'>On
Behalf Of </span></b>Steven Hartmann<br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, 22 March 2012
10:08<br>
<b><span style='font-weight:bold'>To:</span></b> etherlab-users@etherlab.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> [etherlab-users] Failed
to calculate bus topology</span></font><span lang=EN-US><o:p></o:p></span></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt;
font-family:Calibri'>Hi all,<br>
<br>
I’m just getting started with the etherlab master stack, and really
ethercat in general, so please excuse my ignorance. So far I have read
the documentation I have found (ethercat-1.5-***.pdf) as well was the readme
and install files, then I followed the directions to get the driver installed.
I also cobbled together some beckhoff ethercat modules including an
EK1101, 3 EL2024s, and an EL2612 as well as an EL9010 terminator. I got
everything startup up and an able to use the command line tool to do a few
queries to find that it sees all the slices properly and can change the
operational state. One thing is bothering me so far: when I first
plug in the ethercat modules I get the following output in dmesg:<br>
<br>
EtherCAT 0: Link state changed to UP.<br>
EtherCAT 0: 6 slave(s) responding.<br>
EtherCAT 0: Slave states: INIT.<br>
EtherCAT 0: Scanning bus.<br>
EtherCAT 0: Bus scanning completed in 440 ms.<br>
EtherCAT ERROR 0: Failed to calculate bus topology.<br>
EtherCAT 0: Slave states: PREOP.<br>
<br>
I don’t understand what the “Failed to calculate but
topology” message means, nor what I need to do to avoid it. Any
help would be appreciated.<br>
<br>
Thanks,<br>
<br>
Steve</span></font><o:p></o:p></p>
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