[etherlab-users] Invalid output configuration

[Gavin Lambert]

Typically, yes.

What you should try is this:

 1.  Ensure that your master app is not running.
 2.  Physically reboot the slave (eg. power cycle).
 3.  Run “ethercat cstruct -p0” (substitute the position of your actual slave if different)
 4.  Compare the output to the code in your master app.

This will tell you the default PDO layout of the slave, which is typically what you want to use in your master app – unless you can prove otherwise, assume anything different in your code is a bug.

In some cases you may want to use some non-default PDOs, and there are ways to get the cstruct output for that as well, but typically slaves will only support a limited set of alternative configurations.


Gavin Lambert
Senior Software Developer

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From: William Zumwalt
Sent: Thursday, 4 June 2020 12:15
To: etherlab-users at etherlab.org
Subject: [etherlab-users] Invalid output configuration

I getting "Invalid output configuration" when starting up a slave. Can anyone help narrow this down, to what this might refer to?

[ 4101.757740] EtherCAT DEBUG 0-main-0: PREOP -> PREOP + ERROR.
[ 4101.757751] EtherCAT ERROR 0-main-0: Failed to set SAFEOP state, slave refused state change (PREOP + ERROR).
[ 4101.765760] EtherCAT 0: Slave states on main device: PREOP + ERROR.
[ 4101.765769] EtherCAT ERROR 0-main-0: AL status message 0x001D: "Invalid output configuration".

Could this be configuration issue with the sync EC_DIR_OUTPUT?

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