It also returns an error if something does not byte-align and you provide NULL for the bit_position argument. So you shouldn't see any overlapping offsets as a result of this unless you're throwing away data.
From: etherlab-users-boun...@etherlab.org [mailto:etherlab-users-boun...@etherlab.org] On Behalf Of Dave Page Sent: Thursday, 10 April 2014 10:07 To: Steve Hartmann; etherlab-users@etherlab.org Subject: Re: [etherlab-users] Domain offset overlap Hi, Sorry, I misinterpreted your message. ecrt_slave_config_reg_pdo_entry can produce apparently overlapping offsets when the PDO data is not on even bit boundaries (not divisible by 8). You may wish to use the unsigned int *bit_position argument to discover the bit offsets of your data. Best regards - Dave On 09-Apr-14 15:49, Steve Hartmann wrote: Hi Dave, Thanks for the reply. I am not using TwinCAT at all. Also, please forgive my ignorance, but what is the "LRW command". I'm not sure how to deal with this with the etherlab stack. If it give me a domain offset of 3 for two different slices (one input and one output), how do I deal with this overlapped data? Thanks, Steven From: Dave Page <dave.p...@gleeble.com> Date: Wednesday, April 9, 2014 2:45 PM To: Etherlab Users <etherlab-users@etherlab.org> Subject: Re: [etherlab-users] Domain offset overlap In order to reduce process data size, TwinCAT overlaps the RxPDO and TxPDO for each module, then uses the LRW command to effect the transfer. So, I believe what you're seeing is normal. Best regards - Dave Page On 09-Apr-14 15:41, etherlab-users-requ...@etherlab.org wrote: Message: 1 Date: Wed, 9 Apr 2014 19:41:29 +0000 From: Steve Hartmann <mailto:shartm...@militho.com> <shartm...@militho.com> To: Etherlab Users <mailto:etherlab-users@etherlab.org> <etherlab-users@etherlab.org> Subject: [etherlab-users] Domain offset overlap Message-ID: <mailto:cf6b0c97.f827%25shartm...@militho.com> <cf6b0c97.f827%shartm...@militho.com> Content-Type: text/plain; charset="us-ascii" Hi all, I have written some code to parse the generated XML file from "ethercat xml" and use that to configure the ethercat stack. The problem I am having is the output from ecrt_slave_config_ret_pdo_entry produces overlapped offsets. I also tried using ecrt_slave_config_reg_pdo_entry_pos with the same results. This is a very simple test rig that has one each of DO, DI, AO, and AI slices - all beckhoff. I have attached a file which includes the generated XML file, the code in question, and the log output. Does anyone know what I am doing wrong? Best regards, Steven Hartmann -- _____ David Page, Chief Embedded Architect Dynamic Systems Inc. PO Box 1234 Poestenkill, NY 12140 Telephone: +1 (518) 283-5350 | Fax: +1 (518) 283-3160 | -- _____ David Page, Chief Embedded Architect Dynamic Systems Inc. PO Box 1234 Poestenkill, NY 12140 Telephone: +1 (518) 283-5350 | Fax: +1 (518) 283-3160 |
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