[etherlab-users] EtherCAT :: Problems with EL4732 and EL3702 distribuited clock

[Bilko AS, Oguz Dilmac]

Hi,

Did you try using ecrt_master_sync_slave_clocks(master) function after 
ecrt_master_sync_reference_clock(master)?

Best regards,
Oguz.

23.07.2012 17:13 tarihinde, Guido yazdı:
> Hello everybody,
> my name is Guido and I am evaluating the EtherLab EtherCAT-Master.
> I've just done some simple tests and everything is working properly. I 
> have instead some problems regarding Beckhoff EL4732 and EL3702 
> modules. Looking the mailing lists I was able to send an output 
> voltage value and to read it with the input module. However I have a 
> problem: when I set the output like a square wave I have periodically 
> (after about 10 seconds) a lost of synchronism, visible on the 
> oscilloscope like a flicker of the square wave . The task that I have 
> written is a simple real-time tasks (under rtai) with a periodicity of 
> 1 ms (which I have checked).
> I made the setting of the Distributed clock (without oversampling) ​​ 
> with the instructions:
>
> ecrt_slave_config_dc(sc_ana_out, 0x0730, 1000000, 0, 0, 0); //1ms 
> (EL4732)
> ecrt_slave_config_dc(sc_ana_in, 0x0730, 1000000, 0, 0, 0); //1ms (EL3702)
>
> while in the cycle run:
>
> while(1) {
> ecrt_master_receive(master);
> ecrt_domain_process(domain1);
>
> blink=!blink;
>
> if(blink) ch1_volt=0x3FFF;
> else ch1_volt=0;
>
> EC_WRITE_S16(domain1_pd+off_el4732_ch1, ch1_volt);
> EC_WRITE_S16(domain1_pd+off_el4732_cc1, 0)
>
> tv.tv_usec +=1000;
> if (tv.tv_usec>=1000000) {
> tv.tv_usec -=1000000;
> tv.tv_sec++;
> }
> ecrt_master_application_time(master, EC_TIMEVAL2NANO(tv));
> ecrt_master_sync_reference_clock(master)
>
> ecrt_domain_queue(domain1);
> ecrt_master_send(master);
>
> rt_task_wait_period();
> }
>
> Does anyone tell me where is the problem?
> I also tried to follow the same steps with the SOEM master, setting 
> the Distribuited Clock with the ec_dcsync01 and the ec_configdc() 
> func. but in this case I can not see the output voltage on the module.
>
> Can anyone help me to solve these problems?
> Thank you so much.
> Guido
> _______________________________________________
> etherlab-users mailing list
> etherlab-users at etherlab.org
> http://lists.etherlab.org/mailman/listinfo/etherlab-users

-- 
Oguz Dilmac
ARGE Bolumu

Bilko AS, R&D Department
====================================
Perpa Ticaret Merkezi B Blok Kat 13 Nr. 2568
TR-34384 Okmeydani Istanbul Turkey
Tel : +90 212 220 07 40  Fax :   +90 212 210 47 01
e-mail : odilmac at bilko-automation.com
web site : http://www.bilko-automation.com