The module of subsystem “Data acquisition” <Comedi>
| Module: | Comedi |
| Name: | DAQ boards by Comedi |
| Òèï: | DAQ |
| Èñòî÷íèê: | daq_Comedi.so |
| Âåðñèÿ: | 0.5.0 |
| Àâòîð: | Roman Savochenko |
| Îïèñàíèå: | ISA, PCI, PCMCIA, USB DAQ boards collection by Comedi ( http://www.comedi.org). |
| Ëèöåíçèÿ: | GPL |
Translation is going now
Introduction
The module provides the OpenSCADA system with the support data sources of realtime, which based on data acquisition boards (DAQ) from different manufacturers, installed on the buses: ISA, PCI, PCMCIA and USB. Drivers implementation for all supported variety boards on Linux kernel side, and also application level library, provided by project Comedi. Full supported boards list, modules to Linux kernel, by project Comedi, also and the module you can get by link: http://comedi.org/hardware.html.
Into Comedi project unified interface implemented for access to boards data on types data level, that allows, ðåàëèçîâàâ ðàáîòó ñ òèïè÷íûìè äàííûìè ïëàò òàêîãî ðîäà, íå çàáîòèòüñÿ â äàëüíåéøåì î ïîääåðæêå íîâîãî îáîðóäîâàíèÿ, íà ñòîðîíå äàííîãî ìîäóëÿ.  òåêóùåé âåðñèè äàííîãî ìîäóëÿ ðåàëèçîâàíà ïîääåðæêà òèïîâ äàííûõ: AI (ðåæèì ïðÿìîãî îïðîñà áåç FIFO), AO, DI, DO, DIO.
Ìîäóëåì ðåàëèçóþòñÿ ôóíêöèè ãîðèçîíòàëüíîãî ðåçåðâèðîâàíèÿ, à èìåííî ñîâìåñòíîé ðàáîòû ñ óäàë¸ííîé ñòàíöèåé ýòîãî-æå óðîâíÿ.
1. Îáúåêò êîíòðîëëåðà
DAQ—ïëàòû ïîñðåäñòâîì áèáëèîòåêè Comedi â OpenSCADA êîíôèãóðèðóþòñÿ ïóò¸ì ñîçäàíèÿ îáúåêòà êîíòðîëëåðà (ðèñ.1), êàê êîíòåéíåðà îáúåêòîâ ïàðàìåòðîâ — ïëàò DAQ.
Ðèñ.1. Âêëàäêà êîíôèãóðàöèè îáúåêòà êîíòðîëëåðà.
Ñ ïîìîùüþ ýòîé ôîðìû ìîæíî óñòàíîâèòü:
- Ñîñòîÿíèå êîíòðîëëåðà, à èìåííî: Ñòàòóñ, "Âêëþ÷åí", "Çàïóùåí" è èìÿ ÁÄ, ñîäåðæàùåé êîíôèãóðàöèþ.
- Èäåíòèôèêàòîð, èìÿ è îïèñàíèå êîíòðîëëåðà.
- Ñîñòîÿíèå, â êîòîðîå ïåðåâîäèòü êîíòðîëëåð ïðè çàãðóçêå: "Âêëþ÷åí" è "Çàïóùåí".
- Èìÿ òàáëèöû â ÁÄ äëÿ õðàíåíèÿ êîíôèãóðàöèè ïàðàìåòðîâ äàííîãî êîíòðîëëåðà.
- Ïîëèòèêó ïëàíèðîâàíèÿ è ïðèîðèòåò çàäà÷è îïðîñà.
Íóæíî îòìåòèòü, ÷òî îïðîñ äàííûõ â îñíîâíîì îñóùåñòâëÿåòñÿ â ñèíõðîííîì ðåæèìå, îäíàêî äëÿ íåêîòîðûõ ïëàò àíàëîãîâûõ âõîäîâ (AI-ÀÖÏ) ìîæåò áûòü áîëåå îïòèìàëüíûì àñèíõðîííûõ ðåæèì, ÷òî ñâÿçàíî ñ ïðîäîëæèòåëüíûì âðåìåíåì óñòàíîâêè çíà÷åíèÿ ïîñëå ïåðåêëþ÷åíèÿ êàíàëà ìóëüòèïëåêñîðà. Òàê, íà ïëàòå Advantech PCL-813B ýòî âðåìÿ ñîñòàâëÿåò 5ìñ.
2. Îáúåêò ïàðàìåòðû êîíòðîëëåðà
Îáúåêò ïàðàìåòðà ÿâëÿåòñÿ íåïîñðåäñòâåííûì ïðåäñòàâèòåëåì-îòðàæåíèåì DAQ-ïëàòû, êîòîðûé ñîäåðæèò íàáîð àòðèáóòîâ ñ òèïàìè è êîëè÷åñòâîì çàâèñèìûì îò êîíêðåòíî âçÿòîé ïëàòû. Âêëàäêà êîíôèãóðàöèè îáúåêòà ïàðàìåòðà ïðåäñòàâëåíà íà ðèñ.2.
Ðèñ.2. Âêëàäêà êîíôèãóðàöèè îáúåêòà ïàðàìåòðà — DAQ ïëàòû.
Ñ ïîìîùüþ ôîðìû êîíôèãóðàöèè îáúåêòà ïàðàìåòðà ìîæíî óñòàíîâèòü:
- Ñîñòîÿíèå ïàðàìåòðà, à èìåííî "Âêëþ÷åí" è òèï ïàðàìåòðà.
- Èäåíòèôèêàòîð, èìÿ è îïèñàíèå ïàðàìåòðà.
- Ñîñòîÿíèå, â êîòîðîå ïåðåâîäèòü ïàðàìåòð ïðè çàãðóçêå: "Âêëþ÷åí".
- Àäðåñ óñòðîéñòâà ïëàòû. Ñîäåðæèò ïóòü ê óñòðîéñòâó ïëàòû.  ñëó÷àå íàëè÷èÿ â ñèñòåìå êîððåêòíî çàãðóæåííûõ ìîäóëåé ÿäðà Linux äëÿ ïëàò èç êîëëåêöèè Comedi èõ àäðåñà óñòðîéñòâ áóäóò äîñòóïíû äëÿ âûáîðà.
- Àñèíõðîííîå ÷òåíèå. Âêëþ÷àåò ðåæèì ÷òåíèå äàííûõ â öèêëå çàäà÷è êîíòðîëëåðà, âìåñòî ÷òåíèÿ ïî òðåáîâàíèþ (Ñèíõðîííûé ðåæèì).
Âêëàäêà "Àòðèáóòû" äëÿ ïëàòû ACP-8113 ïðèâåäåíà íà ðèñ.3. Äëÿ äàííûõ íåêîòîðûõ òèïîâ ìîæåò áûòü äîñòóïíà âêëàäêà "Êîíôèãóðàöèÿ". Íàïðèìåð, äëÿ ïëàò àíàëîãîâûõ âõîäîâ ýòà âêëàäêà (ðèñ.4) ñîäåðæèò òàéìàóò óñòàíîâêè çíà÷åíèÿ è âûáîð äèàïàçîíà êàæäîãî êàíàëà.
Ðèñ.3. Âêëàäêà "Àòðèáóòû" îáúåêòà ïàðàìåòðà ïëàòû ACL-8113.
Ðèñ.4. Âêëàäêà "Êîíôèãóðàöèÿ" îáúåêòà ïàðàìåòðà ïëàòû ACL-8113.
3. Çàìå÷àíèÿ
Äëÿ ñáîðêè è ðàáîòû äàííîãî ìîäóëÿ íóæíà òîëüêî áèáëèîòåêà comedilib êîòîðàÿ ïðèñóòñòâóåò â ðåïîçèòîðèÿõ áîëüøèíñòâà äèñòðèáóòèâîâ. Îäíàêî ìîäóëè äðàéâåðîâ ïëàò íóæíî ñîáèðàòü îòäåëüíî, à àðõèâ ìîæíî çàãðóçèòü çäåñü: http://comedi.org/download.html.
Ðàáîòà äàííîãî ìîäóëÿ ïðîâåðåíà íà ñëåäóþùèõ ïëàòàõ:
- Advantech PCL-725, PCL-726
- ADLink ACL-8113
Ññûëêè