Hello Wolfgang, The answer will depend on the hardware you use for your machine, I can tell you based on my experience with Siemens equipment.
*> If I am looking for gathering as detailed as possible Data from Machines… what would be first choice ? Subcription for ChangedValues ? Active Polling ? * Do you want a (1) record historical data with that resolution in the time signature or do you really want to (2) capture an event with that time precision? For the first case you can sample times by polling between 50 to 80 msec, this for an S7-300 and between 17 to 20 msec for an S7-400. I do not have an S7-1500 physically, but the performance should be close to that of an S7-400, the same should happen with VIPA CPUs. There are other sampling techniques for the S7-300 / 400 that guarantee a stable subscription with multiples of 100 msec. For the second case (events), you can use the data capture with the CPU warning system with the SFC ALARM, NOTIFY, etc. which guarantee the capture of data at ms, this is very well documented by Siemens. The important thing is that the timestamp comes from the PLC not from the computer where you are running PLC4X. *> I know that these are also quite machine/protocol specific questions but it would be interesting to learn what numbers could be achieved by using PLC4x ? * You are correct, the Modbus driver of PLC4X, I have captures of 10 msec, but we are talking about Pears and Apples. My grain of sand, Best regards, El jue., 14 may. 2020 a las 13:00, Wolfgang Huse (<[email protected]>) escribió: > Hi, > maybe you could share some experiences from realworld-use-cases how to > work with PLC4x ? > If I am looking for gathering as detailed as possible Data from Machines… > what would be first choice ? Subcription for ChangedValues ? Active Polling > ? > > What is an interval which is usable in real world for polling ? 100ms, > 10ms ? > > I know that these are also quite machine/protocol specific questions but > it would be interesting to learn what numbers could be achieved by using > PLC4x ? > > Mit freundlichen Grüßen – With kind regards > > Wolfgang Huse > > -- *CEOS Automatización, C.A.* *GALPON SERVICIO INDUSTRIALES Y NAVALES FA, C.A.,* *PISO 1, OFICINA 2, AV. RAUL LEONI, SECTOR GUAMACHITO,* *FRENTE A LA ASOCIACION DE GANADEROS,BARCELONA,EDO. ANZOATEGUI* *Ing. César García* *Cel: +58 414-760.98.95* *Hotline Técnica SIEMENS: 0800 1005080* *Email: [email protected] <[email protected]>*
