March 12, 2021 at 12:18 pm #8500
Hi Friends ,
I seem to have an issue catching a single pulse . My Scada unit offers me a single pulse for a channel which I use to start a calculation . Thing is sometimes the program does not see the pulse . I am wondering if its the scan time of Rapid Scada … not sure how this works , is it like a PLC and takes time to work through all the Channels , I have 268 channels mostly calculated types with 32 real input types .
RichMarch 12, 2021 at 12:25 pm #8501manjey73Participant
Where does the momentum come from? from the PLC ? it can appear in the period between the PLC requests – then the PLC program requires a delay of this pulse for the network variable. Or did you mean something else ?March 12, 2021 at 1:04 pm #8502
Hi , the single pulse comes from a sensor at the begging of a process line .
The single pulse only feeds the Scada unit which sends it to the Rapid Scada program.
RichMarch 12, 2021 at 2:37 pm #8503
You need to specify a pulse length and polling rate. And make sure that polling rate is fast enough to detect a pulse.March 15, 2021 at 8:37 am #8509
Can you give me some more detail please .
My pulse is less than 1 second , where do I set up the polling rate ?
RichMarch 15, 2021 at 10:07 am #8510
where do I set up the polling rate ?
It’s in Communicator – Communication line – Line Parameters – Request Sequence
Could you post a part of communication line log here to analyze?March 16, 2021 at 9:01 am #8511March 16, 2021 at 12:34 pm #8513
Can you explain the Timeout; Delay; Time ; Period; entries please
Please read this. If something is not clear in the article, ask.
Could you post a part of communication line log here to analyze? It’s in Line StatsMarch 17, 2021 at 9:51 am #8518March 17, 2021 at 11:36 am #8519
According to the log, your polling rate is about 1 second. It depends on network latency and controller speed.
So you need pulse length at least 2 seconds to detect it stable.March 17, 2021 at 12:06 pm #8524
Hi Mikhail ,
Yes I’m seeing that now .
Nothing on the line is happening quickly so I may need to just look at extending the pulse from the sensors ……
Thank you for your help .
RichMarch 18, 2021 at 9:32 am #8532
Hi Mikhail ,
About the scan times , my system is on a VM with a single CPU , this is showing high CPU usage 85-100% , could this be causing my delays ? …… what number of CPU’s would you recommend on a Windows VM machine , I have 9 Scada slaves each giving me 4 inputs .
RichMarch 18, 2021 at 1:14 pm #8535
Could you make a screenshot of the CPU usage by processes (Task Manager)?March 19, 2021 at 9:13 am #8537March 19, 2021 at 2:52 pm #8544
What you can do to decrease CPU load:
1. Use RAM disk for C:\SCADA\ScadaComm\Log directory.
2. Add this log directory to antivirus exception.
3. Increase delays after request in request sequence or after line cycle.
- You must be logged in to reply to this topic.