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Hi Mik,
I am trying to develop a virtual device driver.
Its functionality feels like Flash or Rom in PLC.
Now I have encountered a problem.When I use the send command function to write a large amount of data to a virtual device, the session will be suspended.
When I use writing curdata to a virtual device, if the frequency is low, the data will become 0.
How can I develop virtual devices correctly and persist data correctly within them.
Hi Zeus,
When I use the send command function to write a large amount of data to a virtual device, the session will be suspended.
What amount of data you try to send using a command?
When I use writing curdata to a virtual device, if the frequency is low, the data will become 0.
Could you explain?
Hi，
The first situation
I use sendcommand sending about 30 commands to virtual device per second and the base session will be suspended. The session will wait until the cmd is handeld.The second situation
I use the writcurdata method to send data to the server and persist the data to a dat file. When the line starts, read and assign the dat file to curdata.I just want to persist the data to Scadaserver, treat it as a long-term valid data, and use it as a current value when reading it
Hi,
I use sendcommand sending about 30 commands to virtual device per second and the base session will be suspended. The session will wait until the cmd is handeld.
If commands require heavy processing, implement a queue to process them in background.
I use the writcurdata method to send data to the server and persist the data to a dat file.
To analyze the issue, you should use a debugger or log files.
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