Channels in memory only

[zzz]

Hi MikHail,

Is it possible to support channels that only exist in memory & data table [now]. Or put it in another way, is possible to disable data archiving for certain channel?

The usage to us seems very common.
e.g.
– When certain values from gauges are just for commissioning but not logging.
By commissioning I mean the devices, gauges etc. which have parameters accessible through remote protocol, e.g. Is the communication mode set to read-only ? Is the de-noise filter set to correct level ? these are necessary for commissioning; retrieved on request; there is little value to log them all or put them in constant watch.

– When many channels are used as intermediate value for trigger.
In case there are tens of groups of devices connected to interact with each other, Gauge1+G3+G5 may work together to evaluate one complicate rule. The result is not important in logs, but the G1,G3,G5 readings are. Some times there are intermediate values depending on other intermediate values. As the inter-dependency of those values increase, the intermediate value logging quickly become very redundant.

I saw there is a command type named REQUEST. I can’t find reference material for it anywhere. What does it do ? can it work for the my first case ?

zzz

• This topic was modified 3 years, 4 months ago by zzz.

[Mikhail]

Hi,

This feature will be supported in the next generation Rapid SCADA 6. It will be possible to choose for a channel, which archives it is written to.

I saw there is a command type named REQUEST.

By sending the command of the Request type you can perform a device poll out of turn. It is useful when there are many devices and an operator wants to poll a device immediately.

[zzz]

So, sounds like if I set the channel to a special null archive,
like /dev/null in linux, that channel’s logging is disabled.

Thanks for the explaination, looking forward to the new version!

[Mikhail]

So, sounds like if I set the channel to a special null archive,
like /dev/null in linux, that channel’s logging is disabled.

I think, this is different.

[zzz]

Oh, I guess, you meant user can choose to write to []current []hour []minute archives.
He just need to untick []hour and []minute?

[Mikhail]

I lost the question. Could you explain the last question?

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