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Topic starter
I would like to know how on servers configured as an Association with "multiple active servers" to determine which of the servers is connected to the SCADA client network. On the client it can be defined, and how to learn on the server if on the client it is forbidden to change variables of the server by command SCADA-basic VARIABLE(WRITE)=0? Well or what mechanism allowing to learn on the client on what specifically the server the client is directed should be used if from the client it is forbidden to send commands (management is forbidden).
Posted : 23/06/2020 7:13 pm
Hi Roman,
Your question is quite difficult to understand actually.
First of all, you are using the word "learn" and I think it is not really the good one!
Let me explain the mechanism when the association is "multiple active".
1. Both servers are "Active" in the Data Acquisition point of view
2. Both servers are "Active" In the Networking point of view ONLY if the Availability rate are the same.
2a. In this case each client is refreshed by the first Server that replied during the Subscription phase
2b. You can force the Client to be refreshed by one specific Server by using the instruction LAN
3. If 1 server has an higher rate then he is the active server for all clients.
Now, about your question (I try to reply...), if you execute the instruction VARIABLE("WRITE", 0)on 1 Client then operator won't be able to set the value of any variables.
Nico
Posted : 24/06/2020 4:43 pm
Nico,
For multi-active, if both server have availability of 100%, I was under the impression that the client will be refreshed by the server with lower station id, was this not the case?
Thanks,
Kantha
Posted : 24/06/2020 5:03 pm
Hmmm, not sure, I always thought it is the first Server that replies.
Who knows except Dominique?
Nico
Posted : 24/06/2020 5:23 pm
Topic starter
Thank you Nicolas, i can try to explain problem from my customer
The task , there are 2 Scada Server and many Clients.
clients are generally prohibited from writing to variables.How to find out on which server a particular client is located?
We can find out the total number of connected clients on 1 server, force switch to any server too.
And due to the fact that if there are too many clients on one server, the display speed may be weak, and changes in variables cease to be fixed.
2 people are sitting at different computers nearby, look at the same picture, and see different values.
Posted : 26/06/2020 3:26 pm