Using the Server Monitor
Server Statistics
This panel shows the current server statistics. This is useful for
viewing the server status in real-time.
Server StatisticsView
The following statistics are available:
-
Server State: Current server state(running, stopped).
-
Server Time: Current server time (important for
timestamps).
-
Groups: Number of OPC groups in the server.
-
Clients Connected: Number of clients connected to the
server.
-
Scan Status: Current state of server data acquisition
core(active, inactive).
-
Active Computers: Number of computers under real-time
monitoring.
-
Active Items: Number of computer items under real-time
monitoring.
-
Server Status: Current status of server(normal or scan
overlap).
If the server status indicates scan overlaps, it means that your
current configuration is not optimized for scanning the configured
computers. Scan overlaps happen when the server time becomes
insufficient to maintain the configured computer refresh rate. The
main cause for this problem is a high response time from some
computers, causing the server to wait too much time for a computer
response. Here are some tips for improving performance:
-
Disable the scan of unused computers. Make sure that the server
is scanning only computers which will be used by your OPC
clients.
-
Remove all unused items that are published. Make sure that you
are publishing only items that will be used by your OPC
clients.
-
On congested networks, the information may suffer high delays
to reach the server. Make sure that the PerfMon server is
connected to the monitored computers through good links.
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