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NAPOPC Server 004

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 Q: What is the performance of NAPOPC DA Server?

 Ans: 

We used a VB demo to test the performance (polling) of reading data from NAPOPC DA Server and received the following performance data:           
Version Process UI From Cache From Device 1 Version Process UI From Cache From Device
1.31 Yes 601 228 1 2.11 Yes 1716

1

1.31 No 1058 263 1        
2.00 Yes 1095 268 1 1 1 1 1
2.00 No 3122 324 1        
2.03 Yes 1141 318 1        
2.03 No 3101 398 1        
        1        
Unit Readings/Sec (Readings per Second) 1 Unit Readings/Sec (Readings per Second)
Modules  I-7520, I-7011 1 Modules  I-7520, I-7012
Channel 0 1 Channel 0
Data Type floating point value (Analog Input) 1 Data Type floating point value (Analog Input)
Baud Rate 115200 BPS 1 Baud Rate 115200 BPS
Checksum disabled 1 Checksum disabled
Data format N-8-1 1 Data format N-8-1
timeout 200 milliseconds 1 timeout 200 milliseconds
CPU PII 300MHz 1 CPU P4 1.6GHz
RAM 128 MB 1 RAM 512 MB
Platform Windows NT 4.0 (SP3) 1 Platform Windows XP Professional 2002 SP1

This VB demo program uses the Automation Interface to access the OPC. In the background, the Automation Interface goes through the COM interface to access OPC. Thus, this may cause the lower performance.

User's programs can also access the OPC server via the COM interface directly. This may cause more complicated codes, but result in better performance.


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Written by Gary 

Date:2004/9/7