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Measurement of communication performance |
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This page is established for the OPC Server users who integrate their system and helps them to understand the OPC Server Response Ability.
# these data is the test report in our environment and we would not guarantee the value.
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Test Method |
# In this test, PC that works the OPC Server is connected with the PLC by 1:1. And the device is registered in a group as short tag and communicate with 'IsActivate = TRUE' / 'IsSubscribed = TRUE'.
# The measured value is the average for counted happening DataChange event in a time.
# The tested program (Visual Basic 6.0) measuring elapse time is here.
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Test Environment (Tested on September 2007) |
| CPU |
Pentium4 2.8GHz |
HyperThreading CPU |
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| OS |
Windows XP Professional SP2 |
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| OPC Server |
Version |
Ver4.0.0.1 |
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OPC Thread Priority |
NORMAL |
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| OPC Client |
Visual Basic 6.0 / SP6 |
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| Ethernet Module |
EH-ETH |
100BASE-TX |
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| Scan Time |
Under 48ms |
The device value is changed every scan |
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# Access points is the continuous area of "WR".
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Result Data - Ethernet Interface (Connection of plural PLC) |
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Frequency |
1024 Points |
2048 Points |
4096 Points |
8192 Points |
16K Points |
32K Points/2G |
64K Points/4G |
128K Points/8G |
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1 |
0.419 |
0.744 |
1.534 |
2.966 |
5.966 |
11.753 |
--- |
--- |
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2 |
0.406 |
0.763 |
1.491 |
2.994 |
6.028 |
11.759 |
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3 |
0.403 |
0.756 |
1.462 |
2.997 |
5.991 |
11.753 |
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4 |
0.403 |
0.772 |
1.525 |
3.031 |
6.038 |
11.756 |
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5 |
0.397 |
0.759 |
1.500 |
3.000 |
5.972 |
11.741 |
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6 |
0.394 |
0.734 |
1.459 |
2.991 |
6.000 |
11.759 |
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7 |
0.375 |
0.759 |
1.525 |
3.037 |
6.013 |
11.700 |
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8 |
0.384 |
0.775 |
1.506 |
2.988 |
5.972 |
11.831 |
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9 |
0.384 |
0.756 |
1.500 |
3.000 |
6.009 |
11.775 |
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10 |
0.394 |
0.763 |
1.531 |
3.003 |
5.991 |
11.787 |
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| Minimum |
0.375 |
0.734 |
1.459 |
2.966 |
5.966 |
11.700 |
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| Maximum |
0.419 |
0.775 |
1.534 |
3.037 |
6.038 |
11.831 |
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| Average |
0.396 |
0.758 |
1.503 |
3.001 |
5.998 |
11.761 |
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# Measurements in the table are mean values for every five times of the communication respectively.
"Frequency" is measured in addition repeatedly ten times.
Therefore, the average value of the last line means the average of communicating 50 times.
# "128K Points / 8G" means that it registers by dividing the data of 128K point
(1,310,720 points = 128 * 1024 points) into eight OPC groups and access. |
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