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nv series Ethernet connection

Add array OPCItems as Advise from a OPC Client.
It is measured reading time from added OPCItems. Communication performance is defined as average time of ten times measurement.
This time means to read the value of a continuous area of the device.

PC specification

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OS Windows 7 Professional 64bit OS
CPU Intel(R) Core(TM) i5 CPU @3.20GHz
Memory 4.00GB
OPC Server DxpSERVER OPC Server Ver5.1.0.1
OPC Client OPCClient sample VcSampleOpc(C++)
Cable 100BASE-TX cross cable connecting directly

OPC Server setting

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Protocol Timer Tick 10msec
Timer Tick for Async Update Mode 10msec
Multi Access Mode Enable
Multi Access for Snyc Asnyc Disabled
Async Update Mode Disabled

PLC setting

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Communication unit EN651A
Register DT0-DT4096
Max scan time 12.4msec

Communication Performance


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  1024 2048 4096 8192 16K 32K 64K 128K
Average 0.361 0.640 1.221 2.445 4.872 9.808 19.581 39.161
Max 0.421 0.688 1.280 2.499 4.941 9.929 19.710 39.370
Min 0.308 0.598 1.177 2.402 4.827 9.680 19.461 38.932


In case of continuous data register(DT), it is possible to get max 4,000 points per sec.


*Graph displays average time of ten times measurement.(1point = 1word)
*In case of 16K points access , Read 16K points by using 2 devices.( 8K point per 1 device).
*The result only means our examination, it doesn't guarantee performance.

[Sep 2013]

Interface performance

Results of measurement of each interface(eg.sync /async /datachange event etc).(detail)