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Performance

FA-M3(R) series Ethernet communication

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 32bit OS
CPU Intel(R) Core(TM) i7 CPU 860 @2.80GHz
Memory 3.00GB
OPC Server DxpSERVER OPC Server Ver5.0.1.1
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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CPU FA-M3 SP71-4N
Communication Unit F3LE01-5T
Device D0-D16384
Max scan time 1.7msec

Communication Performance

SyncMode(default)

(sec)

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  1024 2048 4096 8192 16K 32K/2D 64K/4D 128/8D
Average 0.158 0.320 0.639 1.280 2.574 5.119 10.239 20.264
Max 0.161 0.328 0.643 1.285 2.586 5.159 10.387 20.629
Min 0.151 0.315 0.632 1.274 2.566 5.087 10.169 19.577

AsyncMode

(sec)

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  1024 2048 4096 8192 16K 32K 64K 128K
Average 0.049 0.089 0.173 0.342 0.687 1.386 2.750 5.322
Max 0.056 0.094 0.178 0.355 0.710 1.419 2.801 5.742
Min 0.044 0.083 0.166 0.333 0.673 1.327 2.688 4.754

Results

In case of continuous integer array tag (D register) , it is possible to get max 6,000 points per sec by using normaly access. Max 24,000 points per sec by using asynchronous access. As for the asynchronization access, the performance is about eight times as early as the usually access.

Comment

*Graph displays average time of ten times measurement.(1point = 1word)
*In case of 32K points access , Read 32K points by using 2 devices.( 16Kpoint per 1 device).
*The result only means our examination, it doesn't guarantee performance.

[Aug 2012]

Interface performance

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