YOKOGAWA FA-M3 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

OS:
    Windows 7 Professional  32bit OS
CPU：
    Intel(R) Core(TM) i7 CPU 860 @2.80GHz
Memory：3.00GB
OPC Server：
    DeviceXPlorer OPC Server Ver4.2.0.2
OPC Client：
    OPCClient sample VcSampleOpc(C++)
Cable：
    100BASE-TX cross cable connecting directly

OPC Server setting

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

CPU:FA-M3 F3 SP53-4S
Communication Unit:F3LE01-5T
Device:D0-D16384
Max scan time:1.7msec

Communication Performance

SyncMode(default)

(sec)

	1024	2048	4096	8192	16K	32K	64K	128K
Average	0.507	0.957	1.948	3.821	7.759	15.556	30.977	62.468
Max	0.531	0.999	1.966	3.884	7.874	15.647	31.075	62.602
Min	0.484	0.921	1.919	3.775	7.659	15.444	30.872	62.119

AsyncMode

(sec)

	1024	2048	4096	8192	16K	32K	64K	128K
Average	0.089	0.156	0.334	0.533	1.034	2.083	4.168	8.355
Max	0.094	0.156	0.281	0.546	1.045	2.091	4.181	8.377
Min	0.078	0.156	0.221	0.531	1.029	2.075	4.165	8.331

Results

In case of continuous integer array tag (D register) , it is possible to get max 2,000 points per sec by using normaly access. Max 16,000 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.

[Jun 2010]