HITACHI HIDIC Performance

HIDIC EH150 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:EH-CPU448
Communication unit:EH-ETH
Register:WR0-WR3FFF
Max scan time:48msec

Communication Performance

(sec)

	1024	2048	4096	8192	16K	32K	64K	128K
Average	0.387	0.756	1.442	2.855	5.767	11.569	23.283	46.578
Max	0.422	0.780	1.514	2.933	5.881	11.794	23.564	46.802
Min	0.359	0.734	1.373	2.792	5.694	11.456	23.162	46.207

Results

In case of continuous internal registers(WR) , it is possible to get max 3,000 points per sec.

Comment

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

[Jun 2010]