OPCDA Performance

OPC Server connection

This examination needs 2 OPC Servers. Our OPC Servers is used for the Client-side and another is used for the Server-side.
It is measured reading time of Server-side's Common memory. 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(Client-side)

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

PC specification(Server-side) that is connected by Client-side PC

OS:
Windows XP Professional SP3 32bit OS
CPU：Intel(R) 4CPU @2.80GHz
Memory：2.00GB
OPC Server：
MELSEC OPC Server Ver3.12 build 6
Register：D0-D8191(Simulation mode as common memory)

Communication Performance

≪Local connection≫

(sec)

	1024	2048	4096	8192	16K	32K	64K	128K
Average	0.001	0.002	0.004	0.006	0.015	0.031	0.048	0.092
Max	0.001	0.003	0.004	0.008	0.017	0.033	0.064	0.119
Min	0.001	0.001	0.004	0.003	0.008	0.027	0.024	0.059

≪Remote connection(DCOM)≫

(sec)

	1024	2048	4096	8192	16K	32K	64K	128K
Average	0.002	0.002	0.004	0.008	0.015	0.043	0.054	0.095
Max	0.003	0.003	0.004	0.008	0.015	0.160	0.065	0.133
Min	0.001	0.002	0.002	0.006	0.007	0.025	0.028	0.070

Results

In case of continuous Common memory, it is possible to get max 128,000 points per 0.1 sec. And it is neary time between local connection and DCOM connection.

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]