Products

Performance

ControlLogix 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 @2.93GHz
Memory	3.00GB
OPC Server	DeviceXPlorer 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	Control Logix 1765(Logix5561)
Communication Unit	1756-ENBT (EtherNet/IP)
Device	IntArray[0]-IntArray[16383]
Max scan time	1.6msec

Communication Performance

(sec)

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	1024	2048	4096	8192	16K	32K	64K	128K
Average	0.048	0.091	0.184	0.363	0.713	1.528	2.939	6.163
Max	0.054	0.094	0.190	0.372	0.725	1.806	3.448	7.199
Min	0.044	0.084	0.178	0.350	0.700	1.126	2.564	4.021

Results

In case of continuous integer array tag , it is possible to get max 15,000 points per sec.

Commnets

*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).