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Performance

SIMATIC S7-1500 series Ethernet connection

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 Ver5.2.0.1
OPC Client C# RCW OPC Client
Cable direct 100BASE-TX cross cable

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 CPU315
Communication unit CP343
Register DB1:0-DB1:8191 * 4DB
Max scan time 1msec

Communication Performance

[Built-in Ethernet]

(sec)

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  1024 2048 4096 8192 16K 32K 64K 128K
Average 0.008 0.015 0.024 0.045 0.086 0.196 0.414 0.821
Max 0.008 0.016 0.026 0.046 0.093 0.208 0.450 0.834
Min 0.007 0.015 0.023 0.043 0.078 0.176 0.393 0.807

Results

In case of Built-in Ethernet, to access continuous Data Block(DB), it is possible to get max 150,000 points per sec.

Commnet

*Graph displays average time of ten times measurement.(1point = 1byte)
*The result only means our examination, it doesn't guarantee performance.
[September 2014]

 

SIMATIC S7-300 series Ethernet connection

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 CPU315
Communication unit CP343
Register DB1:0-DB1:8191,DB2:0-DB2:8191,DB3:0-DB3:8191,DB4:0-DB4:8191
Max scan time 1msec

Communication Performance

[CP343]

(sec)

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  1024 2048 4096 8192 16K 32K
Average 0.182 0.368 0.724 1.427 2.843 5.703
Max 0.190 0.380 0.765 1.461 2.882 5.733
Min 0.172 0.360 0.700 1.412 2.811 5.653

[Built-in Ethernet]

(sec)

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  1024 2048 4096 8192 16K 32K
Average 0.050 0.100 0.190 0.370 0.742 1.486
Max 0.050 0.101 0.191 0.370 0.743 1.489
Min 0.050 0.100 0.190 0.370 0.741 1.477

Results

In case of Ethernet unit, to access continuous Data Block(DB), it is possible to get max 6,000 points per sec.
In case of Built-in Ethernet, to access continuous Data Block(DB), it is possible to get max 20,000 points per sec.
CPU Built-in Ethernet is about three times as earlier as the Ethernet unit.

Commnet

*Graph displays average time of ten times measurement.(1point = 1byte)
*The result only means our examination, it doesn't guarantee performance.
[Jun 2010]

Interface performance

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