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Performance

MELSEC-Q seiries 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 8.1 64bit OS
CPU Intel Core i7-4700MQ CPU @2.40GHz
Memory 16GB
OPC Server DeviceXPlorer OPC Server Ver5.2.0.1
OPC Client C# 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 Q06UDVCPU
Ethernet unit QJ71E71-100
Register D0-D16383
Max scan time 0.04msec

Communication Performance

[ CPU Built-in Ethernet ]

(sec)

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  1024 2048 4096 8192 16K 32K/2D 64K/4D 128K/8D
Average 0.005 0.008 0.015 0.028 0.056 0.112 0.221 0.461
Max 0.008 0.009 0.018 0.032 0.071 0.128 0.228 0.501
Min 0.004 0.008 0.013 0.027 0.053 0.107 0.216 0.437

[ Ethernet Unit ]

(sec)

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  1024 2048 4096 8192 16K 32K/2D 64K/4D 128K/8D
Average 0.015 0.026 0.048 0.098 0.200 0.388 0.788 1.567
Max 0.015 0.025 0.045 0.088 0.186 0.354 0.740 1.507
Min 0.005 0.013 0.015 0.036 0.061 0.130 0.228 0.459

Results

In case of CPU Built-in CPU port, DxpSERVER can get max 256K word points per sec.
In case of Ethernet Unit port, DxpSERVER can get max 90K word 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).
*In case of 64K points access , Read 64K points by using 4 devices.( 16K point per 1 device).
*In case of 128K points access , Read 128K points by using 8 devices.( 16K point per 1 device).
*The result only means our examination, it doesn't guarantee performance.
[Sep 2014]

MELSEC-Q CC-Link IE Control

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++)

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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Board Q81BD-J71GP21-SX
CPU Q04UDEHCPU
Register W0-W1FFF(Host)
Register D0-D8191(Another)
Max scan time 0.06msec

Communication Performance

[ Host Station ]

(sec)

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  1024 2048 4096 8192 16K 32K 64K 128K
Average 0.013 0.013 0.014 0.028 0.049 0.126 0.262 0.531
Max 0.018 0.018 0.018 0.035 0.057 0.143 0.281 0.538
Min 0.007 0.007 0.008 0.026 0.036 0.104 0.234 0.527

[ Another Station ]

(sec)

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  1024 2048 4096 8192 16K 32K 64K 128K
Average 0.031 0.060 0.124 0.245 0.499 0.993 1.998 4.093
Max 0.038 0.065 0.140 0.255 0.555 1.083 2.293 4.447
Min 0.027 0.046 0.111 0.226 0.457 0.883 1.816 3.628

Results

In case of continuous data memory(W), it is possible to get max 128K points per sec.
In case of another station access, it is possible to get max 32K 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.
[Aug 2012]

MELSEC-FX seiries 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) i5 CPU @3.20GHz
Memory 4.00GB
OPC Server DxpSERVER OPC Server Ver5.1.0.1
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 FX3U-16M
Communication unit FX3U-ENET-ADP
Register D0-D8191
Max scan time 1msec

Communication Performance

(sec)

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  1024 2048 4096 8192 16K 32K 64K 128K
Average 0.351 0.752 1.415 2.819 5.626 11.965 22.302 44.679
Max 0.790 1.525 2.865 5.745 11.437 22.946 43.995 84.825
Min 0.346 0.663 1.268 2.738 5.389 11.020 22.022 43.961

Results

In case of continuous data memory(D), 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.
[Sep 2013]

Interface performance

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