Schneider Automation Modicon Quantum Ethernet Manuel d'utilisateur Page 211

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Transferring Data with the I/O Scanner
33002479 06 07/2008 211
140 CPU 434 12A
with
140 NOE 771 x1
Module
The 140 CPU 434 12A with an NOE 771 x1 (v3.3) was used for the following
measurements:
The plot shows four lines representing the number of scanned devices:
z 1 device
z 8 devices
z 16 devices
z 32 devices
The four lines are indistinguishable at this scale because the response times are so
similar. You can see the similarity in the following table of data from which the above
graph was plotted:
PLC Scan Time (ms)
Time (ms)
Number of Devices to Scan Time from Scanned Device Input to Scanned Device Output (ms)
434 12A + NOE 771 x1 (v3.3) 10 ms scan 20 ms scan 50 ms scan 100 ms scan 200 ms scan
1 device 41 73 179 358 665
8 devices 42 75 180 360 666
16 devices 44 77 182 361 668
32 devices 46 79 185 364 671
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