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12 Communications Performance
NX-series EtherCAT Coupler Unit User’s Manual (W519)
12-1 Performance of Process Data Communications
12
12-1-1 I/O Response Times for Synchronous I/O Refreshing
(g) Calculating Tnx-Indelay
Tnx-Indelay of an NX-ID3343 Digital Input Unit is defined as the ON/OFF response time
plus the input filter time. The ON/OFF response time is 0.10
μs and the input filter time is 0
μs.
*1
*1. Calculation condition (5) says there is no filter, so the time is 0 μs.
Therefore the value of Tnx-Indelay for the NX-ID3343 Digital Input Unit is as follows:
(h) Calculating Tnx-Outdelay
The Tnx-Outdelay of an NX-OD3153 Digital Output Unit is defined as the ON/OFF
response time. The ON/OFF response time is 0.30
μs.
Therefore the value of Tnx-Outdelay for the NX-OD3153 Digital Output Unit is as follows:
Calculating the I/O Response Times
The I/O response times are as follows based on the calculation results for the elements.
Tnx-Indelay = 0.10
(Unit: μs)
Tnx-Outdelay = 0.30
(Unit: μs)
Formula:
Maximum I/O response time = Tcycle × 2 + Edelay + Etxj + Tmax-InTrans + Tmax-OutTrans +
Tmax-InProc + Tmax-OutProc + Tnx-Indelay + Tnx-Outdelay
= 500 × 2 + 7 +100 + 156.12 + 47.38 + 0.00 + 40.00 + 0.10 + 0.30
= 1350.90
(Unit: μs)
Formula:
Minimum I/O response time = Tcycle + Edelay + Etxj + Tmax-InTrans + Tmax-OutTrans +
Tmax-InProc + Tmax-OutProc + Tnx-Indelay + Tnx-Outdelay
= 500 + 7 +100 + 156.12 + 47.38 + 0.00 + 40.00 + 0.10 + 0.30
= 850.90
(Unit: μs)
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