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12 Communications Performance
NX-series EtherCAT Coupler Unit User’s Manual (W519)
12-1 Performance of Process Data Communications
12
12-1-2 I/O Response Times for Free-Run Refreshing
(c) Calculating T#1-InTrans
The value of T#1-InTrans is as follows:
(d) Calculating T#1-OutTrans
The value of T#1-OutTrans is as follows:
(e) Calculating T#1-Free_I/OCycle
T#1-exsoft is calculated with the calculation formula for T#1-Free_I/OCycle.
There are 18 NX Units.
Based on the calculation results for (c) and (d), the values of T#1-InTrans and T#1-Out-
Trans are as follows:
T#1-InTrans = 156.12 μs
T#1-OutTrans = 47.38 μs
Therefore, the value of T#1-exsoft is as follows:
T#1-InTrans
= 9.22
×
(Integer quotient of total byte size of the input data of the NX Unit
÷
32)
= 0.55
×
(Remainder of total byte size of the input data of the NX Unit
÷
32)
+ (0.34 × Number of NX Units with BOOL input data + 3.41)
+ 3.53 × Number of NX Units
+ 0.014 × Total bytes size of NX Unit input data
+ 75.17
= 9.22 × (Integer quotient of 20 bytes ÷32)
+ 0.55 × (Remainder of 20 bytes ÷32) + (0.34 × 8 Units + 3.41)
+ 3.53 × 18 Units + 0.014 × 20 bytes + 75.17
= 9.22 × 0.00 + 0.55 × 20.00 + (0.34 × 8 Units + 3.41)
+ 3.53 × 18 Units + 0.014 × 20 bytes + 75.17
= 156.12
(Unit: μs)
Formula: T#1-OutTrans
= 11.71
×
(Integer quotient of total byte size of the output data of the NX Unit
÷
32)
= 0.46
×
(Remainder of total byte size of the output data of the NX Unit
÷
32)
+ (0.19 × Number of NX Units with BOOL output data + 2.93)
+ 0.38 × Number of NX Units
+ 0.014 × Total bytes size of NX Unit output data
+ 30.40
= 11.71 × (Integer quotient of 12 bytes ÷32)
= 0.46 × (Remainder of 12 bytes ÷32)
+ (0.19 × 8 Units + 2.93) + 0.38 × 18 Units
+ 0.014 × 12 bytes+ 30.40
= 11.71 × 0.00 + 0.46 × 12.00 + (0.19 × 8 Units + 2.93)
+ 0.38 × 18 Units + 0.014 × 12 bytes + 30.40
= 47.38
(Unit: μs)
Formula: T#1-exsoft = 60 + {0.3 × {T#1-InTrans + T#1-OutTrans
+ (0.75 × Number of NX Units) + 54}} ÷0.7
= 60 + {0.3 × {156.12 + 47.38 + (0.75 × 18 Units) + 54}} ÷0.7
= 176.14
(Unit: μs)
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