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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
(b) Calculating Etxj
The value of Etxj is fixed. The value is given below.
(c) Calculating Tmax-InTrans
There is only one EtherCAT Slave Terminal, so the value is as follows:
Tmax-InTrans = T#1-InTrans
The following parameters are required to calculate T#1-InTrans.
Refer to Unit Configuration and Data Sizes in the EtherCAT Slave Terminal on page 12-10
for the values of the above parameters.
Therefore, the value of Tmax-InTrans is as follows:
Formula: Etxj = 100
(Unit: μs)
Parameter Value Remarks
Total byte size of the
input data of the NX Unit
20 bytes This is the total input data size of the NX Unit.
Number of NX Units 18 Units ---
Number of NX Units with
BOOL input data
8 Units ---
Formula: Tmax-InTrans = 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)
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