Omron NX-ECC201 User Manual page 264

12 Communications Performance
 Unit Configuration and Data Sizes in the EtherCAT Slave Terminal
The unit configuration and data sizes in the EtherCAT Slave Terminal are given in the following
table.
Unit type
EtherCAT Cou-
pler Unit
Digital Input Units
Digital Output
Units
Analog Input Units NX-AD4608
Analog Output
Units
Total for EtherCAT Slave Terminal
Total for NX Units
*1. The input data size of one NX-ID3343 is 0.5 bytes.Therefore, the byte size of the input data is
8 Units × 0.5 bytes, or 4 bytes.
*2. The output data size of one NX-OD3153 is 0.5 bytes. Therefore, the byte size of the input data
is 8 Units × 0.5 bytes, or 4 bytes.
*3. This Unit has INT data, so there are 0 Units.
*4. This Unit has INT data, so there are 0 Units.
 Calculating the Elements of the I/O Response Times
This section shows how to calculate the elements of the I/O response times.
(a) Calculating Edelay
The following parameters are required to calculate the value.
Number of EtherCAT
slaves
EtherCAT frame length
in bytes
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 Edelay is as follows:
Formula: Edelay = 1.24 × Number of EtherCAT slaves
12 - 10
Model num- Number
ber of Units
NX-ECC201 1
NX-ID3343 8
NX-OD3153 8
1
NX-DA3605 1
19
18
Parameter Value
1
64 bytes
+ 0.09 × EtherCAT frame length in bytes
= 1.24 × 1 Unit + 0.09 × 64 bytes
= 7
Byte size
Byte size of
of output
input data
data
34 0
0
*1
4
0 *2
4
16 0
0 8
54 12
20 12
An EtherCAT Slave Terminal is counted as one
EtherCAT slave.
The EtherCAT Slave Terminal has a total input
data size of 54 bytes and a total output data size
of 12 bytes. Both the input data size and output
data size are less than 64 bytes, so 64 bytes is
used.
NX-series EtherCAT Coupler Unit User's Manual (W519)
No. of NX No. of NX
Units with Units with
BOOL input BOOL output
data data
--- ---
8 ---
--- 8
---
*3
0
---
*4
0
--- ---
8 8
Remarks
(Unit: μs)