Omron NX-ECC201

12 Communications Performance
12 - 10
NX-series EtherCAT Coupler Unit User’s Manual (W519)
 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.
 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.
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:
Unit type
Model num-
ber
Number
of Units
Byte size of
input data
Byte size
of output
data
No. of NX
Units with
BOOL input
data
No. of NX
Units with
BOOL output
data
EtherCAT Cou-
pler Unit
NX-ECC201 1 34 0 --- ---
Digital Input Units NX-ID3343 8
4
*1
*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.
0 8 ---
Digital Output
Units
NX-OD3153 8 0
4
*2
*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.
--- 8
Analog Input Units NX-AD4608 1 16 0
0
*3
*3. This Unit has INT data, so there are 0 Units.
---
Analog Output
Units
NX-DA3605 1 0 8 ---
0
*4
*4. This Unit has INT data, so there are 0 Units.
Total for EtherCAT Slave Terminal 19 54 12 --- ---
Total for NX Units 18 20 12 8 8
Parameter Value Remarks
Number of EtherCAT
slaves
1 An EtherCAT Slave Terminal is counted as one
EtherCAT slave.
EtherCAT frame length
in bytes
64 bytes 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.
Formula: Edelay = 1.24 × Number of EtherCAT slaves
+ 0.09 × EtherCAT frame length in bytes
= 1.24 × 1 Unit + 0.09 × 64 bytes
= 7
(Unit: μs)