Omron NX-ECC201 User Manual page 257

Timing Chart and Configuration Elements of the I/O Response Time
A timing chart for the I/O response time with synchronous I/O refreshing is provided in the following fig-
ure. This timing chart shows the maximum I/O response time.
PLC Function
Module
EtherCAT
Master
Function
Module
EtherCAT communi-
cations path
All EtherCAT
Slave Terminals
EtherCAT Slave
Terminal #1
EtherCAT
Coupler Unit
NX Unit (inputs)
NX Unit (outputs)
EtherCAT Slave
Terminal #2
EtherCAT
Coupler Unit
NX Unit (inputs)
Signal to input
terminal
NX Unit (outputs)
Signal from
output terminal
NX-series EtherCAT Coupler Unit User's Manual (W519)
Primary period Primary period
Tcycle Tcycle
Primary periodic task Primary periodic task
IO UPG MC IO UPG
Process data
Process data
communications communications
cycle
cycle
EtherCAT transmission time
EtherCAT transmission time
(Sync0)
(Sync0)
NX Unit input
synchroniza-
tion timing
Tmax-InProc
Tnx-InProc
Time lag = Tcycle
Tnx-Indelay
12 Communications Performance
Primary period
Tcycle
Primary periodic task
MC IO UPG MC
Process data
communications
cycle
EtherCAT transmission time
(Sync0)
NX Unit input
synchroniza-
tion timing
Tcycle + Edelay + Etxj
Tmax-OutTrans
Tmax-InTrans
T#1-OutTrans
T#1-InTrans
T#2-OutTrans
T#2-InTrans
I/O response time
Primary period
Tcycle
Primary periodic task
IO UPG MC
Process data
communications
cycle
EtherCAT transmission time
(Sync0)
NX Unit input
synchroniza-
tion timing
Tmax-OutProc
Tnx-OutProc
Tnx-Outdelay
12 - 3
12