Omron GX-AD0471, User Manual, Page: 47 / 394

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3 Basic Usage Procedures
GX-series EtherCAT Slave Unit User’s Manual
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3-3 Starting Communications
Start the system, allocate I/O data of Slave Units, and then start the EtherCAT communications.
For operational state and details of it, refer to "5-3 Communications State Transitions" in page 5 - 4.
If you use an IO-Link Master Unit, refer to the
IO-Link System User’s Manual (W570) for IO-Link
communications settings and for information on starting IO-Link communications.
Turn ON the power supply to each Unit.
(1) Unit power supply of EtherCAT Master Units
(2) Unit power supply of Slave Units (When the power is supplied, Slave Unit's [PWR] indicator is lit.)
(3) I/O power supply of Slave Units
Note that there are no restrictions on the order of turning ON the power supplies.
The following communications are performed in EtherCAT.
 PDO communications (remote I/O communications)
Allocate I/O data of Slave Units to the EtherCAT Master Unit (PDO mapping) and perform PDO
communication (remote I/O communications).
For the detailed explanation of I/O data of each Slave Unit, refer to "I/O Data Allocation (PDO
Mapping)” in Chapter 7 to Chapter 9.
Note that the ESI file are used to allocate I/O data.
For the detailed explanation of the procedure, refer to the manual of the EtherCAT Master Unit to be
used and the manual of the Configuration Tool.
 SDO communications (message communications)
For the method of using, refer to the manual of the EtherCAT Master Unit to be used.
Refer to "Appendix A - 1 Object Dictionary" for the detailed explanation of objects implemented on
GX-series EtherCAT Slave Units.
Note that the SDO communications can be used in the pre-operational state or more.
Shift to the operational state (EtherCAT communications possible) to start the EtherCAT
communications.
For how to shift to the operational state, refer to the manual of the EtherCAT Master Unit to be used.
3-3-1 Starting a System
3-3-2 Setting EtherCAT Communications
3-3-3 Starting EtherCAT Communications