
5 EtherCAT Communications
5 - 4
GX-series EtherCAT Slave Unit User’s Manual
5-3
Communications State Transitions
The EtherCAT State Machine (ESM) indicates the state transition model of EtherCAT Slave Unit
communications control. It is controlled by EtherCAT Master Unit.
The following figure shows the communications state transitions from power ON.
State
SDO
communi
cations
PDO
transmiss
ion
PDO
reception
Contents
Initialization (Init)
Not
possible.
Not
possible.
Not
possible.
Communications are being initialized.
Communications are not possible.
Pre-Operational
(Pre-Op)
Possible
Not
possible.
Not
possible.
SDO (message) communications are
possible in this state.
This state is entered after initialization has
been completed. It is used to initialize
network settings.
Safe-Operational
(Safe-Op)
Possible
Possible
Not
possible.
In this state, PDO transmissions are possible
in addition to SDO (message)
communications.
PDO sendings can be used to send
information such as status from the Slave
Unit.
Operational (Op)
Possible
Possible
Possible
Normal communication state
PDO communications can be used to control
the I/O data.
Initialization
Pre-Operational
Safe-Operational
Operational
Power ON
Содержание GX-AD0471
Страница 3: ...GX series EtherCAT Slave Units User s Manual Revised October 2018...
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Страница 34: ...1 EtherCAT Network 1 8 GX series EtherCAT Slave Unit User s Manual Separate from Unit power supply when wiring...
Страница 42: ...2 EtherCAT Slave Unit 2 8 GX series EtherCAT Slave Unit User s Manual...
Страница 66: ...4 Installation and Wiring 4 18 GX series EtherCAT Slave Unit User s Manual...
Страница 84: ...5 EtherCAT Communications 5 18 GX series EtherCAT Slave Unit User s Manual...
Страница 98: ...6 Basic Specifications of Slave Units 6 14 GX series EtherCAT Slave Unit User s Manual...
Страница 178: ...7 Digital I O Slave Unit 7 80 GX series EtherCAT Slave Unit User s Manual...
Страница 206: ...8 Analog I O Slave Unit 8 28 GX series EtherCAT Slave Unit User s Manual...
Страница 280: ...11 Expansion Unit 11 20 GX series EtherCAT Slave Unit User s Manual...
Страница 388: ...A Appendix A 84 GX series EtherCAT Slave Unit User s Manual...
Страница 392: ...Revision 2 GX series EtherCAT Slave Unit User s Manual...
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