8 EtherCAT Communications
8 - 4
NX-series EtherCAT Coupler Unit User’s Manual (W519)
8-3
Transitions of Communications
States
The state transition model for communications control of the EtherCAT Slave Terminals is controlled by
the EtherCAT master.
The following figure shows the communications state transitions from when the power supply is turned
ON.
Status
SDO com-
munica-
tions
Sending
PDOs
Receiving
PDOs
Description
Init
Not possi-
ble.
Not possi-
ble.
Not possible. Communications are being initialized. Communi-
cations are not possible.
Pre-Operational
Possible.
Not possi-
ble.
Not possible. Only SDO communications (message communi-
cations) are possible in this state.
This state is entered after initialization is com-
pleted. It is used to initialize network settings.
Safe-Operational
Possible.
Possible.
Not possible. In this state, both SDO communications (mes-
sage communications) and sending PDOs are
possible.
Information, such as status, is sent from the
Slave Terminal.
Operational
Possible.
Possible.
Possible.
This is the normal state for communications.
PDO communications are used to control the I/O
data.
Init
Pre-Operational
Safe-Operational
Operational
Power supply ON
Summary of Contents for NX-ECC201
Page 38: ...Sections in this Manual 36 NX series EtherCAT Coupler Unit User s Manual W519...
Page 46: ...1 EtherCAT Networks 1 8 NX series EtherCAT Coupler Unit User s Manual W519...
Page 56: ...2 Features and System Configuration 2 10 NX series EtherCAT Coupler Unit User s Manual W519...
Page 82: ...4 Part Names and Functions 4 14 NX series EtherCAT Coupler Unit User s Manual W519...
Page 100: ...5 Designing the Power Supply System 5 18 NX series EtherCAT Coupler Unit User s Manual W519...
Page 214: ...9 Setting Up Slave Terminals 9 44 NX series EtherCAT Coupler Unit User s Manual W519...
Page 254: ...11 EtherCAT Coupler Unit Functions 11 30 NX series EtherCAT Coupler Unit User s Manual W519...
Page 278: ...12 Communications Performance 12 24 NX series EtherCAT Coupler Unit User s Manual W519...
Page 340: ...14 Maintenance and Inspection 14 8 NX series EtherCAT Coupler Unit User s Manual W519...
Page 400: ...Appendices A 60 NX series EtherCAT Coupler Unit User s Manual W519...
Page 401: ...Index 1 NX series EtherCAT Coupler Unit User s Manual W519 I Index...
Page 405: ......