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8 EtherCAT Communications
8 - 10
NX-series EtherCAT Coupler Unit User’s Manual (W519)
8-6
Communications between an Ether-
CAT Master and Slaves
This section describes the communications modes between the master and slaves for EtherCAT com-
munications, and the communications modes for EtherCAT Slave Terminals.
In this mode, the slave processes the I/O (i.e., refreshes the I/O data) asynchronous to the communica-
tions cycle of the master.
In this mode, the slave processes the I/O (i.e., refreshes the I/O data) in synchronization with the com-
munications cycle of the master. In this mode, a mechanism called a distributed clock (DC) is used to
synchronize EtherCAT communications. The clock is shared by the master and the slaves. In DC
Mode, the master and slaves are synchronized by sharing the same clock. Interruptions to synchronize
timing are generated in the slaves at precise intervals based on this clock. Interruptions (Sync0) are
generated in the slaves at precise intervals based on this clock. Each slave executes I/O processing at
this precise time.
EtherCAT Slave Terminals support the following two communications modes.
• Free-Run Mode
• DC Mode
for information on the operation of an EtherCAT Slave Terminal in
different communications modes.
The communications cycle is determined by the setting for it in the EtherCAT master.
3-1-2 EtherCAT Coupler Unit Specifications
on page 3-2 for the DC Mode communications
cycles that are supported by the EtherCAT Slave Terminals. There are no specific restrictions for the
Free-Run Mode communications cycles that are supported by the EtherCAT Slave Terminals.
Refer to the
NJ-series CPU Unit Built-in EtherCAT Port User’s Manual
(Cat. No. W505) for the commu-
nications cycles that are supported by the built-in EtherCAT ports on NJ-series CPU Units.
8-6-1
Communications Modes for Communications between an Ether-
CAT Master and Slaves
Free-Run Mode
DC Mode
8-6-2
Communications Modes for EtherCAT Slave Terminals
8-6-3
Communications Cycle
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: ......