9 Setting Up Slave Terminals
9 - 42
NX-series EtherCAT Coupler Unit User’s Manual (W519)
For example, if the _sNXUNIT_ID variable
NXUnitC
is assigned to NX Unit C in the above figure, the
program would not need to be corrected even if the Unit configuration changed as long as the array
subscript is specified with
NxReg[NXUnitC.UnitNo]
.
For information on how to register variables to assign to Units and how to assign variables, refer to the
NJ-series CPU Unit Software User’s Manual
(Cat. No. W501-E1-06 or later).
Additional Information
NX Unit Mounting Settings
If an NX Unit is removed or if you know in advance that an NX Unit is planned to be added, you
can use the NX Unit mounting settings to prevent the NX Unit numbers from changing.
Refer to
11-2 NX Unit Mounting Settings
on page 11-5 for details on the NX Unit mounting set-
tings.
When you use synchronous I/O refreshing, the refresh cycle on all other Slave Terminals will increase
when the refresh cycle for any one Slave Terminal increases.
The refresh cycle of a Slave Terminal increases in the following cases.
• If you add an NX Unit with a long refresh cycle to a Slave Terminal, the synchronous I/O refresh cycle
will greatly depend on the refresh cycle of that NX Unit.
• If the number of NX Units mounted to a Slave Terminal increases, the amount of data communica-
tions increases and the communications path within the Slave Terminal becomes longer. Therefore,
the cycle that enables synchronization of I/O becomes longer.
To eliminate the influence of the refresh cycles between NX Units on a Slave Terminal and between
Slave Terminals, use Free-Run Mode to operate all Slave Terminals that do not require synchronous
I/O refreshing.
Additional Information
• Refer to
10-3-2 Setting the I/O Refreshing Methods
on page 10-6 for the setting procedure of
the I/O refreshing method.
• With synchronous I/O refreshing, the same refresh cycle is used between the NX Units on
the same Slave Terminal and between NX Units on different Slave Terminals.
Therefore, the synchronous I/O refresh cycle depends on the refresh cycle of the NX Unit
with the longest refresh cycle of all of the NX Units that use synchronous I/O refreshing.
9-6-2
Synchronous I/O Refresh 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: ......