5 I/O Refreshing
5 - 4
NX-series Analog I/O Units User’s Manual for Analog Input Units and Analog Output Units (W522)
The following shows the operation of I/O refreshing when the built-in EtherCAT port on the NX-series
CPU Unit is used for communications with an EtherCAT Slave Terminal.
• The process data communications cycle in item (b) and the refresh cycle of the NX bus in item (c) are
automatically synchronized with the primary period or the task period of the priority-5 periodic task of
the CPU Unit in item (a).
*1
• The refresh cycle of each NX Unit in item (d) depends on the I/O refreshing method which is given
below.
*1. This applies when the distributed clock is enabled in the EtherCAT Coupler Unit.
The priority-5 periodic task must be supported by the connected CPU Unit model. Refer to the
NJ/NX-series CPU Unit Software User's Manual (Cat. No. W501-E1-16 or later) for the periodic tasks
supported by each model of NX-series CPU Unit.
The following shows the operation of I/O refreshing when the built-in EtherCAT port on the NJ-series
CPU Unit or NY-series Industrial PC is used for communications with an EtherCAT Slave Terminal.
• The process data communications cycle in item (b) and the refresh cycle of the NX bus in item (c)
*1
are automatically synchronized with the primary period of the CPU Unit or Industrial PC in item (a).
• The refresh cycle of each NX Unit in item (d) depends on the I/O refreshing method which is given
below.
*1. This applies when the distributed clock is enabled in the EtherCAT Coupler Unit.
Refer to the NX-series EtherCAT Coupler Unit User's Manual (Cat. No. W519-E1-08 or later) for
detailed information on I/O refreshing between the built-in EtherCAT port and EtherCAT Slave Termi-
nals.
In addition, refer to the user's manual for the connected Communications Coupler Unit for the I/O
response times of NX Units on Slave Terminals.
Operation of I/O Refreshing with NX-series CPU Units
Operation of I/O Refreshing with NJ-series CPU Units or NY-series
Industrial PCs
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