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5 I/O Refreshing Methods
NX-series Position Interface Units User’s Manual (W524)
5-2 I/O Refreshing Methods
5
5-2-3 I/O Refreshing Method Operation
The NX Units that use synchronous I/O refreshing in an EtherCAT Slave Terminal receive inputs at a
set fixed interval based on the synchronization timing. Outputs are also refreshed simultaneously, but at
a separately set timing from inputs.
Refer to the NX-series EtherCAT Coupler Unit User’s Manual (Cat. No. W519-E1-05 or later) for infor-
mation on the Slave Terminals that operate with the same timing when more than one Slave Terminal is
placed on the same EtherCAT network.
The refresh cycle of the NX bus is automatically calculated by the Sysmac Studio based on the I/O
refresh cycles of the NX Units when the Slave Terminal configuration is set.
If an EtherCAT Slave Terminal is connected to the built-in EtherCAT port on an NX-series CPU Unit, the
NX bus refresh cycle is automatically calculated by the Sysmac Studio for each periodic task. They are
calculated for the primary periodic task and priority-5 periodic task.
For the built-in EtherCAT port on an NJ-series CPU Units, they are calculated for the primary periodic
task.
Precautions for Correct Use
• The NX bus refresh cycle is automatically set to agree with the task period of the primary
period task or priority-5 periodic task, but the task period is not set automatically. Set the task
period to a value that is greater than the refresh cycle of the NX bus that is calculated by the
Sysmac Studio.
Refer to the NX-series EtherCAT Coupler Unit User’s Manual (Cat. No. W519-E1-05 or later)
for information on setting the task periods of periodic tasks.
• The EtherCAT Slave Terminals with enabled distributed clocks and all EtherCAT slaves that
support DC synchronization execute I/O processing based on Sync0, which is shared on the
EtherCAT network. However, because the specifications and performance for the timing to
read inputs or to refresh outputs for EtherCAT slaves and NX Units are different, the timing to
read inputs or to refresh outputs is not simultaneous between the EtherCAT slaves and the
NX Units.
Refer to the manuals for the EtherCAT slaves for information on the timing to read inputs or
to refresh outputs in EtherCAT slaves.
Operation of Synchronous I/O Refreshing
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