5 I/O Refreshing
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NX-series Digital I/O Unit User’s Manual (W521)
Set the following items.
Adding to the NX Unit Configuration
Enable the distributed clock in the EtherCAT slave parameters on the EtherCAT Coupler Unit that is
added to the EtherCAT network configuration and add the NX Units that support input refreshing
with input changed time to the NX Unit configuration.
Setting the Task Period
Set the task period of the primary periodic task.
With the primary periodic task in Configurations and Setup - Task Settings, select the task period in
the Period/Execution Conditions from the list.
At this time, set the primary period to a task period in which the value that is greater than the I/O
refresh cycle of the NX bus that is calculated by the Sysmac Studio.
A warning is given if you set the primary period to a task period in which the value that is smaller
than the I/O 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) for a warning on the
task periods.
Do not disable the distributed clock. If it is disabled, the input refreshing with input changed
time will not operate correctly. However, an error does not occur even if it is disabled.
If the distributed clock is disabled, the input values reflect the actual input status, but the input
changed times retain the default values and do not change.
Editing NX Unit Operation Settings
Four-point Input Units
Settings
Setting name Description
Default
value
Unit
Input Bit 00 Trigger Setting Set the trigger to read the input changed time.
FALSE: Rising Edge
TRUE: Falling Edge
FALSE
Input Bit 01 Trigger Setting
Input Bit 02 Trigger Setting
Input Bit 03 Trigger Setting
Input Bit 00 Mode Setting Set the operation mode to read the input
changed time.
FALSE: Continuous (Last changed time)
TRUE: One-shot (First changed time)
FALSE
Input Bit 01 Mode Setting
Input Bit 02 Mode Setting
Input Bit 03 Mode Setting
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