8 Pulse Output Units
8 - 24
NX-series Position Interface Units User’s Manual (W524)
When a Pulse Output Unit is connected to an EtherCAT Coupler Unit, the I/O refreshing method
depends on the Enable Distributed Clock setting.
The following table lists the possible combinations.
Unit version 1.2 or later and an NX-ECC203 EtherCAT Coupler Unit are required to use task
period prioritized refreshing. If you use unit version 1.1 or earlier and an NX-ECC203 EtherCAT
Coupler Unit, operation is performed with synchronous I/O refreshing.
The following table lists the refresh cycles for synchronous I/O refreshing and task period prioritized
refreshing.
Precautions for Correct Use
If you use synchronous I/O refreshing or task period prioritized refreshing, set the task period to
a value within the specified refresh cycle range of the Position Interface Unit.
For the communications cycle specifications of the built-in EtherCAT port on an NJ/NX-series CPU
Unit, refer to the NJ/NX-series CPU Unit Built-in EtherCAT Port User's Manual (Cat. No. W505). For the
communications cycle specifications of the EtherCAT Coupler Unit, refer to the NX-series EtherCAT
Coupler Unit User’s Manual (Cat. No. W519-E1-05 or later).
8-7-1 Setting the I/O Refreshing Methods
DC enabled/disabled I/O refreshing method
Enabled (DC for synchronization) Synchronous I/O refreshing
Enabled (DC with priority in cycle time) Task period prioritized refreshing
Disabled (FreeRun) Cannot be used.
Refresh Cycle
I/O refreshing method Refresh cycle
Synchronous I/O refreshing
*1
*1. The refresh cycle depends on the specifications of the EtherCAT master and EtherCAT Coupler Unit. It also
depends on the Unit configuration.
250 μs to 10 ms
*2
*2. The range is 250 μs to 4 ms for unit version 1.1 or earlier. The range is also 250 μs to 4 ms for unit version 1.2
or later if you use the NX-ECC201/202 EtherCAT Coupler Unit.
Task period prioritized refreshing
*1
125 μs to 10 ms
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