5-2-2
Setting the I/O Refreshing Methods
Setting Methods between the CPU Unit and the NX Units
How to set an I/O refreshing method between the CPU Unit and the NX Units is determined by the
connected CPU Unit.
Refer to the software user’s manual for the connected CPU Unit for information on how to set an I/O
refreshing method between the CPU Unit and the NX Units.
An example of the setting operation for the NX-series NX102 CPU Unit is shown below.
For the NX102 CPU Unit, no setting operation is required, and the method is determined according to
the following table.
NX Units that
support only
Free-Run re-
freshing
NX Units that sup-
port only syn-
chronous I/O re-
freshing
NX Units that sup-
port both Free-Run
refreshing and syn-
chronous I/O re-
freshing
NX Units that support
Free-Run refreshing, syn-
chronous I/O refreshing,
and task period priori-
tized refreshing
NX Units that
support only
time stamp re-
freshing
*1
Free-Run re-
freshing
Synchronous I/O refreshing
Time stamp re-
freshing
*1. Two types of time stamp refreshing are available: one is input refreshing with input changed time and the oth-
er is output refreshing with specified time stamp.
Because the High-speed Analog Input Units support only the synchronous I/O refreshing method, syn-
chronous I/O refreshing is always used.
Setting Methods between the Communications Coupler Unit and
the NX Units
How to set an I/O refreshing method between the Communications Coupler Unit and the NX Units is
determined by the connected Communications Coupler Unit.
Refer to the user’s manual for the connected Communications Coupler Unit for information on how to
set an I/O refreshing method between the Communications Coupler Unit and the NX Units.
An example when the EtherCAT Coupler Unit is connected to the built-in EtherCAT port on an NJ/NX-
series CPU Unit or NY-series Industrial PC is shown below.
The I/O refreshing method between the EtherCAT Coupler Unit and each NX Unit depends on whether
the DC is enabled in the EtherCAT Coupler Unit.
5 I/O Refreshing
5 - 7
NX-series Analog I/O Units User’s Manual for High-speed Analog Input Units (W592)
5-2
I/O Refreshing Methods
5
5-2-2
Setting the I/O Refreshing Methods
