Synchronous Output Refreshing - Omron NX-ID User Manual

5 I/O Refreshing
Settings
Add NX Units that support synchronous I/O refreshing to the CPU Unit configuration or Slave Terminal
configuration.
After you add the NX Units, set an I/O refreshing method depending on the connected CPU Unit or
Communications Coupler Unit so that these NX Units operate with synchronous I/O refreshing.
Refer to 5-2-2 Setting the I/O Refreshing Methods on page 5-7 for information on how to set an I/O
refreshing method.
5-2-6

Synchronous Output Refreshing

The I/O refreshing method described below. Among Slave Terminals, this refreshing method is
supported only by EtherCAT Slave Terminals.
• The timing to refresh outputs is synchronized on a fixed interval between more than one NX Unit con-
nected to a CPU Unit.
• The timing to reresh outputs is synchronized on a fixed interval between more than one NX Unit on
more than one Slave Terminal.
This method is used when the problem such as input timing jitter or offset of timing to refresh outputs
between more than one NX Unit happens.
Description of Operation
CPU Unit Operation
The following describes the operation of synchronous output refreshing between the NX-series
NX1P2 CPU Unit and the NX Units.
• All Digital Output Units and Analog Output Units that are connected to the CPU Units and operate
with synchronous output refreshing refresh their outputs at the same time at a fixed interval based
on the synchronization timing. (Refer to (a) in the figure below.)
• The CPU Unit refreshes the output values at I/O refreshing. (Refer to (b) in the figure below.)
• The interval of I/O refreshing varies with the processing conditions of the CPU Unit. (Refer to (c) in
the figure below.) The timing to refresh outputs will be at a fixed interval. (Refer to (d) and (e) in
the figure below.)
• The timing of refreshing outputs, the synchronization timing, and the maximum NX bus I/O refresh
cycle are automatically calculated by the Sysmac Studio according to the output refresh cycles of
the NX Units on the CPU Unit when a Unit Configuration in the CPU Unit is created and set up.
• The ON/OFF response time is needed from the timing to refresh outputs until setting the output
status of external terminals on the NX Units. (Refer to (f) in the figure below.)
5 - 16
NX-series Digital I/O Unit User's Manual (W521)