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5 I/O Refreshing
NX-series Digital I/O Unit User’s Manual (W521)
5-2 I/O Refreshing Methods
5
5-2-6 Synchronous Output Refreshing
With this I/O refreshing method, the timing to refresh outputs is synchronized on a fixed interval
between more than one NX Unit on the 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.
• This method is used when you connect the NX Units that support synchronous I/O refreshing to the
EtherCAT Coupler Unit, that is connected to the built-in EtherCAT port on the NJ-series CPU Unit.
• All Digital Output Units and Analog Output Units that operate with synchronous output refreshing in
the Slave Terminal refresh their outputs at the same time at a fixed interval based on Sync0. (Refer to
(a) in the figure below.)
• The Communication Coupler 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 Communications Coupler
Unit or the host communications master. (Refer to (c) in the figure below.) The timing to refresh out-
puts will be at a fixed interval. (Refer to (d) in the figure below.)
• The Sync0, the timing to refresh outputs and the maximum NX bus I/O refresh cycle of the Slave Ter-
minals are automatically calculated by the Sysmac Studio according to the output refresh cycle of the
NX Units in the Slave Terminals when the Slave Terminals are configured and set up.
• The ON/OFF response time is needed from the timing to refresh outputs until setting the output sta-
tus of external terminals on the NX Units. (Refer to (e) in the figure below.)
5-2-6 Synchronous Output Refreshing
Description of Operation
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