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5 I/O Refreshing Methods
NX-series Position Interface Units User’s Manual (W524)
5-2 I/O Refreshing Methods
5
5-2-3 I/O Refreshing Method Operation
Synchronous Output Refreshing
• The NX Units that operate with synchronous output refreshing in a Slave Terminal update outputs at
a fixed interval based on Sync0. (Refer to figure (a) in the diagram below.)
Refer to the NX-series EtherCAT Coupler Unit User’s Manual (Cat. No. W519-E1-05 or later) for
information on the Slave Terminals that operate with the same timing when more than one Slave Ter-
minal is placed on the same EtherCAT network.
• The Communications Coupler Unit updates the values of the output during I/O refreshing. (See fol-
lowing figure (b).)
• The I/O refreshing interval changes according to the processing conditions of the Communications
Coupler Unit and host communications master (see following figure (c)), so the output refresh interval
is constant. (See following figure (d), (e).)
• The ON/OFF response time is required from when outputs are updated until the output status is set
on the external terminals of the NX Units. (See following figure (f).)
Refer to the NX-series EtherCAT Coupler Unit User’s Manual (Cat. No. W519) for details on the
operation of I/O refreshing with connections that do not use the built-in EtherCAT port on the
NJ/NX-series CPU Unit.
The Sysmac Studio automatically calculates the offset
between Sync0 and the output refresh timing.
Constant
Constant
(c) The I/O refresh interval
is not constant.
ON/OFF
response
time
Unit A
Unit B
Not constant
(d) The Sync0 interval is constant.
(e) Constant
ConstantConstant
(b) The Communications Coupler Unit updates
the values of the output during I/O refreshing.
Wait time
Wait time
I/O refreshing on
NX bus
Sync0 Sync0
Sync0
Input refreshing
Output refreshing
(a) All Output Units that operate with synchronous output
refreshing update their outputs at the same time.
(f) Output status is finalized.
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