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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
Output Prioritized Refreshing
• Output processing is started on Sync0. (See following figure (a).)
• The Communications Coupler Unit updates the values of the output during I/O refreshing. (See
following figure (b).)
• The I/O refreshing interval changes according to the processing conditions of the Communica-
tions Coupler Unit and host communications master (see following figure (c)). Output processing
is started on Sync0. (See following figure (a).)
• Because output processing is given priority, input processing is performed after output processing
is completed. Therefore, input refreshing for the data that results from input processing is per-
formed by the Communications Coupler Unit in the next cycle after the cycle in which output pro-
cessing is performed. (See following figure (d).)
*1. The timing of I/O is given as an example. The actual timing will vary.
Refer to the NX-series EtherCAT Coupler Unit User’s Manual (Cat. No. W519-E1-05 or later)
for details on the operation of I/O refreshing with connections that do not use the built-in Ether-
CAT port on the NJ/NX-series CPU Unit.
Sync0 Sync0
The Sysmac Studio automatically calculates the offset
between Sync0 and the output refresh timing.
Sync0
ConstantConstant
(c) The I/O refresh interval is not constant.
ON/OFF
response time
Not constant
The Sync0 interval is constant.
Constant
I/O refreshing on
NX bus
Input refreshing
Output refreshing
Output status is finalized.
Unit A with synchronous
I/O refreshing
Unit B with synchronous
I/O refreshing
Pulse Output Unit
*1
Input
Wait time
Wait time Wait time
Wait time
Constant
(a) Output processing
is started on
Sync0.
(b) The Communications Coupler Unit updates the
values of the output during I/O refreshing.
(d) Input refreshing is performed
with a one-cycle delay.
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