Omron NX-AD series User Manual page 110

5 I/O Refreshing
Slave Terminal Operation
The following describes the operation of synchronous input refreshing of an EtherCAT Slave Termi-
nal connected to the built-in EtherCAT port.
• All Digital Input Units and Analog Input Units that operate with synchronous input refreshing in the
Slave Terminal read their inputs at the same time at a fixed interval based on Sync0. (Refer to (a)
in the figure below.)
• The Analog Input Units perform AD conversion once for each refresh cycle of the NX bus in order
to obtain the AD converted values of all inputs for which the used channels are set to enable at the
time to read inputs.
AD conversion is performed in order from the lowest channel number, so that the timing to convert
is different for each input.
• The Communications Coupler Unit reads the input values, which are read by the Unit at the timing
of reading inputs, at immediate I/O refreshing. (Refer to (b) in the figure below.)
• The interval of I/O refreshing varies with the processing conditions of the Communications Cou-
pler Unit or the host communications master. (Refer to (c) in the figure below.) The timing to read
inputs will be at a fixed interval. (Refer to (d) and (e) in the figure below.)
• The Sync0, the timing to read inputs and the maximum NX bus I/O refresh cycle of the Slave Ter-
minals are automatically calculated by the Sysmac Studio according to the input refresh cycle of
the NX Units in the Slave Terminals when the Slave Terminals are configured and set up.
*1. If multiple Slave Terminals are present on the same EtherCAT network, refer to the NX-series EtherCAT Cou-
pler Unit User's Manual (Cat. No. W519-E1-05 or later) for the range of available Slave Terminals that operate
at the same timing.
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NX-series Analog I/O Units User's Manual for Analog Input Units and Analog Output Units (W522)