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Term
Abbre-
viation
Description
Pre-Operational
---
A state in which NX message communications are possible between
the communications master and the Communications Coupler Unit or
NX Units, but I/O refresh communications are not possible.
process data
---
Collection of application objects designated to be transferred cyclically
or acyclically for the purpose of measurement and control.
process data object
PDO
A structure that describes the mappings of parameters that have one or
more process data entities.
process data communications
---
One type of EtherCAT communications in which process data objects
(PDOs) are used to exchange information cyclically and in realtime.
This is also called PDO communications.
Terminology
37
NX-series Analog I/O Units User’s Manual for High-speed Analog Input Units (W592)