OPC UA Data Access - functional scope
4
Objective of the section
This section describes the functional scope and the SINUMERIK-specific special features of
the OPC UA Data Access interface.
Note
The communication time is not guaranteed. As a consequence, realtime tasks cannot be
implemented using the OPC UA data access interface.
Detailed information on the OPC UA specification is provided on the OPC Foundation (https://
opcfoundation.org/) page.
Using the OPC UA data access interface, data can be accessed on the NC and PLC. In
particular, variables can be read and written, and you can be notified when a value changes.
You can access individual variables (e.g. /Channel/Parameter/R[u1,1]) and array variables
(e.g. /Channel/Parameter/R[u1,1,10]).
Note
Limited number of simultaneously monitored variables
The number
of variables from the "Sinumerik" object that can be monitored simultaneously is
limited:
● SINUMERIK 828D, maximum 100 variables
● SINUMERIK 840D sl, maximum 200 variables
If you attempt to monitor more variables, the "BadNodeIdUnknown" error is returned.
SINUMERIK Integrate for Engineering Access MyMachine / OPC UA
Commissioning Manual, 10/2015, 6FC5397-3DP40-5BA3 21
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