Get values from array on node? (only get first value)

[KenSense]

This node works
node = client.get_node(ua.NodeId('/Channel/Parameter/R', 2))
When I ask the value I only get the first value of an array. var = await node.get_value()

According to the machine documentation I should request it with this address:
'/Channel/Parameter/R[u1,1]' or even as array of 10 parameters '/Channel/Parameter/R[u1,1,10]'
Page 47 https://cache.industry.siemens.com/dl/files/318/109760318/att_960876/v1/840Dsl_OPCUA_commiss_man_0818_en-US.pdf

But /Channel/Parameter/R[u1,1] as node will always give me:
_asyncua.ua.uaerrors.auto.BadNodeIdInvalid: "The syntax of the node id is not valid."

So how can I access this data or does this library not support this?

Thanks

[AndreasHeine]

"asyncua.ua.uaerrors.auto.BadNodeIdInvalid" is a response from the opc ua server (siemens)!

[AndreasHeine]

can you post a screenshot from UA Expert like in the docs
->
5.3 Variable access
5.3.1 Variable paths for NC access operations

[AndreasHeine]

5.2 Address space model
Address space model
If the OPC UA server is browsed, the available address space is mapped under the "Sinumerik"
node.
Global User Data (GUD) can be found under the "/Sinumerik/GUD" node.
The PLC blocks (inputs, outputs, bit memory, data blocks) can be found under the "/Sinumerik/
Plc" node.
Machine data can be found under the node "/Sinumerik/TEA".
Setting data can be found under the node "/Sinumerik/SEA".
Observe the following while browsing:
● In the address space of the NC, the displayed variables always represent only the first
parameter of the corresponding unit.
Example:
The R parameters can be found under "Sinumerik > Channel > Parameter > R". The
corresponding identifier is called "/Channel/Parameter/R", which is finally mapped to "/
Channel/Parameter/R[u1, 1]". If you want to access other parameters, you need to specify
the corresponding index in brackets, e. g. "/Channel/Parameter/R[u2,56]".
● In the address space of the PLC, the displayed variables represent the access format that
has to be extended accordingly.
Example:
The variable "/Plc/MB" is in the address space and is mapped to "/Plc/MB0". For accessing
further bytes this variable must be extended by the appropriate byte number, e.g. "/Plc/
MB6".
● The address space of the NC also contains variables that are not available in a
corresponding machine configuration. These variables return "BadAttributeIdInvalid" as
value.

from that i would guess it does not exist in the opc ua servers addressspace!

[KenSense]

It does show that there is no type provided for all nodes, not sure if that's ok

[KenSense]

So you think the server isn't working as it is documented?

[AndreasHeine]

hm it (R) has no TypeDefinition Reference and no DataType Attribute ??? this is weird!

[AndreasHeine]

what is underneath R if you unfold?

[KenSense]

what is underneath R if you unfold?

Nothing R is the end

[KenSense]

Problem solved, the SINUMERIK OPC UA server on the machine needed a software update. (bug fix)