OPC Tag (Float Array) not supporting PLC Tag (Real[10])

Ignition
1

Hi All,

The tag I have created for a PLC tag that is REAL[10] is not working, it only works when I use

ns=1;s=[TOPIC]ARRAY_NAME[i] as the item path. If I use ns=1;s=[TOPIC]ARRAY_NAME (without indexing an array element), I will get this Quality error:

“Error_Configuration("Bad_AttributeIdInvalid: The attribute is not supported for the specified Node.")”

It looks like Ignition is not recognizing the array as an OPC node, because the item path seems fine.

Screenshots:

Float Array Tag in Ignition (DOESN’T WORK):

image
image1126×522 33.8 KB

image
image272×257 7.62 KB

Item Path copied from OPC Browser: ns=1;s=[FMS_PLC_03_00A]B100_MTCW_CT_STOPsp

Error:

image
image1155×439 34.3 KB

Float Array Tag in Ignition but indexing an element (WORKS):

image
image1127×518 33 KB

image
image1184×449 30.6 KB

Item Path used: ns=1;s=[FMS_PLC_03_00A]B100_MTCW_CT_STOPsp[0]

I might be missing something. Thank you in advanced for your help!

Danny

2

Many of the older Ignition drivers expose arrays as a folder containing a tag per element. You can’t address the array itself in these drivers.

3

Hi Kevin, thank you for the explanation. Can this be fixed by updating Ignition, the drivers, both, or there is no solution for this?

4

No, it’s just not a functionality those drivers have.

What’s your use case? Array support in Ignition tags is weak and there is no performance gain at the driver level either way - it reads the array not individual tags at that level.