BACnet/IP positive-integer-value data type (Ignition Edge IIoT 8.3.6)

Ignition
1

In Ignition Designer when I try to poll a "positive-integer-value" point I get error Bad_NodeIdUnknown. For example OPC Item Path ns=1;s=[{DeviceName}]PositiveIntegerValue371.Present_Value

Is it as simple as Ignition Designer or Ignition Edge IIoT just doesn't support that data type? Or is there a way to make it work? I did some googling and came up empty handed. Claude says:

The “primitive value” objects added in BACnet 135-2008 are newer. That group includes IntegerValue (45), LargeAnalogValue (46), PositiveIntegerValue (48) and CharacterStringValue (40). Ignition hasn’t supported them consistently: they often don’t appear when you browse a device, even when the controller lists them in its Object_List. Edge IIoT uses the same driver as full Ignition, so it behaves the same way.

I don't know if Claude's right or where I might find official documentation on that topic...

2

That point type isn't supported, but you might be able to read a value using system.bacnet.readRaw | Ignition User Manual

Maybe something like (untested):

value = system.bacnet.readRaw(
    "DeviceName",
    system.bacnet.enumerated.ObjectType.positiveIntegerValue,
    371,
    system.bacnet.enumerated.PropertyIdentifier.presentValue
)
3

Thanks, I'll check out the readRaw approach.

Any plans to add support for it?

4

I'll let the PM know, we can probably include this in the upcoming BACnet work we're doing. Support for objects like this (as opposed to complex objects like a schedule) should be pretty trivial...

5

That would be great, I've run into a handful of these points lately that I'd love to be reading without jumping through hoops