Ignition 8.1 - Allen bradley - How to write OPC Item Path

Ignition
1

I need to communicate an Ignition 8.1.47 with an Allen Bradley PLC through a device (PLC3) of type Allen-Bradley Logix Driver.

The thing is, I'm not clear on how to fill in the OPC ItemPath field in order to communicate with the memory addresses. For example, the boolean B9:15/6.
I tried with ns=1;s=[PLC3]B9:15/6 but it gives me a Configuration Error.

How should I fill in the OPC Item path to reach the signal?

2

The AB Logix driver is for ControlLogix and CompactLogix devices only, and only for relatively modern firmware.

There is no IA driver for the ancient PLC3 family. The PLC5 driver might work.

Please share the precise model and version of your PLC.

3

This is the PLC model: 5069-L320ER CompactLogix, 5380 Controler

image
image811Ă—483 118 KB

I have an Allen-Bradley Logix Driver called PLC3 in Ignition, and its connection status is "Connected",.

4

This is a fairly new CompactLogix, which uses tag names like “motor_start” and “motor_running”

An address like B9:15/6 is used for legacy PLC5 and SLC500 controllers, not CompactLogix.

Can you browse the PLC tags with the Ignition tag browser?

5

Use the tag browser. You can do this multiple ways.

image
image197Ă—210 7.75 KB

Then from that window you can expand your PLCs to get down to the tags like so

image
image247Ă—148 3.92 KB

Or from the tag creation window. Create an opc tag and browse devices by clicking the icon on the right side of the OPC Item Path box

image
image648Ă—310 22.4 KB

6

Be aware that when a legacy AB PLC (PLC2,3,5, SLC500) is converted to modern Logix, the files' type & number become a Logix tag name, and the data is structured similarly, but the syntax within the modern conversion changes. B9:15/6 will becomes B9[15].6, using square brackets for array subscripts, and a dot before a bit number. The forward slash is not valid as a bit delimiter in modern Logix. Nor can you use the colon for the array subscript.

7

That's exactly what I needed.
Thank you so much!