MicroLogix1400 Tags as Null

Ignition Exchange
1

Greetings everyone,

I am quite new to Ignition, installed it only a few hours ago been playing with the trial. Trying to understand if its fits for the purpose of a project currently following. So far so good, pretty easy and powerful.

Ignition Version 8.0.8

I trying to set up basic testing, I want to read tags from a MicroLogix1400 PLC.

  1. Added the Micrologix1400 on the Ignition Gateway - status reported as "Connected: Protocol EIP
  2. Ignition Designer - browsed for device - I/O Tags.
  3. Add them to the tags list to be monitored.
  4. The I/O Tags report the following error: “[null, Bad, Tue Feb 18 09:55:37 AEDT 2020 (1581980137862)]”

I checked with the AB SW and other SW that I could connect and read those tags. Can reach the PLC, and it’s on RUN.
Notice that the I/O Tags are coming as short, tried to change the type to Bool.

What else could I try?
Apologises if this is a basic question, but I am starting I can’t sort it after reading the docs or searching on the forum.

Much Appreciated.

2

I think I was checking the wrong tags memory address group from the OPC.

However, the question I have now is it possible to read the raw I/O value from the PLC? That’s where the data was coming as null actually.

3

Make sure you reset the trial every two hours. Most drivers go to null when trial mode expires.

5

I have found the issue. The problem was the automatic browser by the Ignition was mapping the OPC Item Path as “ns=1;s=[MicroLogix1400]I:0.1”, and by the PLC memory address it should be “ns=1;s=[MicroLogix1400]I0:0/1”.
Same for the outputs!

Solved :slight_smile: