Ignition & Logix Best Practice Tips for better communications

[pturmel]

@A_Power

in which multiple connections are recommended

I've had success with the legacy ControlLogix doing so. Was helpful with an Omron NJ processor more recently.

@A_Power

site standard code and UDTs

If you are referring to the bombshell in this topic, then yes:

Cannot read some tags inside Rockwell AOI

What Mike said, but also: Don’t. All AOI’s have EnableIn and EnableOut booleans that are locked to “Hidden” and therefore prevent most optimization of the data traffic to read instances of these data types. Ignition’s Logix driver cannot do bulk reads on AOIs. Do very much of this and your Logix driver will choke. I strongly recommend that any AOI you design yourself use one or more InOut parameters of another data type, with instances of those datatypes elsewhere. Place all of your extern…

If you are going to be changing things in the PLC, you might also consider switching your fastest tag group (or part of it) to "Class 1" Ethernet/IP. This module was created to deal with large numbers of tags at a 100ms pace:

Snappy user interfaces with the Ethernet/IP Module

Automation Professionals Ethernet/IP Class1 Communications Module has been in beta for a few months with no recent issues. A release to production use is approaching soon and I thought I’d share a test project and its matching PLC code I’ve been using to exercise the module’s base features. In the simplest setup, this driver presents a virtual I/O chassis to to the outside world, populated with up to 100 virtual I/O modules – I/O modules that also appear to be ControlLogix processors with user…

{ /Shameless plug. }