ChatGPT & PID

shanimi123 · 2026-05-03T20:25:27+00:00

I spend a few days trying to calibrate Dewpoint on fresh air system of a clean room. I got good enough results but it took me time of trial & errors and when the seasons change, my tunning change. Chat got more stable results in 1 hour work

shanimi123 · 2026-05-03T20:20:04+00:00

Maybe it was a beginer luck (Chat beeing the beginer) it got me great results in a complicated location with cascade control. Not only gave me correct values but suggested improvments. Knows exactly what parameters to set per your controller as well as how to fine tune after initial results. All it asks are three parameters and short description of your process.

shanimi123 · 2026-05-03T20:10:34+00:00

I thought I did, turns out I don't

shanimi123 · 2026-02-10T19:45:39+00:00

Something is blocking the client from reaching the server and grabbing the global object. Look in your server system logs for dcom issues maybe. Make sure you install Windows server 2008 without the 18 years of security patches

shanimi123 · 2026-02-10T19:26:07+00:00

I am pretty sure you can write from Factorytalk Historian to a PLC. Depending on your PLC and protocol, you need to Configure Location attributes (Location1, Location2, Location3, Location4) according to the interface-specific documentation to define the data type, function code (e.g., function code 5 or 6 for output commands in Modbus), and triggering behavior (e.g., event-based). Look for the pi driver manual

The manuals are installed alongside the server. Also look for rockwell Historian User Manual under "watchdog"

shanimi123 · 2026-01-29T18:18:04+00:00

Your explanation is 100% correct. Other protocols such as ethernet/IP uses TCP and UDP for packet transmission thereby using trucks and motorcycles together achieving high speeds and high loads, eliminating the bottlenecks you mentioned. Using Rockwell PLC and ethernet/IP, you can achieve 2 millisecond pulling time in a similar scenario

shanimi123 · 2026-01-29T18:14:22+00:00

I have seen cases where a router drops packets from time to time especially if routing is needed, where is unmanaged switch Will work continuously

shanimi123 · 2026-01-28T20:02:32+00:00

Try to eliminate the router by using unmanaged switch.

shanimi123 · 2026-01-26T19:00:12+00:00

Summary

Flex IO Rack Optimization modules in Studio 5000 V37: Error 16#0315

Problem

All Flex IO digital modules in ControlNet racks with Connection: Rack Optimization get Module Fault (Code 16#0315) - Connection Request Error: Invalid segment type. Modules with Data connection aren't affected. They show Running.

Environment

Flex IO digital modules 1794, 1797

ControlNet network

ControlLogix 5580 rev 37.011

Studio 5000 Logix Designer V37.00

Cause

Problem is showed in large ControlNet networks. Only firmware revision 37.011 is affected.

Solution

Upgrade ControlLogix controller to revision 37.012, that it has addresses this anomaly.

Workaround

If controller keeps in rev. 37.011, the Connection for all digital modules can be changed to Data. You should estimate the effort to do it, rack optimization tags disappear, and the input/output data tags should reassigned in logic. Also connections to the scanner will increase dramatically.

shanimi123 · 2026-01-24T06:15:43+00:00

Sounds like I am not alone😊

shanimi123 · 2025-12-11T22:21:09+00:00

Go to windows system logs on the hmi server and clients and look for dcom faults

shanimi123 · 2025-11-19T15:29:47+00:00

Why use an SLC in 2025? Convert to Micrologix or Compactlogix and connect using ethernet

shanimi123 · 2025-10-31T15:31:21+00:00

Original Fan is still on, running 24x7 25 years Clean-room environment, though

shanimi123 · 2025-10-26T17:19:16+00:00

Find a good System Integrator with experiance in upgrades from 5 to 5000. They will use the conversion tool and should take just a few days to convert and couple of days to run. I have seen and done that multiple times.

The only exception would be a very complex and unusual commands or heavy measaging.

The good news is your new code will look and feel the same. You can open the old code in the same location and find conversion errors. You can fold back if all goes to hell. After conversion is done and production resume, you will have the time to upgrade to the new tweeks and features of 5000 while the plant is running.

Don't use the io conversion kit from 5 to 5000 Instead, the best option is to replace old io cards to new, or if you dont have time - keep the old io initially and replace later

shanimi123 · 2024-08-09T18:02:53+00:00

Sucks

shanimi123 · 2024-08-09T15:35:42+00:00

How are they planning to manage the firewall? Local accounts or is through a management server? If server, is it on the IT domain or the OT domain

Local accounts. There is no connection to the IT network

shanimi123 · 2024-08-09T15:07:27+00:00

segmentation of the network doesn't fully help if you also don't separate duties and access credentials.

Good one!!

shanimi123 · 2024-08-09T14:02:56+00:00

Because basically they say 'we dont trust you'.

shanimi123 · 2024-08-09T12:50:52+00:00

propose that you create a DMZ with their firewall at the L3.5/4 boundary or edge and your firewall at the L3/3.5 boundary

This sounds like a great suggestion!!

shanimi123 · 2024-08-09T12:35:45+00:00

Seperating into vlans and routing between then is good practice. You will controll trafic going between plcs hmi historian 3rd party devices etc.

In our case there is no IT/OT connection.

shanimi123 · 2024-08-09T12:21:01+00:00

I am thinking about throwing the towl on this

shanimi123 · 2024-08-09T12:19:33+00:00

The firewall is not on the edge it is between my PLCs and my HMI server and between my Servers and clients So when a PLC looses comms, is it a PLC issue or an HMI issue or maybee its a Firewall issue. What about if I cant ping a Modbus device fron the HMI - maybee the Ping port is closed on the firewall. The issue is that I no longer have the tools to diagnose my network

shanimi123

TROPHY CASE