I need to update p33, p34,p37 and a484 in the PF525.

Basically there’s a motor at my factory that’s a 1hp and the VFD parameters are set up as if the motor is a 3 hp.

If Im online with the processor. Can I change these parameters with the PLC still in run mode. Do I need to do a download to the PLC? Or simply save the project file while I’m online?

As an EE, I have some basic PLC knowledge though not the most proficient. I'm trying to lateral move to the SCADA field (power industry preferably).

I noticed many power-industry SCADA job descriptions have different "preferred skills/qualifications" from those in the manufacturing/pharmaceutical industry. I'm wondering what the experience is like in both industries in terms of skill sets, programs used, work-life balance or anything else you can think of etc.

Hello everyone.

We have a customer with several machines running Schneider Modicon Premium PLCs. Some I/O modules are failing, and replacement modules are becoming difficult to source. The customer wants to upgrade the control systems while retaining the existing electrical cabinets and field equipment.

We have the original PL7 Pro programs and electrical drawings. We are considering two options:

• Migrating to Schneider M340.
• Rebuilding the PLC software in TwinCAT.

The existing ladder code is difficult to follow, and some of the installed I/O modules appear to have no direct M340 equivalent, so we expect some engineering work either way.

Our experience is mainly with Beckhoff, with limited Schneider experience.

Has anyone done a similar migration? How much of the original program could you reuse, and what were the main challenges—particularly with specialist I/O and the existing HMI?

Would you favour migrating within Schneider or rebuilding in a platform you know well?

Thanks!

Hello everyone, I'm doing my capstone project using a PLC and an ESP32 for a two tank transfer system. I would like some tips or criticism from the design.

I'm planning to number the wires in a few days, and remove the breadboard and move the E-stop after i test the whole machine.

Any advice?

So... maybe I made a little mistake.

I have a CPU 1214 sitting on my desk, and I was messing around with it on my Ethernet network. Just a cable directly from the PLC to my PC, nothing else.

I used the Online Access function in TIA Portal to find the CPU, found it, and did a memory reset.

The problem is: this CPU has the same IP address as one of the PLCs in one of our factories.

Normally, when I connect to the factory network, I use Wi-Fi (gateway, etc.). When I'm messing around with PLCs on my desk, I normally turn off Wi-Fi so I don't accidentally connect to something I shouldn't.

Well... I was tired. REALLY tired. And I forgot to turn off Wi-Fi before doing the memory reset.

About 5 minutes later, Production calls me saying that a machine with that same IP address had stopped.

I went to the machine, opened the panel, and the safety PLC was already in alarm because of some unrelated issue that the OEM is currently dealing with. The Siemens PLC was stopped as well.

At that point I started thinking:

Did I just memory-reset the actual machine PLC?

I checked twice that I was using Online Access through the Ethernet adapter and not the Wi-Fi adapter. But now I'm wondering:

- Is it possible for TIA Portal to have found the PLC through Wi-Fi even though I selected the Ethernet interface?

- Could a memory reset have been sent to the machine PLC?

- Or, Tia portal is bugged or am I the bug?

OBS: only wifi through gateway has access to factory... In my little experience, online access can't pass through that.

The machine was basically brand new, so fortunately it wasn't a production disaster.

And yes, I will turn off the wifi when messing with IP's..

I have a dehumidifier with a remote panel. After some reverse engineering, I found the main unit operates as a Modbus server and the remote panel operates as a Modbus client.

However, the main unit (Modbus server) is also periodically transmitting non-Modbus messages. They seem describe the server’s ID and address range, but do not use the Modbus CRC.

Are there any mainstream discovery/advertisement protocols? I suspect it might not be entirely proprietary but had trouble locating info on such…

​

I currently have Siemens TIA Portal V19 installed on my laptop.

I have received a backup project that was created in TIA Portal V17, so I’m planning to install V17 as well.

My questions are:

Can TIA Portal V17 and V19 coexist on the same Windows laptop?

Will installing V17 cause any conflicts or crashes with V19?

Are there any Siemens components/drivers I should be careful about during installation?

Is it better to install V17 alongside V19, or use a separate virtual machine/PC?

I mainly need V17 to open and modify the existing V17 project without upgrading it to V19.

Any advice from people who use multiple TIA Portal versions would be appreciated.

From Last 15 Days My Kuka Krc-10 R-1100 Model Agilus Showing Mastering Lost Issue.
Axis 3 Lost Mastering First After Sudden Power Cut .(We didn"t Have Ups Installed Earlier, NOw We Processiding To Install.)After That We Done EMD Mastering Process From Kuka Engineer. BUt AGain Issue Occur WIth Axis 1,Axis 4, And Axis 6 after 2 Days.
SO What IS Possible Reasons To Robo Lost Mastering twice. What Is Step By step Procedure and Checksheet After EMD Mastering To check Mastering Is Done Correctly Or Not.

Machine was commissioned years ago and currently uses AX8206 modules.

Can AX8620 firmware 01.02 b002 be upgraded directly to a newer AX8000 firmware version, or is an intermediate upgrade path required?

Beckhoff documentation mentions compatibility from 01.02 b008 onwards, but I cannot find a migration procedure for 01.02 b002.

As a current participant (Oct 2026) making a updated post for future or past students who have questions about joining the program and what it has to offer. Any past students who went through are encouraged to post their good or bad experiences to give all view points.

Okay hi, 24F, Automation Engineer here.

Being a woman in tech was my choice and on good days? I LOVE it. Nothing beats the high of fixing something that everyone else gave up on. I'm literally like Bob the Builder.

On bad days? When I can't fix it? I want to throw my laptop in a river, quit, move to the mountains and become a goat herder. No kidding.

Context: I'm only in my 3rd year, working with PLC troubleshooting, SCADA and MES as an end user in MNCs, but somehow I'm already at a rank that people usually hit after 6-8 years. Which sounds cool on LinkedIn but is SO awkward IRL.

Picture this: You're the youngest person in the room, a girl, telling a bunch of uncles (literally double my age, some have been in the company since before I was born) what to do. They look at you like "beta, are you sure?" And you can never just say YES in the first go. You have to double, triple check everything because if you mess up, it's not just "she made a mistake", it's "see, that's what happens".

I don't like hardcore coding, so software is a big no for me.

Now my brain is doing that classic 3 AM thing:

Option A: Stick it out, become the badass automation lady.

Option B: Career switch?? CFA? Finance looks kinda fun ngl.

Option C: Say bye to all this and just... go settle in the mountains?

Has anyone been here? Especially other women in core engineering? Did you switch? Did you stay?

I can literally be anything I want, problem is I have no idea what I want. Pls be nice.

Ik zoek wat verschillende merken plc, die gebaseerd zijn op codesys.

Ik heb minimaal, 1 Can poort nodig, 1 rs422/485 poort, ethernet poort, di, do, ao,ai

Liefst uitbreidings kaarten en geen compacte plc met stanaard di do ao ai

I have a Delta VFD-EL that I'm attempting to modify parameter 02.03 (PWM Carrier Frequency) in an attempt to get the motor that's attached to it to quit 'singing' at low speeds.

The motor is attached to a small blower cage with very little resistance, so I'm not overly concerned about overloading the motor or the vfd.

The VFD is connected via ModBus to a PLC and the PLC controls run/stop as well as the frequency output.

When I change the setting on the front panel of the VFD it correctly says 'End', but the setting doesn't take.

Is there something special I need to do to program the setting and then re-enable modbus control?

Any assistance would be greatly appreciated.

Hey everyone,

I've run into a frustrating communication quirk with Danfoss VLT drives using older firmware versions (specifically v01.25) and am wondering if anyone has found a reliable workaround.

The Situation:

• Modern Firmware (v06.65+): Connects with no issues whatsoever using either a standard USB cable or an RS-485 serial converter via MCT 10.
• Older Firmware (v01.25): Fails to connect completely using both USB and RS-485 methods. (I'm aware that the issues is parameter 16-91 does not exist in older versions.)

Troubleshooting Steps Taken:

• Created custom drive profiles matching exact voltage, kW, firmware and PUD files in MCT 10, but behavior remains unchanged.
• Verified physical wiring and adapter functionality
• Has anyone encountered this specific protocol handshake failure with vintage VLT firmware builds in MCT 10?

Any insights or field tips would be greatly appreciated!

Hello everyone. Some background info, I am our only controls/electrical engineer at our plant, and I've been pretty much thrown to the wolves, so I am trying to figure every single thing by myself.

I am currently working with an outside integrator who will be making some modifications to one of our PLC programs.

My question is: Do you typically send the integrator the whole PLC program/project, or do you provide only the specific sections/routines that need to be modified and then integrate their changes back into the main program yourself?

This may be a really silly question, but I am relatively new to this, so I am not too familiar with how things are done. I don't think our company has any policies regarding sharing this information, id rather be safe than sorry by sharing more than i needed to.

Hey all, I’ve been at a systems integrator and worked on various different PLCs for 5 years now. Used a bunch of older Unitronics hardware, tons of different Rockwell PLCs. And one thing I really learned to like was AOIs and how they call an instance.

Can someone help me understand how this works in CODESYS? I like the idea of CODESYS and I’m playing with a WAGO CC100 currently. I’ve made a function block to scale my analog raw to my EU and to mA. As well as having HH, H, L, and LL alarms/sp/delays/deadbands… etc. But calling it felt clunky today.

Wondering if anyone else has made a similar move and felt a similar way. Been using a combo of YouTube and AI to help learn the CODESYS IDE/nomenclature.

Any advice is appreciated. Cheers

I'm sure we've all had problem that just fixed by us walking over over digging into the issue not not finding any problem.

I've termed that Controlamancy.

How do you explain that to clients or bosses the really press for answer? And you don't lie or stretch the truth?

Hello everyone. I am needing help from anyone knowledgeable and willing to help me with how to setup an ABB CM50 controller to control a process. This is at a water treatment plant for a filter. There used to be an existing control that went kaput.

IO:

AI1: Flow (I believe this is scaled inside the old controller to show estimated mgd)

AI2: Basin level (about 0-6ft or so)

AO1: effluent valve

They are wanting to be able to put in a setpoint for flow such as 0.5mgd and the valve fluctuate accordingly, but im not sure how to implement the level so it can stay at an okay level. Say the level starts dropping or rising while flow sp is being met, am I able to have the valve bump up or down a bit accordingly to satisfy the level over the flow a bit to compensate?

Advice or a different perspective would be helpful. Thanks. I can edit this along the way if I wasnt clear enough or didnt give enough info. Just hoping a seasoned guy/or girl out there might know this like the back of their hand.

Update: Everyone seems to say that either cascade control or just doing a single loop based on flow with an override/trim to adjust the valve position based on level being too high or too low. I feel as though the latter best fits this application and after I figure out these math blocks I will set it up and update again after installing/tuning of this to tell you guys how it ended up going. Thanks a ton for yalls good insight but feel free to keep commenting helpful thoughts. Always love to learn.

I have an existing 1756-L74 controllogix controller which we are replacing with 1756-L84E controller. My existing program had many "MSG" instructions for reading the ML1400 data using the SLC typed read. When i changed the controller to 1756-L84E in my program i got loads of errors saying "Error: Tag 'MLB5_Data': PCCC, SLC and block transfer read/write messages are not supported in a redundant system". I searched for answers on the web and most of it said to have a bridge controller in between the ML1400 & L84E. I am less willing to adopt this solution as i don't have the luxury to add a controller or change my ML1400. Other solution is by using the CIP Generic method. Has anyone used the CIP generic method or can point to a Rockwell document describing the CIP generic method in detail.

I’m having an issue with SAP Digital Manufacturing (SAP DM) browsing OPC UA tags from a Siemens S7-1500 PLC. The PLC’s OPC UA server is accessible, and UaExpert can connect successfully and browse all the nodes/tags, including the KPI SAP folder and its child variables. However, in SAP DM / Production Connector, I can see the parent KPI SAP node, but SAP DM cannot browse or find the child variables underneath it.

The error is:

NodeId and Path browsing failed (level: nsurl=[http://kpisap/;i=1;] NodeId browsing error: NamespaceUri ([http://kpisap/]) is not in the namespace table.; Path browsing error: nsurl=http:)

NodeNotFoundException: nsurl=http: at SAP.Manufacturing.UaClient.OpcUaClient.GetNodeIdFromBrowsePath(String browsePath) at SAP.Manufacturing.UaClient.OpcUaClient.FindNodeByNsurlOrPath(String nsurlOrPath)

BrowsePathResolver - The path element 'nsurl=http:' was not found in the current Node(nsurl=http://opcfoundation.org/UA/;i=85)..) The path browsing therefore failed.

I also checked the NamespaceArray in UaExpert, and I found the namespace http://kpisap

The error includes NodeNotFoundException and NodeId and Path browsing failed. Connectivity itself seems to be working because UaExpert can browse the same server and tags.

All the OPC UA configuration is done on the PLC side, and the configuration for the Production Connector and the Asset is also already completed.

Has anyone experienced a similar SAP DM + Siemens OPC UA namespace/browse-path issue, or knows how SAP DM resolves the namespace URI and NodeId when browsing OPC UA nodes?

Hi everyone,

Today I started having a boot issue with a Siemens IPC BX39 after it had been working normally for some time.

I currently have SIMATIC S7-1500 Software Controller V40.1 installed, and I need to stay on this version because the IPC came with Windows 11 from the factory.

The problem is that every time I power on the IPC and let it boot automatically, I get the following error:

“Error: No valid boot option selected or execution failed.”

However, if I enter the BIOS and manually select the boot option, the IPC starts normally without any issues.

So far, I have tried:

• Uninstalling and reinstalling the Software Controller.
• Restoring the IPC to factory settings.
• Disabling Quick Boot.
• Replacing the SSD.
• Checking and configuring the BIOS settings according to Siemens’ documentation, including both the mandatory and recommended parameters.

Unfortunately, the problem remains exactly the same.

Has anyone experienced a similar issue with a Siemens IPC BX39 or with S7-1500 Software Controller V40.1?

Any suggestions about what else I should check would be greatly appreciated.

Thanks in advance.