Legacy PLC migration: S7-300, PLC-5 and SLC 500
Siemens moved the S7-300 to spares-only on Oct 1, 2025. Rockwell's PLC-5 and SLC 500 are discontinued. If your lines still run on them, the question is when you migrate, not whether.
We start with an audit that tells you where you stand: what controllers you have, how exposed each line is if a card fails, and a staged plan to migrate during planned downtime, with a fallback to the old rack if anything goes sideways.
Send an RFQ · Office: (877) 524-6674 · Line down? (877) 790-4697, 24/7, subject to personnel availability
What we migrate
- Siemens S7-300 to S7-1500 / TIA Portal (and Step 5 to TIA Portal)
- Allen-Bradley PLC-5 to ControlLogix
- Allen-Bradley SLC 500 to CompactLogix
- HMI moves along with the PLC where it makes sense (WinCC, FactoryTalk View, Ignition)
What the audit gives you
- An inventory of legacy controllers, line by line
- Spares risk for each: if it died tonight, is there one on the shelf?
- A staged migration plan sized to your shutdown windows
- A fallback plan so you can return to the old rack if needed
The plan is yours. If you want us to do the work, we quote it from the hours it actually takes.
How the cutover works
- We back up and document what is running today.
- We convert and rewrite the program, then test it before the window.
- We cut over on site during your outage, with the old hardware ready to go back in.
- We prove it with your operators before we leave.
See also: Outage-window planning · Program backup and version control
Send the platform, the symptom, and your outage window.
Send an RFQ on the contact page or email sales@ts-controls.com. Office: (877) 524-6674. Line down right now? Call (877) 790-4697, 24/7, subject to personnel availability. We come back with a plan, not a brochure.
Straight answers
Questions we get.
Do we have to migrate everything at once?
No. Most plants go line by line, starting with the most exposed one.
Can you work with our existing code if nobody here wrote it?
Yes. We read what is running, document it, and convert it. Messy legacy code is normal.
What if the new system has a problem on startup?
That is why every plan has a fallback to the old rack until the new one is proven.
Do you come on site?
Yes. Evaluations happen at the machine so the first trip is not a guessing trip.
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