Siemens has discontinued the SIMATIC S7-300 — one of the most widely installed PLC platforms in Australian industry. If your plant runs S7-300 hardware, you have three options: migrate to S7-1500 now, gamble on the spares you have, or secure genuine replacement CPUs while they’re still obtainable.
What S7-300 End-of-Life Actually Means
- New units are no longer manufactured; authorised distributor stock is gone or going.
- Siemens’ official path is migration to S7-1500 — a re-engineering project, not a swap.
- Your existing installation keeps working. EOL is a supply problem, not a reliability problem.
In Stock: Genuine S7-300 CPUs
We hold genuine Siemens S7-300 CPUs in Australia, inspected and function-tested before dispatch, with a 3-month warranty on all obsolete stock.
Replace Now or Migrate? A 5-Minute Decision Framework
| Your situation | Sensible move |
|---|---|
| One failed CPU, machine otherwise fine | Like-for-like replacement — hours of downtime, not weeks |
| Aging fleet, no spares on the shelf | Buy critical spares now while genuine stock exists |
| Planned line upgrade within 2–3 years | Bridge with EOL spares, budget migration into the upgrade |
| Need modern comms, safety or capacity | Migrate to S7-1500 — and we can supply spares to keep you running until cutover |
Running MICROMASTER Drives on the Same Line?
Plants running S7-300 PLCs often run Siemens MICROMASTER drives of the same era — also discontinued. We supply modern SINAMICS G120 replacements at 20–30% below distributor pricing, and offer VSD repair where replacement isn’t viable.
Send Us Your S7-300 Part Number
Whatever’s on the label — 6ES7 312, 313, 314, 315, 317 series CPUs, signal modules or power supplies — send it through and we’ll confirm stock, condition and price within 24–48 hours.
Send your part number → All obsolete parts →
Frequently Asked Questions
Is the S7-300 still supported by Siemens?
The S7-300 family has been discontinued and is no longer in production. Existing installations keep working, but new units are no longer available through authorised channels — which is exactly the gap independent suppliers like InstroDirect fill.
Are your S7-300 CPUs genuine?
Yes. We source genuine Siemens hardware through international supply channels and every unit is inspected and function-tested before dispatch. InstroDirect is an independent reseller, not an authorised Siemens distributor.
What warranty do S7-300 parts carry?
All obsolete and end-of-life stock, including S7-300 CPUs, carries a 3-month warranty from delivery, in addition to your rights under our return and refund policy.