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PLC Siemens S7-300

Found 119 products
Siemens × S7-300 ×
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S7-300 in 2026: when it still makes sense, when to pick S7-1500

Siemens has officially moved S7-300 to Legacy status. What that means for us in practice. We see two recurring requests. First: a customer needs to swap a failed CPU or module on an old line where the whole program is written in STEP 7 Classic and nobody plans to rewrite it. Second: a customer needs to add a duplicate cabinet to an existing system without introducing a new environment. We keep S7-300 in stock for both (ask us for specific 6ES7 part-number availability).

Our Siemens PLC catalog carries 94 S7-300 SKUs: CPU 313C / 314C / 315-2 PN/DP / 317-2, digital SM 321/322, analog SM 331/332 (including thermocouples), CP 343-1 communication processors, IM 360/361 rack interfaces, PS 307 power supplies. Programmable in both STEP 7 V5.5/V5.6 (classic) and TIA Portal (from V13).

Should you put S7-300 into a new project

Short answer: no, take S7-1500 instead (per Siemens datasheet 10-20x faster, built-in PROFINET, F-variants for SIL2/SIL3). For smaller jobs — S7-1200: compact, cheaper, same TIA Portal. We only ship S7-300 when there is hard compatibility with an installed base, or the engineering team is locked into STEP 7 Classic and a TIA migration is off the table.

What we ask before quoting. First: exact 6ES7 code from the side label (CPU or module), to avoid revision mismatches. Second: do you have the MMC card with the program (otherwise we ship blank and you re-flash). Third: communication channel (MPI/PROFIBUS DP or PROFINET), because PROFINET needs a separate CP 343-1. One catch: some SKUs are EU-order with 7-14 day lead time. Common CPUs and PSUs sit on our regular shelf.

Where S7-300 is used

  • Manufacturing lines and conveyors — cycle control, drive synchronisation.
  • Water treatment and pump stations — PID control, pump alternation.
  • HVAC systems — centralized air handling control.
  • Machine tools and packaging — axis positioning, part counting.
  • Power distribution — monitoring, SCADA integration via PROFIBUS DP.

S7-300 modules and accessories

PLC expansion modules:

  • CPU — 313C, 314C, 315-2, 317-2.
  • SM 321/322 — digital I/O.
  • SM 331/332 — analog I/O.
  • CP 343-1 — Ethernet/PROFINET.
  • IM 360/361 — rack interface.

Migrating from S7-300 to S7-1500

S7-300 is a Legacy platform. For new projects: S7-1500 or S7-1200. Existing installations continue to operate, spare parts available.

Warranty and delivery

All S7-300 controllers ship with official warranty. Delivery across Ukraine via Nova Poshta. Bank transfer with VAT or cash on delivery.

Frequently Asked Questions

Why is S7-300 still purchased?

S7-300 is mostly bought for repair, support and expansion of existing lines where SIMATIC S7-300 architecture is already installed.

Should S7-300 be replaced with S7-1500?

For new projects S7-1500 is often better, but for repairing a running line replacing a specific S7-300 module can be faster and cheaper.

What S7-300 data is needed for replacement?

The exact CPU or SM/CP module article, version, signal type, MPI/PROFIBUS network and cabinet configuration are needed.

Can you check S7-300 compatibility?

Yes. Send a photo of the article number or the module list from the project, and we will check replacement compatibility.