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PLC Siemens S7-300

Found 119 products
Siemens × S7-300 ×
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SIMATIC S7-300 — modular controllers for industrial automation

SIMATIC S7-300 is Siemens classic modular PLC platform with 30+ years in industrial use. The Siemens PLC catalog lists 94 models: CPUs, I/O modules, communication processors and power supplies. Compatible with STEP 7 and TIA Portal, up to 32 modules per rack.

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

Is S7-300 still supported by Siemens?

S7-300 has Legacy status. Technical support and spare parts continue, but new projects should use S7-1200 or S7-1500.

What is the difference between S7-300 and S7-1500?

S7-1500 is 10–20x faster, has built-in PROFINET, display, extended diagnostics. S7-1500F supports Safety SIL 2–3.

What programming languages does S7-300 support?

All five IEC 61131-3 languages: LAD, FBD, STL, SCL, GRAPH. Programmed in STEP 7 or TIA Portal.

How to connect S7-300 to Ethernet?

Add CP 343-1 module or use CPU with built-in PROFINET (315-2 PN/DP, 317-2 PN/DP).

Maximum I/O count?

Up to 32 SM modules per rack (up to 1024 digital channels). With 3 expansion racks via IM 360/361 — up to 128 modules.