Various Siemens SIMATIC S7-300 modules side by side
Repair service and spare parts sales

Siemens SIMATIC S7-300

  • Extending the life cycle of SIMATIC S7-300 assemblies
  • 300+ assemblies available from stock in our shop
  • Ensure system availability despite discontinuation
  • Repair service and spare parts sales
  • Up to 36 months warranty and guarantee
The most frequently asked questions about the current SIMATIC S7-300 phase-out
Buy SIMATIC S7-300 assemblies in the shop

Siemens SIMATIC S7-300 – buy now from EICHLER

Ensure the availability of your SIMATIC S7-300 controllers even after discontinuation: In our shop, you will find over 300+ PLC modules available directly from stock – from CPU modules to digital and analog I/O cards to communication modules.

Benefit from up to 36 months warranty and guarantee, as well as fast delivery times and expert advice. This ensures that your automation technology remains reliable, economical, and ready for use in the future.

SIMATIC S7-300

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SIEMENS 6ES7318-3EL00-0AB0, PLC Controls, SIMATIC S7-300, K0171264
6ES7318-3EL00-0AB0
  • Manufacturer: SIEMENS
  • Special field: PLC Controls
  • Article group: SIMATIC S7-300
  • EICHLER-art.no.: K0171264
  • EAN: 4025515073154
SIEMENS 6ES7321-1BL00-0AA0, PLC Controls, SIMATIC S7-300, K0118527
6ES7321-1BL00-0AA0
  • Manufacturer: SIEMENS
  • Special field: PLC Controls
  • Article group: SIMATIC S7-300
  • EICHLER-art.no.: K0118527
  • EAN: 4025515060772
  • UPC: 662643175493
SIEMENS 6ES7331-7KF02-0AB0, PLC Controls, SIMATIC S7-300, K0118575
6ES7331-7KF02-0AB0
  • Manufacturer: SIEMENS
  • Special field: PLC Controls
  • Article group: SIMATIC S7-300
  • EICHLER-art.no.: K0118575
  • EAN: 4025515066835
  • UPC: 662643177909
SIEMENS 6ES7322-1BL00-0AA0, PLC Controls, SIMATIC S7-300, K0118545
6ES7322-1BL00-0AA0
  • Manufacturer: SIEMENS
  • Special field: PLC Controls
  • Article group: SIMATIC S7-300
  • EICHLER-art.no.: K0118545
  • EAN: 4025515060932
  • UPC: 040892560664
SIEMENS 6ES7331-7PF01-0AB0, PLC Controls, SIMATIC S7-300, K0139375
6ES7331-7PF01-0AB0
  • Manufacturer: SIEMENS
  • Special field: PLC Controls
  • Article group: SIMATIC S7-300
  • EICHLER-art.no.: K0139375
  • EAN: 4025515071549
  • UPC: 662643177916
SIEMENS 6ES7315-2AG10-0AB0, PLC Controls, SIMATIC S7-300, K0118519
6ES7315-2AG10-0AB0
  • Manufacturer: SIEMENS
  • Special field: PLC Controls
  • Article group: SIMATIC S7-300
  • EICHLER-art.no.: K0118519
  • EAN: 4025515068846
SIEMENS 6ES7332-5HD01-0AB0, PLC Controls, SIMATIC S7-300, K0118585
6ES7332-5HD01-0AB0
  • Manufacturer: SIEMENS
  • Special field: PLC Controls
  • Article group: SIMATIC S7-300
  • EICHLER-art.no.: K0118585
  • EAN: 4025515061298
  • UPC: 040892562316
SIEMENS 6ES7326-2BF01-0AB0, PLC Controls, SIMATIC S7-300, K0118569
6ES7326-2BF01-0AB0
  • Manufacturer: SIEMENS
  • Special field: PLC Controls
  • Article group: SIMATIC S7-300
  • EICHLER-art.no.: K0118569
  • EAN: 4025515069317
SIEMENS 6ES7336-1HE00-0AB0, PLC Controls, SIMATIC S7-300, K0118594
6ES7336-1HE00-0AB0
  • Manufacturer: SIEMENS
  • Special field: PLC Controls
  • Article group: SIMATIC S7-300
  • EICHLER-art.no.: K0118594
  • EAN: 4025515061403
SIEMENS 6ES7332-5HF00-0AB0, PLC Controls, SIMATIC S7-300, K0118586
6ES7332-5HF00-0AB0
  • Manufacturer: SIEMENS
  • Special field: PLC Controls
  • Article group: SIMATIC S7-300
  • EICHLER-art.no.: K0118586
  • EAN: 4025515068686
  • UPC: 040892561203
SIEMENS 6ES7315-2AF03-0AB0, PLC Controls, SIMATIC S7-300, K0002347
6ES7315-2AF03-0AB0
  • Manufacturer: SIEMENS
  • Special field: PLC Controls
  • Article group: SIMATIC S7-300
  • EICHLER-art.no.: K0002347
  • EAN: 4025515060659
SIEMENS 6ES7323-1BL00-0AA0, PLC Controls, SIMATIC S7-300, K0118565
6ES7323-1BL00-0AA0
  • Manufacturer: SIEMENS
  • Special field: PLC Controls
  • Article group: SIMATIC S7-300
  • EICHLER-art.no.: K0118565
  • EAN: 4025515061120
  • UPC: 662643117950
SIEMENS 6ES7317-2FK14-0AB0, PLC Controls, SIMATIC S7-300, K0252214
6ES7317-2FK14-0AB0
  • Manufacturer: SIEMENS
  • Special field: PLC Controls
  • Article group: SIMATIC S7-300
  • EICHLER-art.no.: K0252214
  • EAN: 4025515077800
  • UPC: 040892550344
SIEMENS 6ES7315-2AH14-0AB0, PLC Controls, SIMATIC S7-300, K0227990
6ES7315-2AH14-0AB0
  • Manufacturer: SIEMENS
  • Special field: PLC Controls
  • Article group: SIMATIC S7-300
  • EICHLER-art.no.: K0227990
  • EAN: 4025515077763
  • UPC: 040892550306
SIEMENS 6ES7331-1KF01-0AB0, PLC Controls, SIMATIC S7-300, K0136704
6ES7331-1KF01-0AB0
  • Manufacturer: SIEMENS
  • Special field: PLC Controls
  • Article group: SIMATIC S7-300
  • EICHLER-art.no.: K0136704
  • EAN: 4025515070467
SIEMENS 6ES7307-1BA00-0AA0, PLC Controls, SIMATIC S7-300, K0118502
6ES7307-1BA00-0AA0
  • Manufacturer: SIEMENS
  • Special field: PLC Controls
  • Article group: SIMATIC S7-300
  • EICHLER-art.no.: K0118502
  • EAN: 4025515150343
SIEMENS 6ES7307-1BA01-0AA0, PLC Controls, SIMATIC S7-300, K0252201
6ES7307-1BA01-0AA0
  • Manufacturer: SIEMENS
  • Special field: PLC Controls
  • Article group: SIMATIC S7-300
  • EICHLER-art.no.: K0252201
  • EAN: 4025515152460
  • UPC: 040892550269
SIEMENS 6ES7307-1EA01-0AA0, PLC Controls, SIMATIC S7-300, K0227763
6ES7307-1EA01-0AA0
  • Manufacturer: SIEMENS
  • Special field: PLC Controls
  • Article group: SIMATIC S7-300
  • EICHLER-art.no.: K0227763
  • EAN: 4025515152477
  • UPC: 662643517958
SIEMENS 6ES7307-1KA00-0AA0, PLC Controls, SIMATIC S7-300, K0118505
6ES7307-1KA00-0AA0
  • Manufacturer: SIEMENS
  • Special field: PLC Controls
  • Article group: SIMATIC S7-300
  • EICHLER-art.no.: K0118505
  • EAN: 4025515150367
SIEMENS 6ES7307-1KA02-0AA0, PLC Controls, SIMATIC S7-300, K0252202
6ES7307-1KA02-0AA0
  • Manufacturer: SIEMENS
  • Special field: PLC Controls
  • Article group: SIMATIC S7-300
  • EICHLER-art.no.: K0252202
  • EAN: 4025515152484
  • UPC: 040892550276
SIEMENS 6ES7312-1AE13-0AB0, PLC Controls, SIMATIC S7-300, K0171248
6ES7312-1AE13-0AB0
  • Manufacturer: SIEMENS
  • Special field: PLC Controls
  • Article group: SIMATIC S7-300
  • EICHLER-art.no.: K0171248
  • EAN: 4025515074427
SIEMENS 6ES7312-5AC01-0AB0, PLC Controls, SIMATIC S7-300, K0136663
6ES7312-5AC01-0AB0
  • Manufacturer: SIEMENS
  • Special field: PLC Controls
  • Article group: SIMATIC S7-300
  • EICHLER-art.no.: K0136663
  • EAN: 4025515060345
SIEMENS 6ES7312-5AC02-0AB0, PLC Controls, SIMATIC S7-300, K0002338
6ES7312-5AC02-0AB0
  • Manufacturer: SIEMENS
  • Special field: PLC Controls
  • Article group: SIMATIC S7-300
  • EICHLER-art.no.: K0002338
  • EAN: 4025515060352
SIEMENS 6ES7312-5BD00-0AB0, PLC Controls, SIMATIC S7-300, K0118509
6ES7312-5BD00-0AB0
  • Manufacturer: SIEMENS
  • Special field: PLC Controls
  • Article group: SIMATIC S7-300
  • EICHLER-art.no.: K0118509
  • EAN: 4025515067146
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Eichler technician holding a Siemens SIMATIC S7-300 module

From October 2025, SIMATIC S7-300 assemblies will enter the product phase-out. We answer the most important questions!

The EICHLER experts, provide support, even after the phase-out

Siemens SIMATIC S7-300 FAQ

How old is the Siemens SIMATIC S7-300?

The SIMATIC S7-300 was introduced by Siemens in 1994 together with its sister models, the S7-200 and S7-400, as a new family of PLC controllers. This means that the SIMATIC S7-300 series is now around 30 years old. The new S7 modules are the direct successor to the SIMATIC S5 series. The new S7 controllers quickly became the standard PLC system in automation technology and were continuously expanded over many years. The introduction of modern fieldbus technology standards such as PROFIBUS and Industrial Ethernet enabled fully integrated data communication from the field level of the plant to the higher-level company divisions for the first time. This created a continuous information chain that seamlessly linked technical processes and commercial operations – the beginning of a new era of industrial digitalization and networking. Despite its age, the S7-300 is still widely used in industry in 2025, which is why Siemens has planned a transition and support period until approximately 2033.

Will production of the SIMATIC S7-300 be discontinued?

Yes, Siemens is discontinuing production of SIMATIC S7-300 / ET 200M components. The official product phase-out (PM400) began on October 1, 2023. The date from which new S7-300 / ET 200M components can no longer be ordered (discontinuation, PM410) is October 1, 2025. After October 1, 2025, the manufacture of new components will be discontinued.

Which programming language is used in Siemens SIMATIC S7-300?

The standardized PLC languages according to IEC 61131-3 are used for programming the SIMATIC S7-300. Siemens has implemented these in STEP 7 (Classic). The most important programming languages are: KOP (ladder logic), graphical representation, based on electrical circuit diagrams. FUP (Function Block Diagram, FBD), also graphical, with logical function blocks. AWL (Statement List, STL), text-based language, similar to Assembler, very flexible and often used for complex processes. SCL (Structured Control Language) (optional, with additional package), higher-level language, based on Pascal, suitable for calculations and structured programming. GRAPH (Sequential Function Chart, SFC) (optional), language for modeling step chains and state sequences.

What is the successor to the Siemens SIMATIC S7-300?

The official successor to the SIMATIC S7-300 and ET 200M is the SIMATIC S7-1500 in combination with the ET 200MP peripherals. The S7-1500 has been on the market since 2012 and was developed by Siemens specifically as a modern platform to take over the strengths of the S7-300 while covering all requirements for today's and tomorrow's automation systems. The ET 200MP peripherals are the direct successor generation to the classic S7-300 modules and the ET 200M modules. Since the S7-1500 CPUs differ technically from the S7-300 CPUs (new backplane, new slots, new power supply), the old S7-300/ET200M modules can no longer be used directly. Instead, Siemens offers the ET 200MP series of compatible modules that are functionally very similar to the familiar S7-300/ET200M modules, are mechanically and electrically compatible with the S7-1500 design, and can be seamlessly integrated into the TIA Portal.

What is the life cycle of the SIMATIC S7-300?

Market launch (from approx. 1994) – First release as successor to SIMATIC S5. Expanded over the years with numerous CPUs, signal modules, and communication processors. Active marketing/full availability (1994–approx. 2020s) – Standard PLC in many industries. Used millions of times worldwide. Consistent support in STEP 7 (Classic). Discontinuation announcement (PM400) – October 2023: Siemens officially announces the discontinuation of the product. Start of phase-out planning for customers. End of new procurement – October 1, 2025: New orders for S7-300 / ET 200M components no longer possible from Siemens (only remaining stock, distributors, or spare parts inventory). Spare parts and service phase – Siemens guarantees spare parts availability and technical support until at least 2033. Experience shows that important spare parts may still be available from third-party suppliers or stock after this date – but at increasing prices and with increasing risk. Product discontinuation (End of Service and Repair EOSR) – SIMATIC S7-300 is expected to reach end of life (EOL) after 2033. After that, only third-party service or replacement via the used market will be available.

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

The main differences between SIMATIC S7-300 and S7-1500 modules are: Performance & memory S7-300: Medium computing power, limited memory, suitable for standard automation tasks. S7-1500: Significantly faster CPUs, more memory, and short response times – also ideal for complex applications. Engineering & Software S7-300: Classically programmed with STEP 7 (Classic); can also be used in the TIA Portal to a limited extent. S7-1500: Programmed exclusively in the TIA Portal, with a uniform interface for PLCs, HMIs, drives, and networks. Diagnostics & Operation S7-300: Limited diagnostics, mostly via external tools or operating devices. S7-1500: Integrated diagnostics, web server, plain text messages, and display directly on the CPU. Safety & Technology S7-300: Safety and technology functions only with separate CPUs or additional modules. S7-1500: Safety (F-CPUs) and technology (e.g., motion control) are integrated directly into the CPU. Security (IT security) S7-300: Hardly any integrated protection functions. S7-1500: Comprehensive protection of know-how, access, and manipulation.

Can S7-300 controllers be programmed in the TIA Portal?

Yes, S7-300 and S7-400 controllers can generally be programmed in the TIA Portal, but with restrictions. Support began with TIA Portal V13 (from around 2014). Not all older CPUs and modules are compatible. Older assemblies in particular, which were discontinued before the introduction of the TIA Portal, can only be used in STEP 7 Classic. Many projects that were originally created in STEP 7 (Classic) can be migrated to the TIA Portal. However, blocks, libraries, or special functions must be adapted, as not everything can be transferred 1:1. Despite compatibility in TIA Portal, Siemens still recommends migrating to the S7-1500 for new projects, as the full range of functions of the TIA Portal can be used without restrictions. S7-300 CPU 312/313 → only partially usable in TIA Portal; many older CPUs are no longer supported at all. S7-300 CPU 314/315/317 → supported from TIA Portal V13 onwards, but with restrictions for older hardware versions. S7-300 CPU 319 → well supported, migration to TIA Portal is possible. S7-400 CPU 412/414 → supported from TIA Portal V13 onwards, but not all communication processors. S7-400 CPU 416/417 → generally supported, but with restrictions for special modules. Older special assemblies (e.g., Cx or older T CPUs) → not supported in TIA Portal, can only be used with STEP 7 Classic.

What is the difference between Siemens SIMATIC S7-300 and S7-400?

The SIMATIC S7-300 and S7-400 both belong to the same generation of Siemens controllers, but differ significantly in their objectives and performance. For many years, the S7-300 was the standard solution in mechanical and plant engineering. It is particularly suitable for medium-sized automation tasks, such as in packaging machines, conveyor systems, or assembly facilities. Its CPUs offer solid but limited computing power and are modularly expandable—albeit within a manageable scope. Communication usually takes place via PROFIBUS or PROFINET, requiring additional modules. The S7-400, on the other hand, was developed for larger and more complex applications, such as those found in the process industry (chemical, energy, water/wastewater, paper, or steel mills). It has significantly more powerful CPUs, can process considerably more inputs and outputs, and offers high scalability thanks to large racks and numerous expansion options. A key difference is the option of using redundancy—i.e., operating with dual CPUs or networks—which ensures very high system availability. The memory sizes and address spaces of the S7-400 are also significantly larger than those of the S7-300. The S7-300 is designed for medium-sized control tasks with moderate performance requirements. The S7-400 is designed for large, complex, and critical systems where performance, scalability, and reliability are crucial. Both systems are now being phased out. Siemens recommends switching to the S7-1500 (as the successor to the S7-300) for new projects and migrations, or in combination with PCS 7 / S7-410 process control technology as a replacement for the S7-400.

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