---
title: Siemens Discontinued PLC Models: S7-200/300/400 Complete Replacement Guide
date: 2026-04-15
author: ZZSL Automation
category: Discontinued Replacement Guide
tags: discontinued replacement, PLC, Siemens, S7-200, S7-300, S7-400, automation parts
---

# Siemens Discontinued PLC Models: S7-200/300/400 Complete Replacement Guide

**Published**: April 15, 2026  
**Author**: ZZSL Automation  
**Category**: Discontinued Replacement Guide  
**Tags**: discontinued replacement, PLC, Siemens, S7-200, S7-300, S7-400

---

## Introduction

Siemens S7-200, S7-300, and S7-400 series PLCs have been officially discontinued, leaving many industrial facilities struggling to find replacement parts. As a trusted automation parts supplier with 6,183+ products in stock, we specialize in helping you find the perfect replacement solutions.

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## Understanding the Discontinuation

### Siemens S7-200 Series
- **Discontinued**: 2015
- **Popular Models**: CPU 222, CPU 224, CPU 226
- **Common Applications**: Small-scale automation, HVAC systems

### Siemens S7-300 Series
- **Discontinued**: 2023
- **Popular Models**: CPU 312, CPU 314, CPU 315-2DP, CPU 317-2PN/DP
- **Common Applications**: Medium-scale industrial automation

### Siemens S7-400 Series
- **Discontinued**: 2024
- **Popular Models**: CPU 412, CPU 414, CPU 417
- **Common Applications**: Large-scale process control

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## Replacement Options We Offer

### 1. Original Stock Availability
We maintain inventory of discontinued Siemens PLCs from our warehouse. If available, we can ship within 48 hours.

### 2. Compatible Alternative Solutions

| Discontinued Model | Recommended Replacement | Compatibility |
|-------------------|------------------------|---------------|
| S7-200 CPU 226 | S7-1200 CPU 1215C | High (90%+) |
| S7-300 CPU 315-2DP | S7-1500 CPU 1515-2PN | High |
| S7-400 CPU 414-4H | S7-400H Redundant System | Very High |

### 3. Refurbished Units
Certified refurbished units with full warranty (6-12 months).

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## Why Choose Us?

- **6,183+ Products in Stock**: Largest inventory of discontinued automation parts
- **26 Brand Experts**: Deep knowledge of Siemens products
- **24-Hour Response**: Quick quotation for your discontinued parts needs
- **Global Shipping**: Delivery to 100+ countries

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## Success Case

**Client**: German Manufacturing Plant  
**Challenge**: Needed 15 units of S7-200 CPU 226 (discontinued since 2015)  
**Solution**: We located original stock in our warehouse  
**Result**: Delivered within 48 hours, saving 3 weeks of downtime

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## How to Get Help

Contact us immediately with your discontinued Siemens part numbers:

- **WhatsApp**: +86 188 1597 8706
- **Email**: module@zzsl-dcs-plc.com
- **24/7 Online Support**

Don't let discontinued parts stop your production. We specialize in finding solutions for hard-to-find automation components.

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*Need immediate help? [Contact our experts](/contact-us/) today!*