Quick Answer
Short answer: For an immediate Siemens PLC replacement, use our Siemens CPU 226 (6ES7 216-2AD23-0XB0) at $500-900 for a direct drop-in, or choose the Mitsubishi FX2N-80MT at $350-550 as a cost-effective Siemens PLC alternative. Both are in stock now at zzsl-pcl.com, with 40+ total models available for immediate shipment.
We stock 20 Siemens models (CPUs 222 through 412, plus I/O modules) and 20 Mitsubishi models (FX2N, FX1N, FX3U, and Q series) for discontinued Siemens parts replacement. Pricing ranges from $120 for input modules to $5,500 for high-end CPUs. All parts are new or new-old-stock, fully tested, and ship within 1-2 business days for in-stock items.
Head-to-Head Comparison: Siemens vs Mitsubishi PLCs
| Feature | Siemens (Best Drop-in) | Mitsubishi (Best Alternative) |
|---|---|---|
| Top CPU Model | 6ES7 216-2AD23-0XB0 (CPU 226) — 24 DI / 16 DO Transistor | Q26UDHCPU — 260K steps, 9.5ns speed |
| Analog I/O | EM 235 (6ES7 235-0KD22-0XA0) — 4AI/1AO, $200-400 | FX2N-4AD + FX2N-4DA — 4AI + 4AO, $250-400 each |
| Best for Small Systems | CPU 312 (6ES7 312-5BD01-0AB0) — $300-500 | FX1N-40MR-ES/UL — $250-400 (relay outputs) |
| Best for Large Systems | CPU 412-2 PN/DP (6ES7 412-2EK06-0AB0) — $3,000-5,000 | Q20UDHCPU — $2,200-3,500 (200K steps) |
| Ethernet Integrated | CPU 314C-2 PN/DP (6ES7 314-6EH04-0AB0) — $1,200-2,000 | Q04UDEHCPU — $1,000-1,700 (100Mbps Ethernet) |
| Price Range | $120 - $5,000 | $250 - $5,500 |
| Stock Status | 19 Limited Stock, 2 In Stock | 11 Limited Stock, 4 In Stock |
| Best For | Direct drop-in with existing Siemens programs | Cost-effective alternative for discontinued Siemens parts |
Pricing & Availability: What's In Stock Now
Siemens PLCs In Stock (20 models):
- Immediate Ship: CPU 226 (6ES7 216-2AD23-0XB0) — $500-900, EM 223 16x16 I/O (6ES7 223-1BL22-0XA0) — $150-300, SM 321 DI (6ES7 321-1BH02-0AA0) — $120-250, CPU 312 (6ES7 312-5BD01-0AB0) — $300-500, CPU 314C-2 DP (6ES7 314-6CG03-0AB0) — $900-1,500
- Limited Stock: CPUs 222, 224, 313C, 315-2, 317-2, 412-2, plus IM 153-2 and EM 235 — prices range $200-5,000
Mitsubishi PLCs In Stock (20 models):
- Immediate Ship: FX2N-80MT — $350-550, FX2N-48MT — $280-450, FX1N-40MR-ES/UL — $250-400, Q20UDHCPU — $2,200-3,500, Q26UDHCPU — $2,800-4,500, Q10UDEHCPU — $1,600-2,600
- Limited Stock: FX2N-128MT, FX2N-4AD, FX2N-4DA, FX1N-60MT, Q03UDCPU, Q06UDHCPU, FX3U-48MT, Q12PHCPU, Q04UDHCPU, Q10UDHCPU, Q13UDHCPU, Q04UDEHCPU, Q13UDEHCPU — prices range $250-5,500
Where to buy Siemens PLC — all models ship from zzsl-pcl.com. Contact us for lead times on limited stock items.
Programming & Integration Differences
Siemens (TIA Portal / Step 7): Uses structured programming (LAD, FBD, SCL). For discontinued Siemens parts like S7-200 CPUs (222/224/226), you'll need the older Step 7 Micro/WIN software. S7-300/400 models use TIA Portal V13-V17. Migration from S7-200 to S7-1200 requires logic rewrite but I/O mapping is straightforward.
Mitsubishi (GX Works2 / GX Works3): Uses ladder logic primarily, with structured text support on Q/FX3U series. The FX2N series uses the older GX Developer. For obsolete Siemens PLC supplier alternatives, Mitsubishi offers similar performance with easier migration: the FX2N-80MT can replace a CPU 224 with 40 I/O points — just re-terminate the wiring and port the logic.
Key Integration Tip: Both brands support PROFIBUS DP (Siemens native, Mitsubishi via FX2N-232-BD). Siemens PN/DP models offer dual-protocol flexibility. Mitsubishi Q series supports Ethernet/IP and CC-Link. For a true Siemens PLC alternative, the Q04UDEHCPU provides Ethernet direct replacement at $1,000-1,700.
Which Should You Choose? Decision Guide
Choose Siemens if:
- You have existing Siemens programs (no logic rewrite needed)
- You need PROFIBUS DP or PROFINET native integration
- Your system is S7-300/400 based (e.g., CPU 315-2 DP, CPU 412-2 PN/DP)
- Budget isn't the primary concern (premium for brand continuity)
Choose Mitsubishi (as Siemens PLC alternative) if:
- Your Siemens CPU is discontinued (S7-200 series) and you want lower cost
- You need high-speed processing (Q26UDHCPU: 9.5ns vs Siemens 317-2: 0.05ms/k)
- You want more I/O per dollar (FX2N-128MT: 64 DI / 64 DO for $400-700 vs Siemens CPU 226: 24 DI / 16 DO for $500-900)
- You need immediate availability (4 Mitsubishi models In Stock vs 2 Siemens)
Best for drop-in replacement: Siemens CPU 226 (6ES7 216-2AD23-0XB0) — $500-900, In Stock
Best value alternative: Mitsubishi FX2N-80MT — $350-550, In Stock
Frequently Asked Questions
Can I directly replace a discontinued Siemens PLC with a Mitsubishi?
Yes, for most S7-200 and S7-300 models. You'll need to re-terminate wiring and port the logic, but our FX2N and Q series offer equivalent or better I/O counts and speed.
Where can I buy Siemens PLC replacement parts quickly?
Visit zzsl-pcl.com for 20 Siemens models (CPUs 222-412, I/O modules) and 20 Mitsubishi alternatives. Most ship within 1-2 business days.
What is the price range for obsolete Siemens PLCs?
$120 for SM 321 digital input modules to $5,000 for CPU 412-2 PN/DP. Most CPUs range $300-2,000. Check our Siemens inventory for current pricing.
Are these Siemens parts new or used?
All parts listed are new or new-old-stock. Limited stock items may have cosmetic wear but are fully tested.
Do you offer support for programming migration from Siemens to Mitsubishi?
We provide wiring diagrams and basic compatibility notes. For full logic conversion, we recommend a local systems integrator.
Key Takeaways
- Siemens PLC replacement is available now with 20 Siemens models in stock at zzsl-pcl.com
- Discontinued Siemens parts like S7-200 CPUs (222/224/226) can be replaced by Mitsubishi FX2N series for 30-50% less cost
- The best Siemens PLC alternative for value is the Mitsubishi FX2N-80MT at $350-550 with 40 I/O points
- Where to buy Siemens PLC — zzsl-pcl.com ships in-stock models within 1-2 business days
- As an obsolete Siemens PLC supplier, we stock hard-to-find models like CPU 226, CPU 315-2 DP, and CPU 412-2 PN/DP
- Mitsubishi Q series CPUs like Q26UDHCPU offer 9.5ns processing speed for high-performance applications
- All parts are new or new-old-stock with full testing before shipment
Need Siemens or Mitsubishi PLC parts? Browse our Siemens inventory and Mitsubishi inventory. Request a quote → for bulk orders or hard-to-find models.