Buying the wrong automation part — even one digit off in a part number — can cost thousands in downtime. This checklist walks through exactly what to verify before placing an order for PLCs, servo drives, VFDs, sensors, and I/O modules.
The 10-Point Verification Checklist
- Part Number Precision: Include ALL suffix and revision codes. "6ES7 214-1AG31-0XB0" is not the same as "6ES7 214-1AG40-0XB0" — the firmware generation difference can prevent program upload.
- Firmware/Series Compatibility: Check your programming software version compatibility. S7-1200 firmware V4.0+ requires TIA Portal V14+.
- Power Requirements: 24V DC vs 120/240V AC — verify the power supply matches your cabinet. Many European machines use 24V DC; North American panels often use 120V AC.
- Communication Protocol: PROFINET vs EtherNet/IP vs Modbus — cannot be interchanged. Verify your network infrastructure.
- Environmental Rating: IP20 for cabinet mounting; IP65/IP67 for field mounting. Washdown areas require stainless steel housings.
- Certifications: CE for Europe, UL for North America, CCC for China. Non-certified parts may fail inspection.
- Supplier Verification: Check for ISO certification, warranty terms (minimum 12 months), and return policy. Request test reports.
- Lead Time Reality: "In stock" can mean different things. Confirm actual ship date — not just inventory status.
- Counterfeit Risk Assessment: High-demand discontinued parts (AB 1746, ABB ACS800, Siemens S7-300) have significant counterfeit risk. Only buy from authorized/tested sources.
- Total Cost Calculation: Include shipping, customs duties, and potential import taxes. A "$200 savings" can disappear in $150 express shipping.
Quick Reference: Common Part Number Families
| Brand | Common Prefixes | Status |
|---|---|---|
| Siemens | 6ES7, 6SL, 6AV, 6EP | Active + Mature |
| Allen-Bradley | 1746, 1756, 1769, 1794, 22B | Mixed — 1746 discontinued |
| ABB | ACS, 3HAC, 3HNA, 1SAP | ACS800 phased out |
| FANUC | A06B, A16B, A20B, A05B | Legacy models scarce |
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