Verified configuration, commercial status and procurement checks
Siemens 6ES7421-1FH20-0AA0 is a SIMATIC S7-400 SM 421 digital input module for isolated acquisition of field signals. The verified configuration provides sixteen digital inputs rated for 120/230 V UC and follows IEC 1131-2 Type 2 input characteristics. It is intended for S7-400 system integration where the installed rack, wiring, signal voltage and module parameterization match the original design. Procurement and maintenance teams should verify the complete suffix, connector and wiring scheme, system documentation and spare-part strategy before installation. Stockoems condition, availability and warranty statements are commercial information, not Siemens commitments.
| Product Condition | Original new |
|---|---|
| Availability | In stock |
| Official Life Cycle | Prod. Cancellation |
| Warranty | With 1 year warranty |
| Shipping | Worldwide shipping coordination |
Condition, availability and warranty are Stockoems commercial information and are not manufacturer commitments.
| Manufacturer | Siemens |
|---|---|
| Complete Part Number | 6ES7421-1FH20-0AA0 |
| Product Type | SM 421 isolated digital input module |
| System | SIMATIC S7-400 |
| Digital Inputs | 16 |
| Input Voltage | 120/230 V UC |
| Input Standard | IEC 1131-2 Type 2 |
| Official Product Status | Spare Part |
| Packaging Dimensions | 30.2 × 22.9 × 4.1 cm |
| Net Weight | 0.776 kg |
| Official Life Cycle | Prod. Cancellation |
| S7-400 digital signal acquisition | Receives compatible 120/230 V UC field states in an S7-400 station. |
|---|---|
| Industrial cabinet retrofits | Supports replacement in verified SM 421 installations. |
| High-voltage status monitoring | Acquires sixteen isolated on/off signals within the official input rating. |
| Maintenance spares | Complete suffix and wiring checks reduce replacement risk. |
Verify the installed S7-400 rack and CPU configuration, module slot, front connector, wiring scheme, 120/230 V UC signal levels, parameterization and the complete 6ES7421-1FH20-0AA0 suffix. Similar SM 421 modules may have different voltage and channel configurations.
The Siemens official product page identifies 6ES7421-1FH20-0AA0 with the life-cycle wording Prod. Cancellation and lists it as a Spare Part.
It provides sixteen isolated digital inputs.
The official configuration is rated for 120/230 V UC.
Siemens specifies IEC 1131-2 Type 2.
Siemens uses the wording Prod. Cancellation for this complete order number.
Verify the S7-400 rack, module slot, front connector, field voltage, wiring, parameterization and complete suffix.
Send us the complete part number, required quantity, destination country and product label photos. Our team will check availability, condition, compatibility requirements and shipping options.
Verification, inspection, packaging and worldwide order coordination
| 1. Model and suffix verification | The complete 6ES7421-1FH20-0AA0 order number is checked against the purchase request and product label. |
|---|---|
| 2. Condition confirmation | Available condition evidence and product photos are reviewed before dispatch. |
| 3. Technical compatibility review | Application, electrical, interface and system requirements are checked with the buyer. |
| 4. Product and label photo confirmation | Clear unit and label photos support identity and revision checks. |
| 5. Protective packaging | The unit is protected for handling and international transportation. |
| 6. Worldwide shipping | Carrier and route options are coordinated for the destination. |
| 7. Shipment tracking | Tracking details are supplied after dispatch. |
| 8. Customs documentation | Commercial shipping documents are prepared for the order. |
| 9. Written warranty terms | Warranty scope is provided in writing with the commercial offer. |
| 10. Return authorization process | Returns require prior authorization and documented review. |
| 11. After-sales response | The team follows up on order, logistics and product-condition questions. |
Inspection and label verification
Protective packaging preparation
Shipping and documentation coordination
Choose a supplier that checks the complete model and suffix, provides clear product and label photos, states condition and warranty in writing, discusses compatibility limits, uses protective packaging, supplies traceable shipping details and maintains a documented return authorization process.
Warning signs include incomplete part numbers, refusal to provide label evidence, vague condition descriptions, unsupported compatibility claims, unrealistic delivery promises, undocumented warranty terms, unclear payment identity and no written return process.
Send us the complete part number, required quantity, destination country and product label photos. Our team will check availability, condition, compatibility requirements and shipping options.
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| 031-02502-000 | WE77/Ex-2 230V PN.129198 | MIL-RC3412 10/100BASE-TX | IGC2231 | RH400380 |
Send us the complete part number, required quantity, destination country and product label photos. Our team will check availability, condition, compatibility requirements and shipping options.
