S7-300 SM 321 isolated 16-channel 24-48 V AC/DC input module
Siemens 6ES7321-1CH00-0AA0 is a SIMATIC S7-300 SM 321 digital input module with 16 electrically isolated inputs for 24 to 48 V AC/DC signals. Siemens specifies a 40-pole front connection and IEC 61131 type 1 input characteristics. The module is used to acquire field states in an S7-300 station, including applications that require individually referenced input wiring. Procurement should verify the complete order number, input-voltage range, front connector, wiring potential arrangement, rack slot and STEP 7 hardware configuration. Existing project documentation and readable module-label photographs should be reviewed before replacement or spare-part approval.
| Item | Details |
|---|---|
| Product Condition | Original new |
| Availability | In stock |
| Official Lifecycle | PM400: Announcement of product phase-out; product phase-out since 01.10.2023 |
| Warranty | With 1 year warranty |
| Shipping | Worldwide shipping options available |
Condition, availability and warranty are Stockoems commercial information, not manufacturer commitments.
| Parameter | Verified Detail |
|---|---|
| Manufacturer | Siemens |
| Complete Part Number | 6ES7321-1CH00-0AA0 |
| Product Type | SM 321 digital input module |
| Product Family | SIMATIC S7-300 |
| Number of Digital Inputs | 16 |
| Input Voltage | 24 to 48 V AC/DC |
| Input Characteristic | IEC 61131 type 1 |
| Input Current for Signal 1 | 2.7 mA typical |
| Input Delay | 16 ms |
| Galvanic Isolation | Yes |
| Front Connector | 1 x 40-pole |
| Backplane Bus Current | 100 mA maximum at 5 V DC |
| Net Weight | 0.308 kg |
| Country of Origin | Germany |
| Review Area | Application Guidance |
|---|---|
| System Context | SIMATIC S7-300 automation stations |
| Functional Role | Acquires sixteen isolated AC/DC digital field signals |
| Typical Use | Machine and process input monitoring in installed S7-300 systems |
| Electrical Review | Confirm 24-48 V AC/DC signals and wiring potential arrangement |
| Engineering Review | Confirm rack slot, 40-pole connector and STEP 7 hardware configuration |
Compatibility must be evaluated against the installed system configuration. This product should not be treated as a guaranteed direct replacement solely because another item has a similar designation.
Siemens Industry Mall lists 6ES7321-1CH00-0AA0 as PM400: Announcement of product phase-out, with product phase-out since 01.10.2023. This wording is not the same as Discontinued. Confirm the front connector, wiring potential arrangement, rack slot and STEP 7 hardware configuration before replacement.
It identifies a Siemens SIMATIC S7-300 SM 321 digital input module.
The exact module provides 16 electrically isolated digital inputs.
Siemens specifies 24 to 48 V AC/DC input signals.
Siemens lists PM400: Announcement of product phase-out, with product phase-out since 01.10.2023.
Check the exact suffix, voltage range, 40-pole connector, wiring arrangement, rack slot and STEP 7 configuration.
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.
Email: sales6@apterpower.com | WhatsApp: +86 18159889985
Verification, inspection, packaging and logistics support for Siemens 6ES7321-1CH00-0AA0
Our process is designed to give purchasing teams and engineers clear evidence before shipment. Each request is handled around the exact order number, condition requirement and destination rather than a generic product description.
| Service Step | What We Check |
|---|---|
| Model and Suffix Verification | The complete Siemens order number, suffix and visible revision markings are compared with the request. |
| Condition Confirmation | Packaging, seals, enclosure condition and included items are reviewed against the offered condition. |
| Technical Compatibility Review | Available labels, interfaces, connector arrangements and customer-provided system details are compared before approval. |
| Product and Label Photos | Clear inspection images can be supplied for model, revision, connector and condition confirmation. |
| Protective Packaging | Antistatic protection, cushioning and an outer carton are selected for industrial electronic modules. |
| Worldwide Shipping | Available carrier options are coordinated according to destination, package requirements and applicable restrictions. |
| Tracking and Customs Documents | Shipment tracking and standard commercial documents are prepared for the selected route. |
| Warranty and Returns | Written warranty terms and the return authorization process are provided with the commercial agreement. |
| After-Sales Response | Our team follows up on documentation, shipment status and reported product issues. |
Before dispatch, the team checks the visible manufacturer label, order number, revision markings, physical condition and available accessories. Product evidence is compared with the quotation and buyer requirements. Packaging and shipping documents are then prepared for the agreed transport route. This process supports traceable communication without promising unverified quantities or fixed delivery times.
Look for complete company contact details, clear product identification, inspection evidence, written commercial terms and a documented after-sales process.
Confirm the quotation, full order number, product-label photos, condition statement, warranty scope, shipping terms, customs documents and return authorization procedure.
Compare the complete model and suffix, hardware revision, connectors, rack location, power arrangement, signal assignment and project configuration with the installed system.
Warning signs include an incomplete model number, refusal to provide label photos, conflicting specifications, unclear condition descriptions and no explained return process.
Email and WhatsApp details are provided for model verification, inspection requests, packaging coordination and shipping support.
Email: sales6@apterpower.com | WhatsApp: +86 18159889985
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Email: sales6@apterpower.com | WhatsApp: +86 18159889985
