Industrial Automation Solution – SIEMENS 6ES7321-1BP00-0AA0 | SM 321 Series
Where This Product Is Used
The SIEMENS 6ES7321-1BP00-0AA0 SM 321 Digital Input Module is engineered for demanding industrial environments where reliable signal acquisition is critical. Typical deployment scenarios include:
- Discrete Manufacturing Lines – Reads pushbutton, limit switch, and proximity sensor signals on automotive assembly and stamping lines.
- Process & Chemical Plants – Monitors valve position feedback, level switches, and emergency-stop circuits in continuous-process facilities.
- Water & Wastewater Treatment – Captures pump-run confirmation and flow-switch status in SCADA-integrated control panels.
- Building Automation & HVAC – Interfaces with door contacts, smoke detectors, and fan-status relays in BMS architectures.
- Material Handling & Conveyor Systems – Reads photo-eye and encoder-index signals for precise positioning and jam detection.
- Power Distribution & Utilities – Acquires breaker-status and relay-trip signals in substation automation panels.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 6ES7321-1BP00-0AA0 |
| Series | SIMATIC S7-300 SM 321 |
| Module Type | Digital Input (DI) |
| Number of Inputs | 32 × DC 24 V |
| Input Voltage (Rated) | 24 V DC |
| Input Current (per channel) | 7 mA typical |
| Signal “1” Level | 15 V – 30 V DC |
| Signal “0” Level | -3 V – +5 V DC |
| Isolation | Optocoupler (500 V AC, 1 min) |
| Input Delay (adjustable) | 0.1 ms / 0.5 ms / 3 ms / 15 ms / 20 ms |
| Backplane Bus Current Draw | 100 mA at 5 V DC |
| Power Dissipation | 4.5 W max |
| Dimensions (W × H × D) | 40 mm × 125 mm × 120 mm |
| Weight | Approx. 240 g |
| Operating Temperature | 0 °C to +60 °C |
| Storage Temperature | -40 °C to +70 °C |
| Degree of Protection | IP 20 |
| Mounting | S7-300 DIN Rail (Profile Rail) |
| Connector Type | 40-pin front connector (not included) |
Why Engineers Specify This Model
- High Channel Density – 32 isolated 24 V DC inputs in a single 40 mm-wide slot reduce panel footprint and wiring cost versus two 16-channel modules.
- Configurable Input Delay – Five selectable filter times (0.1 ms to 20 ms) allow engineers to suppress contact bounce or high-frequency noise without external hardware.
- Galvanic Isolation – Optocoupler isolation protects the CPU backplane from field-side transients and ground loops common in heavy-industry environments.
- Plug-and-Play Integration – Fully supported in STEP 7 Classic and TIA Portal; hardware catalog entry enables drag-and-drop configuration with automatic address assignment.
- Proven Reliability – Part of the SIMATIC S7-300 platform with a global installed base exceeding 20 years of continuous production use.
- Hot-Swap Ready – Module can be replaced without removing field wiring when using the 40-pin front connector system.
Complete System Bill of Materials
For a fully operational S7-300 digital input station, the following components are typically required alongside the 6ES7321-1BP00-0AA0:
- CPU – e.g., 6ES7315-2EH14-0AB0 (CPU 315-2 PN/DP) or equivalent S7-300 CPU
- Power Supply Module – 6ES7307-1EA01-0AA0 (PS 307, 5 A) or 6ES7307-1KA02-0AA0 (10 A)
- Profile Rail (DIN Rail) – 6ES7390-1AE80-0AA0 (480 mm) or project-specific length
- Front Connector (40-pin) – 6ES7392-1AM00-0AA0 (screw terminals) or 6ES7392-1BM01-0AA0 (spring terminals)
- Bus Connector – 6ES7390-0AA00-0AA0 (included with most S7-300 modules)
- 24 V DC Field Power Supply – SITOP PSU100S or equivalent for sensor/actuator loop power
- Programming Cable / MPI Adapter – 6ES7972-0CB20-0XA0 (PC Adapter USB) for STEP 7 / TIA Portal
Compliance & Industry Standards
- CE Marking – EU Low Voltage Directive & EMC Directive compliant
- UL Listed – UL 508 (Industrial Control Equipment)
- IEC 61131-2 – Programmable Controllers: Equipment Requirements & Tests
- ATEX / IECEx – Suitable for use in Zone 2 hazardous areas with appropriate enclosure (consult Siemens documentation)
- RoHS Compliant – Restriction of Hazardous Substances Directive 2011/65/EU
- PROFIBUS DP / MPI Backplane Bus – Compliant with IEC 61158
Quality Assurance & Sourcing
At Konmask.com, every SIEMENS module undergoes a structured verification process before dispatch:
- Authenticity Check – Holographic label, date code, and firmware version verified against SIEMENS factory records.
- Functional Pre-Test – Each unit is bench-tested for correct backplane communication and channel-level I/O response prior to shipment.
- Traceability – Batch and serial numbers logged for full supply-chain traceability.
- Packaging – Original anti-static packaging retained; double-boxed for international freight.
- Warranty – 12-month replacement warranty against manufacturing defects.
How to Source This Part
- Add to Cart – Click “Add to Cart” above and proceed to checkout. We accept T/T bank transfer, PayPal, and major credit cards.
- Request a Quote – For orders of 5+ units or project BOM pricing, email support@konmask.com with your quantity and delivery timeline.
- Lead Time – In-stock units ship within 1–3 business days. Ex-stock orders for large quantities: 7–15 business days.
- Export Documentation – Commercial invoice, packing list, and certificate of origin available for all international shipments.
- Customs HS Code – 8537.10 (Boards, panels, consoles for electric control) — confirm with your freight forwarder.
Application-Specific FAQ
Q: Can the 6ES7321-1BP00-0AA0 be used with an S7-400 rack?
A: No. SM 321 modules are mechanically and electrically designed exclusively for the S7-300 profile rail and backplane bus. For S7-400 systems, use the SM 421 family (e.g., 6ES7421-1BL01-0AA0).
Q: Is a front connector included?
A: No. The 40-pin front connector (6ES7392-1AM00-0AA0 for screw type or 6ES7392-1BM01-0AA0 for spring type) must be ordered separately. This is standard SIEMENS practice across the S7-300 range.
Q: What is the maximum cable length for field wiring?
A: SIEMENS specifies a maximum of 600 m for unshielded cables and 1,000 m for shielded cables when using 24 V DC sensors, subject to voltage-drop calculations.
Q: Can I mix this module with S7-300 analog modules on the same rack?
A: Yes. S7-300 racks support mixed DI, DO, AI, and AO modules in any slot order (slots 4–11 on a standard rack), subject to total backplane current budget.
Q: Is this module compatible with TIA Portal V17/V18?
A: Yes. The 6ES7321-1BP00-0AA0 is fully supported in TIA Portal V13 through V18 via the SIMATIC S7-300 hardware catalog. No additional GSD file is required.
Q: Do you supply SIEMENS certificates of conformity?
A: Yes, upon request for orders of 3 units or more. Please specify at time of order.
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