Import 6es7321-1bl00-0aa0 — Buy in wholesale FOB from Supplier in China

The 6ES7321-1BL00-0AA0 is a genuine Siemens SIMATIC S7-300 SM 321 digital input module, manufactured for integration into the S7-300 programmable logic controller platform. It provides 32 optically isolated digital inputs rated at 24V DC, accessed through a single 40-pin front connector (standard Siemens part, not included). The module carries a net weight of 0.664 lb and ships in packaging measuring 5.157 x 5.748 x 2.008 inches, suitable for single-unit international freight. Optical isolation protects the PLC backplane from field-side voltage transients, a standard requirement in industrial environments with inductive loads and long cable runs.

The module housing is metallic, providing electromagnetic shielding and mechanical durability for DIN-rail mounting in control cabinets. The 40-pin front connector supports screw or spring-clamp termination (connector variant ordered separately), with typical cable strain relief and shield bonding options. Input delay times for S7-300 SM 321 modules are typically configurable in ranges from 0.1 ms to 15 ms depending on the specific ordering variant, though the buyer should confirm the exact delay characteristic and diagnostics capability for this part number. The optocoupler-based isolation achieves standard industrial dielectric strength, typically 1500V AC or higher between field and logic circuits.

Primary applications include manufacturing automation, process control, plant maintenance spares, and system expansion in sectors such as automotive assembly, food and beverage processing, pharmaceutical batching, and chemical plant control. Buyers are typically system integrators, OEM automation departments, and maintenance, repair, and operations (MRO) teams managing legacy S7-300 installations. The 6ES7321-1BL00-0AA0 is a mature catalogue part; prospective buyers should verify firmware compatibility with existing CPU and backplane revisions, and confirm whether the 40-pin front connector is bundled or must be sourced separately.

Autowell International Limited is located on Xixiang Street in Baoan District, Shenzhen, Guangdong Province, China. The supplier holds a harbor trust tier on the platform, with a published response rate of 0.00 percent and an average response time of zero hours, indicating that no response data is currently recorded. The listing presents itself as a source for genuine Siemens industrial automation components, specifically positioning the 6ES7321-1BL00-0AA0 as a critical spare part for plant maintenance and system expansion.

The supplier profile does not disclose manufacturing authorisation, inventory holding volumes, in-house testing capability, or after-sales technical support scope. Noien, revenue, employee headcount, or client references are stated. Buyers should verify whether Autowell International Limited holds Siemens distribution or reseller certification, and whether stock is held in Shenzhen or dropshipped from another location. The Baoan District address places the supplier within Shenzhen's established electronics manufacturing and logistics corridor, though this geographic proximity to component supply chains does not alone confirm product provenance.