SIMATIC S7-300 SM321 32-channel 24 V DC input module / 6ES7321-1BL00-0AA0

6ES7321-1BL00-0AA0 is an S7-300 system component documented in the May 2022 equipment manual. Verify the complete ordering code, configuration and supplied revision before selection; the manual does not establish current supply status.

Manufacturer part number: 6ES7321-1BL00-0AA0
Brand: Siemens
Category: PLC and HMI
Catalog status: Request a quotation

Technical specifications

Controller family: SIMATIC S7-300
Module model: SM321
Digital inputs: 32
Rated input voltage: 24 V DC
Electrical isolation grouping: Two groups of 16; do not infer per-channel isolation
Supported signal sources: Switches and 2/3/4-wire proximity switches; check sensor and wiring conditions
Variant scope: Standard 6ES module; SIPLUS 6AG variant is not substituted
Reviewed document edition: 05/2022 / A5E00105505-AK
Document pages: PDF 63 and 64; exact model properties and wiring diagram
Current lifecycle status: Not established by the technical manual; confirm current model lifecycle and supply separately

Manufacturer manual · S7-300 Module data / 05/2022 / A5E00105505-AK · en · PDF · 05/2022 / A5E00105505-AKManufacturer source: Siemens · Model explicitly covered in family document · Covered models: 6ES7321-1BL00-0AA0 · Checked: 2026-10-17Official manufacturer source

This sheet provides a quick technical summary. For design, installation and final selection, review the latest official manufacturer documentation and verify the complete part number.