SIMATIC S7-300 SM321 16-channel 48 to 125 VDC digital input / 6ES7321-1CH20-0AA0

6ES7321-1CH20-0AA0: S7-300 signal module documented in its own section of the May 2022 equipment manual. Verify complete ordering code, hardware revision, host compatibility and installation limits. Historical technical evidence does not establish current lifecycle, stock or Iran demand.

Manufacturer part number: 6ES7321-1CH20-0AA0
Brand: Siemens
Category: PLC and HMI
Catalog status: Request a quotation

Technical specifications

Controller family: SIMATIC S7-300
Digital inputs: 16 x 48 to 125 VDC
Isolation groups: 2 groups of 8 inputs
Dimensions (W x H x D): 40 x 125 x 120 mm
Weight: Approximately 200 g
Source scope: Page96 upper table belongs to the preceding UC24/48V model and is not adopted.
Reviewed document edition: 05/2022 / A5E00105505-AK
Document pages: PDF 96, 97
Current lifecycle status: Not established by historical equipment manual; confirm lifecycle and supply separately
Module notes: Verify complete order code, hardware revision, host compatibility and installation requirements; SIPLUS order codes are separate products

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: 6ES7321-1CH20-0AA0 · Checked: 2026-10-22Official 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.