Product Description
Siemens 6ES7 321-1BL00-0AA0
The Siemens 6ES7 321-1BL00-0AA0 is a digital input module from the SIMATIC S7-300 series, designed for industrial automation applications. This module, SM 321, provides 32 digital inputs, allowing the PLC to interface with a wide range of sensors, switches, and other binary control signals from the field. It operates on a 24V DC supply and is optically isolated to protect the PLC’s internal circuitry from external electrical disturbances. This module is a reliable and compact solution for expanding the input capabilities of an S7-300 control system, ensuring precise signal acquisition for process monitoring and control.
Technical Specifications:
- Model: SIMATIC S7-300, Digital input SM 321
- Part Number: 6ES7321-1BL00-0AA0
- Number of Digital Inputs: 32
- Input Voltage: 24 V DC
- Isolation: Optically isolated
- Input Characteristic Curve: In accordance with IEC 61131, type 2
- Connection Method: Requires 40-pole front connector
- Dimensions (W x H x D): 40 mm x 125 mm x 120 mm

Siemens 6ES7 321-1BL00-0AA0
Siemens 6ES7 321-1BL00-0AA0 SIMATIC S7-300 digital input module SM 321 with 32 DI, 24V DC, and optical isolation. A compact and reliable solution for expanding PLC inputs in industrial automation systems.











