Siemens 6ES7321-1BL00-0AA0 SIMATIC S7-300, Digital input SM 321, Isolated 32 DI

Description:

The Siemens 6ES7321-1BL00-0AA0 Digital Input Module is an industrial I/O module designed for SIMATIC S7-300 PLC systems to provide reliable digital signal acquisition. This module features thirty-two isolated digital input channels, allowing the PLC to monitor signals from field devices such as switches, sensors, and pushbuttons. Maintenance teams, OEM machine builders, and system integrators use this module for system expansion, control panel upgrades, machine automation projects, and replacement of existing digital input modules in industrial automation environments.

Applications:

The 6ES7321-1BL00-0AA0 module is widely used in industrial automation systems where multiple digital inputs must be monitored reliably. Typical installations include manufacturing production lines, packaging machinery, conveyor systems, robotics, and material handling equipment where PLCs must read signals from limit switches, proximity sensors, safety devices, and operator controls.

Technical Specifications:

• Manufacturer: Siemens
• Part Number: 6ES7321-1BL00-0AA0
• Series: SIMATIC S7-300
• Module Type: Digital input module
• Number of Inputs: 32 digital inputs
• Input Type: Isolated digital inputs
• Input Voltage: 24V DC
• Signal Type: Sink/source compatible (depending on wiring)
• Installation Type: S7-300 rack-mounted module
• Communication Interface: Backplane bus
• Compatible Controllers: SIMATIC S7-300 PLC systems
• Operating Temperature: 0°C to 60°C

Common Replacements:

• Siemens 6ES7321-1BL00-0AA1
• Siemens 6ES7321-1BH02-0AA0
• Schneider 140DDI35300