Siemens SIMATIC S7-300 16-Point Digital Input Module

Description

The 6ES7321-1BH02-0AA0 is a digital input module for the Siemens SIMATIC S7-300 PLC system. It is engineered to read 16 digital signals at 24V DC. With optical isolation, it ensures signal integrity and protects the PLC's backplane from electrical noise and disturbances in the field, making it a dependable choice for a wide range of industrial automation applications.

Specifications

• Manufacturer: Siemens
• Product Series: SIMATIC S7-300
• Model: SM 321
• Part Number: 6ES7321-1BH02-0AA0
• Number of Inputs: 16
• Input Type: Digital (DC)
• Input Voltage: 24V DC
• Isolation: Optically Isolated
• Connector Required: 20-pole (sold separately)

Label Info

• E-Stand: 3
• Made in Germany

Application

This module is ideal for interfacing with sensors, switches, push buttons, and other binary control devices in manufacturing lines, process control systems, and machine automation.

Country of Origin

This product is proudly manufactured in Germany by Siemens AG.

CO2 Impact

Opting for this pre-owned module instead of a new one prevents the emission of approximately 8.0 kg of CO2, contributing to a more sustainable industrial environment.

Availability

This item is an obsolete but readily available spare part for existing S7-300 systems. Order now from PLC2Day for expert support and fast delivery.

FAQ

The standard input delay is typically 3 ms. It can be parameterized to different values like 0.1, 0.5, 3, 15, or 20 ms using STEP 7 software, allowing adaptation to various sensor types and process speeds.

No, the 6ES7321-1BH02-0AA0 is a standard digital input module. For safety-related applications, you must use dedicated Siemens Safety Integrated modules, identifiable by an 'F' in their model name, such as an F-DI module.

This module requires a 20-pole front connector. Common part numbers are 6ES7392-1AJ00-0AA0 (screw terminals) or 6ES7392-1BJ00-0AA0 (spring-loaded terminals). Typically, these connectors are sold separately and are not included with the module itself.

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Last Update: Friday, March 13, 2026