Siemens 6ES7321-7RD00-0AB0 Digital Input Module

Product manual:

Siemens 6ES7321-7RD00-0AB0 is a digital input module designed for the S7-300 series, specifically for NAMUR sensors. It has 8 input channels and supports intrinsic safety signal acquisition in hazardous areas.
Main technical specifications:
Number of input channels: 8 digital inputs
Input type: Suitable for NAMUR sensors
Input delay: 4 to 20 ms (adjustable)
Isolation voltage: 500V (isolation between input and backplane bus)
Protection level: IP20
Functional features:
NAMUR sensor support: specifically designed to connect with NAMUR sensors (commonly used in hazardous areas), capable of collecting safety signals from the sensors.
8-channel input: Provides 8 independent digital input channels, suitable for application scenarios that require high reliability and security.
Short circuit and open circuit detection: The module supports short circuit and open circuit detection to ensure the integrity and safety of signal lines.
Electrical isolation: There is 500V isolation between the input signal and the backplane bus to ensure the electrical safety and stability of the system.
Signal status indication: equipped with LED status indicator lights, making it easy for users to monitor the status of each input channel in real time.
Safety certification: This module complies with the intrinsic safety standards for use in hazardous areas and is suitable for high-risk industries such as petroleum and chemical.

Product details picture:

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