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Siemens Simatic S7 6ES7 321-7TH00-0AB0

The Siemens SIMATIC S7 module 6ES7 321-7TH00-0AB0 (SM 321) is a digital input module for S7-300 or PCS 7 automation systems. This module is designed for acquisition of digital field signals and is particularly suitable for industrial applications using NAMUR sensors and 24 V signals. ([SI.SERV GmbH][1])

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Equipped with 16 digital inputs (DI) and an operating voltage of 24 V DC, the module enables reliable processing of switching states from sensors, contacts, or actuators. Integrated diagnostic functions such as wire break detection, bounce monitoring, and pulse extension allow for early detection and reporting of system faults.
The module features a 40-pin connection and is intended for use in SIMATIC ET 200M or S7-300 systems. It can be deployed in both central control systems and decentralized peripherals via PROFIBUS or PROFINET. ([SI.SERV GmbH][1])

Technical Features:

* Type: Digital Input Module SM 321
* Article number: 6ES7 321-7TH00-0AB0
* 16 digital inputs (DI)
* Input voltage: 24 V DC
* Supports NAMUR sensors
* Diagnostic functions (wire break, bounce monitoring, process diagnostics)
* 40-pin connection
* For use with SIMATIC S7-300 / PCS7 / ET200M systems

Typical Applications:

* Mechanical and plant engineering
* Process automation
* Industrial plants with sensor and switching signals
* Integration into Siemens SIMATIC automation systems

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