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

Siemens SIMATIC S7 module 6ES7 321-7TH00-0AB0 (SM 321) is a digital input module designed for S7-300 or PCS 7 automation systems. This module captures 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, this module ensures reliable processing of switching states from sensors, contacts, or initiators. Thanks to integrated diagnostic features such as wire-break detection, chatter monitoring, and pulse extension, faults can be quickly detected and reported.
The module offers a 40-pin connector and is intended for use with SIMATIC ET 200M or S7-300 systems. It can be deployed both in central control systems and decentralized peripheral structures via PROFIBUS or PROFINET. ([SI.SERV GmbH][1])

Technical specifications:

* 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, chatter monitoring, process diagnostics)
* 40-pin connector
* For use in 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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