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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 for S7-300 or PCS 7 automation systems. The module is designed for capturing digital field signals and is especially suitable for industrial applications using NAMUR sensors and 24 V signals. ([SI.SERV GmbH][1])

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 initiators. Integrated diagnostic features such as wire break detection, chatter monitoring, and pulse extension allow for early identification and reporting of faults.
The module has a 40-pin connector and is intended for use in SIMATIC ET 200M or S7-300 systems. It can be used in both centralized control systems and decentralized peripheral structures 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
* Support for NAMUR sensors
* Diagnostic functions (wire break, chatter monitoring, process diagnostics)
* 40-pin connector
* For use in SIMATIC S7-300 / PCS7 / ET200M systems

Typical application areas:

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

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