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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 capturing digital field signals and is particularly suitable for industrial applications with NAMUR sensors and 24 V signals. ([SI.SERV GmbH][1])

Featuring 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 functions such as wire break detection, debounce monitoring, and pulse extension allow for early detection 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 deployed both in central control systems and in decentralized peripheral structures via PROFIBUS or PROFINET. ([SI.SERV GmbH][1])

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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, debounce monitoring, process diagnostics)
* 40-pin connector
* Suitable for SIMATIC S7-300 / PCS7 / ET200M systems

Typical application areas:

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

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