Control unit

Siemens Simatic S7-300 Digital Input

The Siemens 6ES7 326-1BK02-0AB0 is a fail-safe digital input module from the SIMATIC S7-300 series (SM 326). This unit is designed for reliable acquisition of digital signals in safety-related automation systems and is typically used in machine and plant control applications. The module processes 24 digital input signals at 24 V DC and includes diagnostic and safety features to ensure dependable plant operation. ([Industrie Mall][1])

With its integrated Safety Integrated technology, the module meets strict safety requirements up to Category 4 according to EN 954-1, SIL3 under IEC 61508, and Performance Level e to ISO 13849. This makes the unit particularly suitable for safety-critical applications such as emergency stop circuits, safety door monitoring, and interlock systems. ([Industrie Mall][1])

The module features a 40-pin interface and can be deployed either centrally in S7-300 controllers or decentrally in ET 200M systems via PROFIBUS or PROFINET. Integrated diagnostic functions enable early detection of faults or signal errors, which are communicated directly to the controller. ([TURLL Automation][2])

Technical Data:

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* Type: Digital input module SM 326 F-DI
* Article number: 6ES7 326-1BK02-0AB0
* 24 digital inputs
* Input voltage: 24 V DC
* Fail-safe version (Safety Integrated)
* Diagnostic alarm and safety monitoring
* Safety level: SIL3 / PL e / Category 4
* Interface: 1× 40-pin
* Compatible with SIMATIC S7-300 and ET 200M

Typical Areas of Application:

* Safety-oriented machine control systems
* Emergency stop and safety circuits
* Plant and process automation
* Industrial installations with safety-relevant sensors

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