Functional Safety Solution – SIEMENS 6ES7326-1BK01-0AB0 | S7-300 F-Series Safety Digital Input Module
The SIEMENS 6ES7326-1BK01-0AB0 is a 24-channel safety-rated digital input module designed for the SIMATIC S7-300 Fail-Safe (F) controller platform. It enables engineers to integrate safety-critical field signals — such as emergency stops, light curtains, and safety door switches — directly into a certified safety PLC architecture, achieving up to SIL 3 (IEC 62061) and Category 4 / PL e (EN ISO 13849-1) without external safety relays.
Where This Product Is Used
This module is specified across a wide range of safety-critical industrial environments:
- Machinery & Robotics Safety: Monitoring E-stop buttons, two-hand controls, and safety light curtains on automated assembly lines and robotic cells. Eliminates the need for standalone safety relay modules by integrating directly into the F-CPU safety program.
- Oil & Gas / Petrochemical Plants: Acquiring SIL-rated field signals from pressure switches, flame detectors, and gas detection systems in hazardous areas. Supports SIS (Safety Instrumented System) architectures per IEC 61511.
- Chemical & Pharmaceutical Processing: Monitoring reactor interlocks, agitator guards, and emergency shutdown (ESD) triggers. Complies with GMP-aligned safety documentation requirements.
- Automotive Manufacturing: Press safety, conveyor guarding, and transfer line interlocks where high-channel-count safety input acquisition is required in a compact DIN-rail form factor.
- Power Generation & Utilities: Turbine protection, boiler safety interlocks, and substation control panels requiring certified safety-grade digital inputs.
- Food & Beverage: Guarding on filling lines, packaging machines, and palletizers where washdown-resistant field devices feed safety signals into the control system.
- Water & Wastewater Treatment: Pump protection interlocks and overflow/dry-run detection in distributed safety architectures.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 6ES7326-1BK01-0AB0 |
| Series | SIMATIC S7-300 F (Fail-Safe) |
| Module Type | Safety Digital Input (F-DI) |
| Number of Inputs | 24 DI (configurable as 12 × 2-channel safety pairs) |
| Input Voltage | 24 V DC |
| Input Current (per channel) | Approx. 6 mA |
| Safety Integrity Level | SIL 3 per IEC 62061 |
| Performance Level | PL e per EN ISO 13849-1 |
| Safety Category | Category 4 |
| Backplane Bus | S7-300 parallel backplane bus |
| Dimensions (W × H × D) | 40 × 125 × 120 mm |
| Weight | Approx. 230 g (module only) |
| Operating Temperature | 0 °C to +60 °C |
| Storage Temperature | −40 °C to +70 °C |
| Degree of Protection | IP 20 |
| Certifications | CE, UL, cUL, ATEX (Zone 2), TÜV |
| Firmware | Compatible with STEP 7 Safety Advanced / TIA Portal Safety |
Why Engineers Specify This Model
- Integrated Safety Architecture: Eliminates external safety relay panels by processing safety logic directly in the F-CPU, reducing wiring complexity and panel footprint by up to 40%.
- High Channel Density: 24 inputs in a single 40 mm-wide module — one of the highest channel densities available in the S7-300 F range — minimizing rack space and hardware cost.
- Dual-Channel Evaluation: Supports 1oo2 (1-out-of-2) sensor evaluation for maximum fault detection, meeting Category 4 / PL e requirements without additional hardware.
- Discrepancy Monitoring: Configurable discrepancy time for dual-channel inputs detects sensor faults before they cause spurious trips, improving plant availability.
- Proven Certification Pedigree: TÜV-certified and widely accepted by safety authorities globally, simplifying functional safety documentation (FSA) and third-party audits.
- Seamless STEP 7 / TIA Portal Integration: Fully supported by Siemens engineering tools with pre-certified F-blocks (F-FBs), reducing safety program development time.
- Long-Term Availability: Established S7-300 platform with broad spare-parts ecosystem — critical for brownfield plants with 10–20 year maintenance horizons.
Complete System Bill of Materials
A typical S7-300 F safety system incorporating the 6ES7326-1BK01-0AB0 includes:
- F-CPU: 6ES7315-2FJ14-0AB0 (CPU 315F-2 PN/DP) or 6ES7317-2FK14-0AB0 (CPU 317F-2 DP)
- Power Supply: 6ES7307-1EA01-0AA0 (PS 307, 5 A) or 6ES7307-1KA02-0AA0 (PS 307, 10 A)
- Rack: 6ES7390-1AE80-0AA0 (UR1, 18-slot) or 6ES7390-1AF30-0AA0 (UR2, 9-slot)
- Safety Digital Output: 6ES7326-2BF41-0AB0 (F-DO, 10 × 24 V DC / 2 A)
- Front Connector: 6ES7392-1BM01-0AA0 (40-pin screw terminal)
- Labeling Strip: 6ES7392-2XX00-0AA0
- PROFIBUS DP Cable: 6XV1830-0EH10 (per meter, shielded)
- SIMATIC S7 Memory Card: 6ES7953-8LJ31-0AA0 (for CPU firmware/program backup)
Compliance & Industry Standards
- IEC 62061: Safety of machinery — Functional safety of electrical, electronic and programmable electronic control systems (SIL 3)
- EN ISO 13849-1: Safety of machinery — Safety-related parts of control systems (PL e, Category 4)
- IEC 61508: Functional safety of E/E/PE safety-related systems (SIL 3 capable)
- IEC 61511: Functional safety — Safety instrumented systems for the process industry sector
- ATEX Directive 2014/34/EU: Zone 2 rated (with appropriate field barriers)
- UL 508 / cUL: Industrial control equipment (North American market)
- CE Marking: EMC Directive 2014/30/EU, Low Voltage Directive 2014/35/EU
- TÜV Rheinland Certified: Independent third-party safety certification
Quality Assurance & Sourcing
At Konmask.com, every SIEMENS 6ES7326-1BK01-0AB0 unit is subject to a rigorous multi-stage verification process before dispatch:
- Authenticity Verification: Each module is inspected against Siemens OEM packaging standards, holographic labels, and date codes. Counterfeit units are rejected at intake.
- Functional Pre-Check: Modules are powered and backplane-tested where applicable to confirm LED status and communication integrity.
- Traceability: Full supply chain documentation available on request, including distributor certificates of conformance (CoC).
- Condition Grading: Units are clearly graded as New (factory-sealed), Refurbished (tested & recertified), or Surplus (unused, open box) — no ambiguity.
- Warranty: 12-month replacement warranty on all units. Safety-critical applications are supported with expedited RMA processing.
- Export Compliance: All orders processed in accordance with applicable export control regulations (EAR/ECCN).
How to Source This Part
- Confirm Your Requirement: Verify the exact part number (6ES7326-1BK01-0AB0) against your existing rack configuration and STEP 7 / TIA Portal project hardware catalog.
- Check Firmware Compatibility: Confirm the firmware version required by your F-CPU. Contact us if you need a specific firmware revision.
- Request a Quote: Email support@konmask.com with your quantity, required condition grade, and delivery timeline.
- Review Documentation: We provide datasheet, wiring diagram, and CoC upon request before order confirmation.
- Place Order & Track: Orders are processed within 1 business day. DHL / FedEx express shipping available worldwide with full tracking.
- Post-Delivery Support: Our engineering team is available for commissioning guidance, STEP 7 configuration questions, and warranty claims.
Application-Specific FAQ
Q: Can the 6ES7326-1BK01-0AB0 be used with a standard (non-F) S7-300 CPU?
A: No. F-modules require an F-capable CPU (e.g., CPU 315F, 317F, 319F) and the STEP 7 Distributed Safety or S7 F Systems add-on. They cannot be addressed by standard OBs in a non-F CPU.
Q: How many safety pairs does this module provide?
A: The 24 inputs can be configured as up to 12 dual-channel (1oo2) safety input pairs, each independently evaluated for discrepancy and short-circuit faults.
Q: Is this module suitable for ATEX Zone 1 hazardous areas?
A: The module itself is rated for Zone 2 (non-sparking). For Zone 1 applications, Zener barriers or galvanic isolators (e.g., PEPPERL+FUCHS or MTL) must be installed between the field device and the module input terminals.
Q: What is the maximum cable length for field wiring to this module?
A: Siemens recommends a maximum of 200 m for 24 V DC digital inputs under standard EMC conditions. Shielded cable is recommended for runs exceeding 30 m or in high-noise environments.
Q: Can I mix F-DI and standard DI modules in the same S7-300 rack?
A: Yes. F-modules and standard I/O modules can coexist in the same rack. F-modules occupy dedicated slots and are addressed separately in the safety program.
Q: What is the typical lead time for this part?
A: In-stock units ship within 1–3 business days. For large quantities or specific firmware versions, lead time is 5–10 business days. Contact us for urgent requirements.
Q: Do you provide a Siemens Certificate of Conformance?
A: Yes, for new factory-sealed units. For surplus/refurbished stock, we provide our own inspection certificate. Siemens OEM CoC is available for units sourced directly from authorized distribution channels.
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