SIEMENS 6ES7326-2BF10-0AB0 – Safety Digital Output Module SM 326 DO 8×24VDC/2A | SIMATIC S7-300 F-Series
Engineering Background
The 6ES7326-2BF10-0AB0 is a fail-safe digital output module (F-DO) from Siemens’ SIMATIC S7-300 Safety Integrated platform. Designed to meet IEC 61508 SIL 3 and EN 954-1 Category 4 requirements, it provides eight independently monitored 24 VDC / 2 A output channels with integrated short-circuit and overload protection. Each channel is capable of driving actuators such as solenoid valves, contactors, and safety relays directly from the F-CPU without external relay interposing.
Product Positioning
Targeted at process safety, machine guarding, and emergency-stop architectures, the SM 326 DO 8×24VDC/2A is the preferred output stage for procurement engineers who require certified, deterministic control of safety-critical actuators in chemical, oil & gas, automotive, and heavy-industry environments. Konmask.com supplies this module as a verified OEM unit with full traceability documentation available on request.
Complete Technical Specifications
- Part Number: 6ES7326-2BF10-0AB0
- Series / Platform: SIMATIC S7-300, SM 326 F-Series
- Module Type: Fail-Safe Digital Output (F-DO)
- Number of Outputs: 8 channels
- Output Voltage: 24 VDC
- Output Current per Channel: 2 A (max)
- Total Current (all channels): 8 A
- Safety Integrity Level: SIL 3 (IEC 61508)
- Safety Category: Category 4 (EN 954-1 / ISO 13849-1)
- Short-Circuit Protection: Yes, per channel
- Overload Protection: Yes, electronic
- Backplane Bus: S7-300 standard backplane
- Supply Voltage (L+): 24 VDC (20.4 – 28.8 V)
- Current Consumption from Backplane: ≤ 100 mA
- Power Dissipation: Typically 3.5 W
- Dimensions (W × H × D): 40 × 125 × 120 mm
- Weight: Approx. 320 g
- Operating Temperature: 0 °C to +60 °C
- Storage Temperature: −40 °C to +70 °C
- Degree of Protection: IP 20
- Certifications: CE, UL, cUL, FM, ATEX (Zone 2)
- Compatible F-CPUs: 6ES7315-2FJ14-0AB0, 6ES7317-2FK14-0AB0, 6ES7318-3FL01-0AB0
- MLFB / Order Number: 6ES7326-2BF10-0AB0
Proven Application Environments
- Emergency Stop (E-Stop) Circuits: Direct actuation of safety relays and contactors in SIL 3 E-stop loops
- Process Safety Shutdown (SIS): Solenoid valve control for ESD and HIPPS systems in oil & gas and chemical plants
- Machine Guarding: Light curtain and safety gate interlock output stages in automotive press and robotic cells
- Burner Management Systems (BMS): Fuel valve actuation with certified fail-safe de-energization
- Conveyor & Material Handling: Drive enable/disable outputs with integrated diagnostics for high-availability lines
- Pharmaceutical & Food Processing: Hygienic-area actuator control with full audit-trail diagnostics via STEP 7 Safety
Engineering Advantages
- Integrated Diagnostics: Channel-level short-circuit, wire-break, and overload detection reported directly to the F-CPU via PROFIsafe
- No External Relay Required: 2 A per channel eliminates interposing relay panels, reducing BOM cost and panel footprint
- Hot-Swap Capable: Module replacement without powering down the rack (with appropriate F-CPU firmware)
- Deterministic Response Time: Watchdog-monitored output update cycle ensures predictable safety reaction time
- Compact Form Factor: Single-slot 40 mm width maximizes rack density in space-constrained cabinets
- Unified Engineering: Fully programmed and parameterized within STEP 7 Safety Advanced / TIA Portal Safety — no separate safety tool required
System Architecture & Signal Flow
The 6ES7326-2BF10-0AB0 communicates with the F-CPU over the S7-300 backplane bus using the PROFIsafe safety protocol. The F-CPU transmits a signed, CRC-protected output frame to the module. The module’s internal dual-channel output driver validates the frame, checks the watchdog timer, and energizes or de-energizes each output channel accordingly. In the event of a communication timeout, CRC mismatch, or internal hardware fault, all outputs are forced to the safe state (de-energized) within the module’s configured F-monitoring time.
Signal path: F-CPU → Backplane Bus (PROFIsafe) → SM 326 F-DO → Output Terminal → Field Actuator
Sourcing & Quality Verification
- Origin: Genuine Siemens OEM hardware, manufactured in Germany
- Traceability: Each unit carries a Siemens factory serial number; batch certificates available on request
- Inspection: Pre-shipment functional test performed on Konmask.com’s in-house S7-300 test rack
- Packaging: Original Siemens anti-static packaging with tamper-evident seal
- Warranty: 12-month Konmask.com warranty; Siemens OEM warranty terms apply where applicable
- Export Compliance: ECCN classification confirmed; export documentation provided for international orders
Procurement Process
- Add the 6ES7326-2BF10-0AB0 to your cart or submit a purchase order (PO) via email to support@konmask.com
- Receive a proforma invoice with lead time confirmation within 1 business day
- Payment via T/T bank transfer, PayPal, or approved credit terms for qualified accounts
- Shipment via DHL Express / FedEx Priority with full tracking and commercial invoice
- Post-delivery technical support available via email or WhatsApp: +0086 19859288691
Technical FAQ
Q: Is the 6ES7326-2BF10-0AB0 compatible with TIA Portal?
A: Yes. The module is supported in TIA Portal V13 SP2 and later with the STEP 7 Safety Advanced option package. HSP (Hardware Support Package) installation may be required for older TIA Portal versions.
Q: Can this module be used with a standard (non-F) S7-300 CPU?
A: No. The SM 326 F-DO requires an F-CPU (e.g., CPU 315F, 317F, or 319F) to activate its safety functions. It will not operate in safety mode with a standard CPU.
Q: What is the maximum cable length to the field actuator?
A: Siemens specifies a maximum cable capacitance of 200 nF per channel. For 24 VDC cables, this typically corresponds to approximately 200–400 m depending on cable type.
Q: How do I replace the module without losing the safety program?
A: The safety program and F-parameters reside in the F-CPU, not the module. After physical replacement, perform a module acceptance test in STEP 7 Safety / TIA Portal Safety to re-validate the new module’s hardware signature.
Q: Does Konmask.com provide a test report?
A: Yes. A functional test report from our in-house S7-300 test rack is available upon request at no additional charge.
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Contact: support@konmask.com | +0086 19859288691
