Description
Unboxing & Hardware Overview
- Manufacturer & Architecture: Siemens AG (SIMATIC S7-300 / Distributed Safety Automation Platform)
- Part Number / Model: 6ES7326-1BK02-0AB0 (Catalog Designation: SM 326 Failsafe Digital Input Module, F-DI 24 x DC 24V)
- Product Type: High-Density 24-Channel Fail-Safe Digital Input Module
- Physical Dimensions: Standard SIMATIC S7-300 double-wide module format (Approx. 80 x 125 x 120 mm)
- Estimated Shipping Weight: ~0.7 lbs (0.32 kg) enclosed in industrial anti-static ESD shielding and structural protective foam packaging
- Primary Condition Status: Factory New / New Surplus / Certified Refurbished options available (verify specific hardware revision tiers and safety lifecycle parameters with provider prior to dispatch)
Product Introduction
The Siemens SIMATIC S7-300 SM 326 (6ES7326-1BK02-0AB0) is a high-density, fail-safe digital input module engineered for critical safety-instrumented systems (SIS) within the SIMATIC S7 F/FH Systems and ET 200M distributed architectures.
Providing 24 fail-safe digital inputs operating at 24V DC, this module is designed to monitor safety sensors, emergency stop pushbuttons, safety gates, and light curtains. It executes continuous onboard self-diagnostics, short-circuit monitoring, and signal discrepancy evaluations, allowing industrial plants to achieve the highest safety integrity levels (SIL 3) for emergency shutdown (ESD) and safety interlock applications.
Core Technical Specifications
| Parameter | Value |
| Product Model | 6ES7326-1BK02-0AB0 (SM 326 F-DI 24 x DC 24V) |
| System Compatibility | SIMATIC S7-300 Failsafe (F) Systems / ET 200M distributed safety configurations |
| Module Type | Fail-Safe Digital Input Module |
| Input Channels | 24 Fail-Safe Digital Inputs (DI) for 24 V DC |
| Safety Integrity Level | Up to SIL 3 (IEC 61508) / Cat. 4 (EN 954-1 / ISO 13849-1) |
| Diagnostic Functions | Integrated wire-break, short-circuit to M/L+, and channel discrepancy monitoring |
| Front Connector Interface | 1 x 40-pole secure front terminal connection block |
| Operating Temperature | 0°C to +60°C (32°F to 140°F) standard panel mount range |
| Storage Temperature | -40°C to +85°C (-40°F to 185°F) |
| Relative Humidity | Up to 95% non-condensing |
Compliance & Standards Alignment
- Certified for functional safety applications up to SIL 3 in accordance with IEC 61508 and Category 4 / PL e under EN 954-1 / ISO 13849-1.
- Manufactured to meet strict international CE, UL, cUL, and industrial electromagnetic compatibility (EMC) regulations for process control environments.
Technical Note: Because the SM 326 processes safety-critical signals across 24 channels, correct sensor evaluation configurations (1-out-of-2 vs. 2-out-of-2 structures) must be assigned cleanly in the SIMATIC Safety engineering software. Ensure that discrepancy times match field device switching characteristics to avoid nuisance safety trips.
Storage & Asset Preservation Guidelines
- Store the failsafe module inside its original antistatic ESD shielding bag to protect internal redundant microcontrollers and safety isolation barriers from electrostatic discharge.
- Maintain clean, dry, temperature-controlled warehouse environments where relative humidity is kept strictly below 60%.
- Avoid mechanical shocks, drops, or placing heavy weights on the module box to prevent backplane pin damage or front connector deformation.
Physical Installation Prerequisites
- Ensure that all control rack power supplies and external safety loop circuits are completely de-energized and locked out (LOTO) prior to physical handling or mounting.
- Mount the module securely onto the standard S7-300 DIN profile rail and pivot downward to engage the backplane bus connectors cleanly.
- Secure the front retention screws completely and ensure that safety field wiring is segregated from standard, non-safety control cables to eliminate electromagnetic cross-talk.
Buyer’s FAQ & Logistics
Q: What Harmonized System (HS) code applies to this Siemens safety input card?
A: Industrial programmable controller input modules, safety electronics, and electrical control apparatus parts typically classify under HS code 8538.90 (Parts suitable for use solely or principally with control apparatus). Confirm exact details with your customs broker.
Q: Does part number 6ES7326-1BK02-0AB0 include the 40-pole front connector?
A: No. Standard Siemens S7 modules ship without front terminal blocks; a dedicated 40-pole front connector (screw or spring-clamp variant) must be ordered separately.
Q: Is the listed online price final for procurement?
A: Note: Price is subject to market availability, safety inventory tiers, and lifecycle status; contact our technical sales desk for a formal, time-sensitive quotation.
