Emerson LSN20-6TX2SM
Emerson LSN20-6TX2SM
(Emerson DeltaV SIS LSN20 Series 6-Port Safety Network Switch)
1. Product Positioning
The Emerson LSN20-6TX2SM is a Local Safety Network (LSN) hardware module within the Emerson DeltaV SIS (Safety Instrumented System) family.
It is specifically designed for SIL 3 and IEC 61511 safety communication, providing dedicated and redundant channels for secure safety-signal transmission.
2. Key Technical Features
| Item | Description | Reference |
|---|---|---|
| Model | LSN20-6TX2SM (6 ports) – equivalent to LSN20-6TX2MM-ES 6-Port Safety Network Switch | |
| Port Count | Six 10/100 Mbps Ethernet (TX) ports | DeltaV SIS Safety Network Component Datasheet |
| Power Supply | 24 V DC (operating range 18-30 V) | DeltaV SIS Safety Network Component Datasheet |
| Safety Level | SIL 3 certified; compliant with IEC 61511 standards | DeltaV SIS Safety Network Component Datasheet |
| Update Rate | 50 ms cyclic broadcast; I/O response < 300 ms (at 50 ms scan rate) | DeltaV SIS Safety Network Component Datasheet |
| Mechanical Design | DIN-rail mounting; approx. 74 × 131 × 111 mm; weight ≈ 410 g; IP20 protection | DeltaV SIS Safety Network Component Datasheet |
| Redundancy | Supports dual controller (CSL) redundancy; connects up to 15 CSLs, 1 SZ controller, and 1 LSNB | DeltaV SIS Safety Network Component Datasheet |
| EMC & Cabling | Uses shielded Cat5e (ScTP) cables; max link length 100 m; optical fiber recommended beyond 100 m | DeltaV SIS Safety Network Component Datasheet |
| Hazardous Area Certifications | FM (US) Class I Div 2 Groups A-D T4; cFM (Canada); ATEX Ex nA IIC T4 Gc; IECEx Ex nA IIC T4 Gc | DeltaV SIS Safety Network Component Datasheet |
| Plug & Play | “Smart Switch” – no additional configuration required for LSN/GSN operation | DeltaV SIS Safety Network Component Datasheet |
| Compatibility | Supports only Emerson DeltaV SIS optical transceivers and SFP modules; not compatible with third-party transceivers | DeltaV SIS Safety Network Component Datasheet |
3. Typical Application Scenarios
- Industries: Chemical, petrochemical, oil & gas, and pharmaceutical process industries.
- Local Safety Network (LSN): Connects Safety Controllers (CSL) and SZ controllers to enable high-speed, redundant safety signal transmission.
- Global Safety Network (GSN): Interconnects multiple LSNs through LSNB modules to build a distributed safety network.
- Hazardous Areas: With explosion-proof certifications, it can be installed directly in Class I Div 2 control cabinets.
4. Selection & Ordering Guidelines
- Network Topology: Confirm whether a star topology (LSN) or a GSN formed via LSNB is required.
- Software Version: LSN requires DeltaV SIS v12.3 or later; for GSN applications, v13.3 or later and Smart Switch software ≥ 4.2.14 are needed.
- Cabling & Fiber: Use shielded Cat5e for distances ≤ 100 m; use fiber optic transceivers for longer distances or high-EMI environments.
- Explosion Protection: Select models with appropriate certifications (e.g., FM Class I Div 2 T4) based on the hazard zone classification.
Summary
The Emerson LSN20-6TX2SM is a 6-port Ethernet safety switch designed for SIL 3 / IEC 61511 safety-instrumented systems.
It features 24 V DC power, 50 ms update rate, comprehensive hazardous-area certifications, and plug-and-play Smart Switch functionality.
As a core component of the DeltaV SIS Local Safety Network (LSN), it is ideal for process industry applications requiring high reliability and secure signal isolation.
Main Brand:
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About us
SAUL ELECTRIC is a leading supplier specializing in industrial automation, particularly focusing on PLC modules and control systems. With a deep commitment to helping businesses enhance productivity, minimize downtime, and deliver high-quality solutions, SAUL ELECTRIC has become a trusted name in the industry.
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