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:
ABB Allen-Bradley Alstom Bently Emerson Foxboro
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•Package: Original packing with cartons
Regarding DCS
A Distributed Control System (DCS) is a computer-based system used to automate, monitor and control complex industrial processes. It is essentially a large network of controllers that are distributed throughout a plant or facility, all working together to keep the process running smoothly.
Here’s a breakdown of how a DCS system works:
1. Sensors:These devices collect data from the physical process, such as temperature, pressure, flow rate, and level.
2. Controllers:These are programmable devices that receive data from the sensors and send control signals to actuators.
3. Actuators:These devices take physical action based on the signals they receive from the controllers, such as opening or closing valves, starting or stopping pumps, or adjusting heater settings.
4. Operator stations:These are the human-machine interfaces (HMI) that allow operators to monitor the process, make changes to setpoints, and troubleshoot problems.
5. Communication network:This network connects all of the devices in the DCS system together, allowing them to share data and control signals.
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