It features high reliability, high security, and strong environmental adaptability, and is tailor-made for safety communication requirements in industrial automation. It can be seamlessly integrated into the DeltaV SIS system to guarantee the stable performance of safety instrumented functions. It is widely used in industries with extremely high production safety requirements, such as petroleum, chemical, power generation, and pharmaceuticals.As a key component of the DeltaV SIS system, it works in coordination with intelligent logic solvers, carrier extension cables and other equipment to build a dedicated safety communication network. It avoids the risk of common cause failures between the control network and the safety network at the hardware level, providing a solid guarantee for the safe and stable operation of industrial production.

Technical Specifications

• Basic ParametersBrand: EmersonModel: KJ2221X1-BA1Product Type: Dedicated network repeater for DeltaV SISNET
  Customization: Standard product, customization not supportedWeight: Approx. 500g
  Dimensions: Approx. 10cm × 5cm × 2cm (slight variations may exist in different documents; refer to the official manual for accuracy)
• Power ParametersPrimary power supply: 24VDC, power consumption approx. 300mA.Some applications support 110V–240V AC input.According to some documents, maximum power input supports 10–240VDC, enabling flexible adaptation to on-site industrial power environments with strong power stability to ensure continuous operation.
• Communication PerformanceSupports the SISNET dedicated safety communication protocol and integrates optical fiber communication interfaces.Transmits only safety-critical signals and does not carry control network data, preventing control network faults from affecting safety communication.Data update time: ≤50ms, ensuring safety signal synchronization among all nodes within 50ms.Combined with the speed of logic solvers, the I/O response time at any location in the distributed SISNET network is guaranteed to be less than 225ms.Supports redundant ring architecture:
• Single ring supports up to 32 nodes
• Maximum distance between nodes: 2km
• Maximum ring circumference: 64kmWith SISNET range extenders, inter-node distance can exceed 60km and total transmission distance up to 1920km, while maintaining a 50ms data update rate.
• Environmental AdaptabilityOperating temperature: -40°C to 85°C (some documents list 0°C~55°C or -20°C~60°C; subject to official standards).Suitable for harsh industrial environments including high and low temperatures.Storage temperature: -40°C~80°CRelative humidity: 5%~95%Features strong anti-interference capability, resisting electromagnetic interference and vibration in industrial sites to ensure stable signal transmission.
• Accuracy & ResponseAnalog signal transmission accuracy: 0.1% of full scale.Signal response time as fast as 1 millisecond.Suitable for real-time control applications, enabling accurate transmission of safety-critical control signals and ensuring timely execution of control commands.

Functional Features

• Dedicated Safety Communication to Eliminate Common Cause FailuresAdopts the SISNET dedicated safety network, which only carries safety-rated signals and is completely isolated from the control network. This fundamentally avoids impacts on safety communication caused by control network faults, ensuring reliable transmission of safety-critical trip signals, interlock signals, etc. It complies with design specifications for industrial safety instrumented systems and guarantees safe redundancy in the production process.
• Signal Repeater and Range ExtensionIts core function is to amplify and repeat safety signals in the SISNET network, solving signal attenuation during long-distance transmission and expanding the coverage of the safety network. It extends the communication range from local logic solvers to remote logic solvers, enabling synchronized transmission of safety signals across large-scale and geographically dispersed industrial scenarios, suitable for large chemical plants, oil fields and other physically distributed production facilities.
• Redundant Design for Improved ReliabilityAdopts dual independent redundancy. Each carrier is equipped with primary and backup SISNET repeaters to form a redundant backup mechanism. If the primary unit fails, the backup switches over seamlessly to prevent safety network interruption due to single-point failure. It also supports channel-to-channel isolation and channel-to-ground isolation to avoid signal interference and ground loop issues, further enhancing system reliability and stability to meet high-availability requirements of industrial safety systems.
• Fast Response and Real-Time MonitoringA 50ms data update time ensures real-time synchronization of safety signals among all nodes, enabling rapid transmission and response of interlock commands, fault alarms and other signals. Built-in diagnostic functions allow real-time monitoring of module status and signal transmission quality, timely detecting faults and abnormalities for quick troubleshooting and reducing system downtime risks. It supports the HART communication protocol for remote configuration and diagnostics, improving equipment maintenance efficiency.
• Flexible Installation for Various Deployment ScenariosFeatures a compact design for easy installation and maintenance, and can be mounted on standard T-type DIN rails for DeltaV SIS systems. Supports both horizontal and vertical installation:
• Horizontal: 2-wide carrier, can be inserted anywhere between SIS controller carriers or logic solver carriers
• Vertical: 4-wide carrier, installed at the top of vertical systemsThe carrier provides direct pass-through connections for rail bus signals and power, and can be directly reused when installing DeltaV I/O cards, adapting to diverse on-site industrial installation requirements.

Applications

• Petrochemical IndustryLarge-scale refineries, oil fields, natural gas processing plants, etc. These sites feature complex production processes and geographically dispersed layouts, requiring cross-regional transmission of safety interlock signals and emergency trip signals. KJ2221X1-BA1 extends the safety network range and ensures reliable long-distance signal transmission, preventing safety incidents such as leaks and explosions caused by signal interruptions.
• Power IndustryThermal power plants, nuclear power plants, substations, etc. It is used for network expansion of safety instrumented systems, transmitting safety monitoring signals and control commands for key equipment such as boilers and steam turbines, ensuring safe and stable power production and avoiding power outages or accidents caused by equipment failures.
• Pharmaceutical IndustryPharmaceutical manufacturing demands extremely high process precision and safety. KJ2221X1-BA1 guarantees accurate signal transmission for safety instrumented systems, enabling safe monitoring and interlock control of reactors, pipelines and other equipment. It meets pharmaceutical industry safety and compliance requirements, reducing potential hazards and quality risks during production.
• Other Industrial ScenariosManufacturing, water treatment, energy management and other fields. The product is suitable for any scenario involving distributed deployment of DeltaV SIS systems that requires safety network expansion and reliable transmission of safety-critical signals, including CNC machine tools, robot control, water treatment pump and valve control, etc., providing safe communication support for industrial automation systems.

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