ABB SD823 I/O communication interface module

The ABB SD823 is a redundant S800 I/O communication interface module used within ABB's IndustrialIT System 800xA and Compact 800 series control systems. It acts as a crucial link, enabling communication between the controller (CPU) and the S800 I/O modules distributed in the field. Its "redundant" nature signifies that it operates in pairs (SD823 and another SD823) to provide enhanced availability and reliability for critical applications.

Product Detailed Description

• Function: The SD823 module's primary function is to serve as the communication interface between the control system's processor (e.g., PM8xx series controller) and the S800 I/O modules. It translates commands from the controller to the I/O modules and transmits process data from the I/O modules back to the controller. When used in a redundant configuration, two SD823 modules operate in parallel, ensuring that if one module fails, the other can seamlessly take over, preventing interruption of communication and control.

• Key Features:

• Redundancy Support: Designed specifically for redundant configurations to maximize system uptime and reliability. Two SD823 modules are installed to provide hot backup.

• S800 I/O Communication: Facilitates data exchange over the S800 I/O bus, which is a high-speed, robust communication link for field devices.

• Hot Swappable: Modules can typically be replaced online without interrupting the process, further enhancing system availability.

• Diagnostic Capabilities: Provides diagnostic information about the communication link and the module's status, aiding in troubleshooting.

• LED Indicators: Equipped with LEDs to indicate operational status, communication activity, and faults.

• Robust Design: Built for industrial environments, ensuring reliable operation in various conditions.

• Part of System 800xA: Integrates seamlessly into the ABB System 800xA architecture, providing a scalable and flexible I/O solution.

Product Parameters

(Note: Specific parameters might vary slightly depending on the exact revision or firmware. Always refer to the official ABB System 800xA S800 I/O Product Manual (typically 3BSE020973-510) for definitive specifications.)

• Module Type: S800 I/O Communication Interface Module (Redundant).

• For use with: PM8xx series controllers (e.g., PM866, PM866A, PM867, PM867A, PM891, PM891K, etc.) and S800 I/O modules.

• Number of S800 I/O Clusters supported: 1 (each SD823 pair controls one I/O cluster).

• Communication with Controller: Via CEX-Bus (Controller Extension Bus).

• Communication with I/O Modules: Via TB8xx Terminal Units and ModuleBus.

• Power Supply:

• Internal power derived from the ModuleBus.

• Nominal Voltage: 24 V DC (system power).

• Current Consumption: Typically low (refer to manual for exact values).

• Heat Dissipation: Low (refer to manual for exact values).

• Operating Temperature: 0 to +55 °C (32 to 131 °F).

• Storage Temperature: -40 to +85 °C (-40 to 185 °F).

• Relative Humidity: 5 to 95% non-condensing.

• Pollution Degree: 2.

• Protection Class: IP20 (when mounted in module termination unit).

• Mounting: Plugs into specific Module Termination Units (MTUs) like TB807, TB840, TB840A.

• Dimensions (W x H x D): Standard S800 I/O module dimensions (refer to manual for exact dimensions, typically around 45 x 115 x 126 mm).

• Weight: Approx. 0.2 kg (0.44 lbs).

• Certifications: CE, UL, cUL, IEC 61131-2, Marine certifications (DNV, GL, LR, etc. - check specific manual).

Product Advantages

• High Availability & Reliability: The primary advantage is its support for redundancy. If one SD823 fails, the redundant partner takes over instantly, minimizing downtime for critical processes.

• Hot Swappability: Allows for online replacement of faulty modules without interrupting plant operations, simplifying maintenance and reducing repair time.

• Seamless Integration: Designed as an integral part of ABB's System 800xA, ensuring compatibility and streamlined engineering.

• Robust Industrial Design: Built to withstand harsh industrial environments, contributing to long-term system stability.

• Enhanced Diagnostics: Provides clear status indications and diagnostic capabilities, facilitating quick identification and resolution of issues.

• Scalability: Supports expansion of I/O points by connecting to S800 I/O modules, offering flexibility for growing systems.

Precautions

• Correct Installation: Always install the SD823 modules into the correct Module Termination Units (MTUs) according to ABB's documentation. Ensure proper seating and locking.

• Redundancy Configuration: For redundant operation, always install two identical SD823 modules (e.g., two SD823) and ensure the control system is correctly configured for redundancy.

• Power Supply Quality: Provide a stable and clean 24 V DC power supply to the S800 I/O racks. Poor power quality can affect module performance and longevity.

• Environmental Conditions: Operate within the specified temperature and humidity limits. Avoid excessive vibration, shock, and corrosive atmospheres.

• ESD Protection: Always follow electrostatic discharge (ESD) precautions when handling the module to prevent damage to sensitive electronic components.

• Firmware Compatibility: Ensure the firmware version of the SD823 is compatible with the controller's firmware and the overall System 800xA version.

• ModuleBus Connection: Ensure the ModuleBus connections between the MTU and subsequent I/O modules are secure and correctly terminated.

Product Applications

The ABB SD823 is primarily used in mission-critical and high-availability industrial automation applications where uninterrupted control and monitoring are essential.

• Process Industries (Oil & Gas, Chemical, Petrochemical):

• Emergency Shutdown Systems (ESD).

• Process Control Systems (PCS) for continuous processes where downtime is costly.

• Safety Instrumented Systems (SIS) - Note: While it supports redundancy for availability, for certified SIS, specific SIL-rated I/O modules and controllers must be used in conjunction.

• Power Generation:

• Control and monitoring of critical plant processes (e.g., boiler control, turbine control).

• Balance of Plant (BoP) control in power plants.

• Mining & Minerals:

• Control of conveyors, crushers, and processing plants where reliability is key.

• Pulp & Paper:

• Control of continuous paper-making processes and chemical recovery.

• Water & Wastewater Treatment:

• Control of critical pumps, valves, and treatment processes to ensure continuous operation.

• Infrastructure:

• Tunnel ventilation systems, traffic control systems where high availability is required.

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