Description
ABB SB822 3BSE018172R1
I. Overview
ABB SB822 3BSE018172R1 is a high-performance safety bridge module, with its core positioning as a signal isolation, conversion and bidirectional transmission unit between the safe and non-safe sides of automation systems. It belongs to ABB's safety control product series and is specially designed for scenarios with stringent functional safety requirements, such as petrochemical, electric power and metallurgical industries. As a key connecting component between the safety loop and the standard control loop, this module can realize the isolated transmission and bidirectional interaction of 4-20mA analog signals and dry contact switch signals. It has obtained SIL 2 functional safety certification and integrates real-time fault diagnosis and status feedback functions. It can effectively block fault propagation, resist electromagnetic interference, and provide reliable signal transmission guarantee for safety loops such as Emergency Shutdown (ESD), safety door monitoring and overload protection, serving as a core component to ensure the safe and stable operation of industrial control systems.
II. Core Features
Bidirectional Transmission of Multi-type Signals: Compatible with 4-20mA analog signals and dry contact (NO/NC) switch signals, supporting bidirectional signal interaction between the safe and non-safe sides. It can be directly adapted to sensors, actuators, PLCs and other equipment without additional adapter modules, simplifying loop design and improving signal transmission efficiency and accuracy.
Real-time Fault Diagnosis and Feedback: Equipped with a complete built-in fault detection circuit, it can monitor faults such as signal disconnection, short circuit, overvoltage and power supply abnormality in real time. It intuitively feeds back the operating status through status indicator lights (power, signal, fault), and outputs fault signals to the control system at the same time to trigger corresponding safety protection actions, facilitating maintenance personnel to quickly locate problems.
Industrial-grade Stable Protection Performance: Encapsulated in an all-metal housing with a protection rating of IP20, it has excellent anti-electromagnetic interference capability (EMC compliant with EN 55011 standard), and can resist the impact of harsh working conditions in industrial sites such as voltage fluctuations and electromagnetic radiation. Its operating temperature range covers -25℃~+60℃, with a robust and durable structure and a long service life.
- Convenient Installation and Flexible Adaptation: Supports TS35 DIN rail mounting, with a plug-in terminal block design for quick installation, disassembly and maintenance. It requires no complex parameter configuration and supports plug-and-play, being compatible with ABB and third-party safety control systems and DCS systems. It is highly adaptable to various industrial safety loop scenarios.
III. Technical Parameters
| Parameter Name | Specification |
|---|---|
| Product Model | ABB SB822 3BSE018172R1 |
| Product Type | Industrial-grade Safety Bridge Module (Signal Isolation and Bidirectional Transmission Unit) |
| Signal Type | Analog: 4-20mA DC; Switch: Dry contact (NO/NC), supporting bidirectional transmission |
| Isolation Performance | Signal isolation degree of 2.5kVrms/1min, dual electrical isolation between power supply and signal |
| Power Supply Parameters | 24V DC±10%, power consumption ≤3W, supporting redundant power input to improve power supply reliability |
| Environmental Adaptability | Operating temperature -25℃~+60℃, storage temperature -40℃~+85℃; Relative humidity 5%~95% (non-condensing) |
| Protection Performance | IP20 protection rating, all-metal housing, anti-electromagnetic interference (EMC compliant with EN 55011 standard) |
| Installation Method | TS35 DIN rail mounting, plug-in terminal blocks |
| Dimensions | 22.5mm (W) × 120mm (H) × 100mm (D) |
IV. Working Principle
ABB SB822 3BSE018172R1 safety bridge module realizes reliable signal interaction between the safety loop and the control loop based on the closed-loop working process of signal access and isolation - conversion and processing - bidirectional transmission - fault monitoring and feedback. The specific working process is divided into four core stages:
Analog/switch signals from the safe or non-safe side are connected to the module through dedicated plug-in terminals. The internal electrical isolation circuit physically isolates the circuits on both sides, effectively blocking electrical interference and fault conduction, and filtering out signal clutter at the same time to ensure the stability and purity of the accessed signals, providing a reliable basis for subsequent processing.
For different types of input signals, the module's built-in conversion circuit performs adaptive processing: analog signals undergo linear conversion to ensure no loss of transmission accuracy; switch signals achieve reliable triggering through level conversion and are processed with anti-shake function to avoid false triggering. After processing, standard signals suitable for the circuit on the other side are generated to ensure the accuracy of signal interaction.
The processed standard signals are transmitted to the corresponding side circuit (safe side → non-safe side or vice versa) through the output terminals, realizing seamless bidirectional signal interaction. For example, it transmits sensor signals from the safe side to the non-safe side PLC, and at the same time transmits the PLC's reset signal back to the safe side circuit. The transmission process is free of delay and distortion, ensuring the synchronous response of control commands and feedback signals.
