ABB 3BSE023676R1 AO845 Analog Output Module

The ABB 3BSE023676R1 AO845 analog output module is a high-performance redundant analog output module in the ABB 800xA system. It is specially designed for industrial automation control and features 8 single-polarity analog output channels. It supports output ranges of 0-20 mA and 4-20 mA, and is suitable for single-channel or redundant application scenarios.
Core functions and features
Simulation output capability
Number of channels: 8 single-polarity analog output channels, supporting redundant configuration to ensure high system availability.
Output range: 0-20 mA and 4-20 mA, compatible with standard industrial signals.
Resolution and accuracy: 16-bit resolution, accuracy up to ±0.1% of full scale, meeting high-precision control requirements.
Response time: <5 ms, fast response to dynamic process changes.
Redundancy and reliability
Supports redundant applications, seamless switching between primary and backup modules to avoid system downtime due to single-point failures.
Modules have built-in self-diagnosis functions, which can cyclically detect output status and provide early warnings for potential faults.
Electrical characteristics
Power requirements: 24 VDC power supply, typical power consumption not specified but compliant with industrial standards.
Load capacity: Maximum load resistance 750 Ω, suitable for various on-site equipment.
Isolation design: Channel-to-channel isolation voltage 50 V, enhancing anti-interference capability.
Diagnosis and maintenance
Provides module-level diagnostic information and supports real-time monitoring of output status through ABB 800xA system or dedicated tools (such as Module Termination Unit TU810).
Diagnostic functions can detect faults such as open circuits and short circuits, simplifying maintenance procedures.

Summary of Technical Parameters
Parameter Specification
Model AO845
Order Number 3BSE023676R1
Number of Channels 8 single-polarity analog outputs
Output Range 0-20 mA / 4-20 mA
Resolution 16 bits
Accuracy ±0.1% of full scale
Response Time <5 ms
Power Supply 24 VDC
Maximum Load Resistance 750 Ω
Isolation Voltage 50 V (between channels)
Diagnostic Function Self-diagnosis, open circuit/closed circuit detection
Redundancy Support Yes
Applicable Systems ABB 800xA, AC800M

Application scenario
Process Control
In industries such as chemical engineering, power generation, and metallurgy, it is used to control actuators like valves and frequency converters to achieve precise regulation of process parameters (such as flow, pressure, and temperature).
Redundant design ensures that critical control loops can still operate normally when module failures occur, enhancing system safety.
Redundant System Integration
Combined with ABB AC800M controllers, CI857 communication modules, etc., it builds a highly available DCS system, suitable for scenarios with extremely high reliability requirements (such as nuclear power plants, natural gas processing plants).
Multi-brand Equipment Compatibility
Through standard current signal output, it can be seamlessly integrated with third-party equipment (such as instruments or actuators from brands like Siemens, Schneider, etc.), reducing system renovation costs.