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Product Overview
The ABB AO845 (part number 3BSE023676R1) is an 8-channel analog output module designed for use within ABB’s S800 I/O modular automation systems. This module provides precise voltage or current analog outputs to control actuators, valves, drives, or other field devices requiring analog input signals. Supporting both 0-20 mA and 4-20 mA current outputs, the AO845 is ideal for demanding process control environments where accuracy and reliability are critical.
Featuring high-resolution digital-to-analog converters and comprehensive diagnostics, the AO845 ensures stable and accurate output signals. It integrates seamlessly into ABB’s scalable automation platforms, supporting distributed architectures and providing flexibility for industrial control applications.
Key Features
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8 individually configurable analog output channels
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Supports current outputs: 0–20 mA, 4–20 mA
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High resolution 16-bit DAC for precise control
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Short-circuit and overload diagnostics
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Galvanic isolation between channels and system bus
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Wide temperature operating range and robust design
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Seamless integration with ABB S800 I/O system
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LED indicators for channel status and diagnostics
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Compatible with ABB 800xA and AC 800M control systems
Technical Specifications
| Parameter | Specification |
|---|---|
| Number of Channels | 8 |
| Output Signal Type | Current (0–20 mA / 4–20 mA) |
| Output Resolution | 16-bit DAC |
| Output Range | 0 to 20 mA or 4 to 20 mA selectable per channel |
| Output Compliance Voltage | 11.4 V maximum |
| Load Resistance | 0–600 Ω |
| Response Time | ≤ 1 ms |
| Accuracy | ±0.1% FSO (Full Scale Output) |
| Isolation | Channel-to-bus galvanic isolation |
| Diagnostics | Short-circuit, overload, open-circuit detection |
| Operating Voltage | Powered from S800 I/O rack |
| Operating Temperature | -25°C to +60°C |
| Storage Temperature | -40°C to +85°C |
| Relative Humidity | 5% to 95% non-condensing |
| Dimensions | 45 × 102 × 119 mm |
| Weight | 0.21kg |
| Mounting | DIN rail or rack-mounted within S800 I/O chassis |
| Certifications | CE, UL, cUL, CSA, RoHS |
Product Advantages
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High Channel Density: 8 analog outputs in a compact form factor maximize panel space.
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Precision and Stability: 16-bit DAC ensures accurate analog control signals.
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Robust Diagnostics: Early fault detection reduces downtime and maintenance costs.
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Flexible Output Configuration: Each channel can be independently set to 0-20 mA or 4-20 mA mode.
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Galvanic Isolation: Prevents noise and signal interference between channels and system bus.
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Wide Temperature Range: Reliable operation in harsh industrial environments.
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Seamless Integration: Fully compatible with ABB S800 I/O modular automation systems.
Industry Applications
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Process control in chemical and petrochemical plants
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Automation of valve actuators in water/wastewater treatment
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Power generation control systems
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Food and beverage process automation
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HVAC system analog control
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Mining and mineral processing
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Oil & gas pipeline and refinery control
Frequently Asked Questions (FAQ)
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Q: What types of analog outputs does the AO845 support?
A: It supports current outputs configurable as 0–20 mA or 4–20 mA. -
Q: How many analog output channels are available?
A: The module provides 8 independent analog output channels. -
Q: What is the accuracy of the analog output?
A: The module offers ±0.1% full-scale output accuracy. -
Q: Can the AO845 detect output faults?
A: Yes, it provides diagnostics for short circuits, overloads, and open circuits. -
Q: What is the operating temperature range?
A: The module operates reliably between -25°C and +60°C. -
Q: Is the module compatible with ABB 800xA systems?
A: Yes, it is fully compatible with ABB’s 800xA and AC 800M platforms. -
Q: How is the module powered?
A: It is powered through the S800 I/O rack it is installed in. -
Q: What is the physical size of the module?
A: The module dimensions are 45 × 102 × 119 mm. -
Q: What kind of mounting does the AO845 use?
A: It is DIN rail or rack-mounted inside an ABB S800 I/O chassis. -
Q: Does the AO845 support galvanic isolation?
A: Yes, channels are galvanically isolated from the system bus and each other.
Related or Compatible Models (Same Series)
| Model | Description |
|---|---|
| AI845 | 8-channel analog input module for ABB S800 I/O systems |
| AO844 | 4-channel analog output module with voltage output option |
| DI845 | 16-channel digital input module for S800 I/O |
| DO845 | 16-channel digital output module |
| AI842 | 2-channel high-precision analog input module |
| PM565 | AC 800M CPU module with integrated I/O control |
Popular ABB Models (Same Brand)
| Model | Description |
|---|---|
| AI810 | 8-channel analog input module for voltage and current signals |
| DI825 | 16-channel digital input module |
| DO830 | 8-channel relay digital output module |
| PM867 | Redundant communication module for AC 800M controller |
| CI854 | Profibus-DP interface module for AC 800M |
| AI835A | Analog input module for S800 I/O, 8 channels, 4–20 mA |
