ABB AO845 Analog Output Module Redundant DCS Module
| Cycle Time | 10 ms per channel, enabling real-time response in dynamic systems . |
| Redundancy Support | – AO845A: Supports redundant configurations for high-availability systems, with automatic failover to backup modules . – Hot-swappable design for maintenance without downtime . |
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Description
ABB AO845 Analog Output Module Redundant DCS Module
AO845
The ABB AO845 series is a family of high-precision analog output modules designed for industrial automation systems, particularly within ABB’s S800 I/O and AC 800M control ecosystems. These modules convert digital signals into analog outputs (e.g., 4–20 mA, 0–10 V) to control actuators, valves, and other process equipment in critical applications. Below is a detailed breakdown of their technical specifications, applications, and lifecycle considerations.
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| Parameter | AO845/AO845A |
|---|---|
| Channels | 8 unipolar analog output channels, configurable for current or voltage signals . |
| Signal Range | – Current: 4–20 mA (default), ±15% overrange tolerance . – Voltage: 0–10 V (optional) . |
| Resolution | 12-bit (±0.1% accuracy), supporting precise control of process variables . |
| Cycle Time | 10 ms per channel, enabling real-time response in dynamic systems . |
| Redundancy Support | – AO845A: Supports redundant configurations for high-availability systems, with automatic failover to backup modules . – Hot-swappable design for maintenance without downtime . |
| Communication | – HART Pass-Through: Enables bidirectional communication with HART-compatible field devices . – Fieldbus Integration: Works with PROFIBUS-DP, Modbus, and ABB’s Advant Fieldbus 100 . |
| Power Supply | 24V DC ±20%, with short-circuit protection and reverse polarity safeguarding . |
| Environmental Ratings | – Temperature: -25°C to +70°C (operational), -40°C to +85°C (storage) . – Protection: IP20-rated enclosure for dust and drip resistance . |
| Physical Dimensions | 71 x 106 x 22 mm, lightweight (0.1 kg) for compact DIN rail mounting . |
Precision Control
The 12-bit resolution and ±0.1% accuracy ensure reliable output for critical processes like chemical reactor temperature regulation or pharmaceutical batch mixing .
The 12-bit resolution and ±0.1% accuracy ensure reliable output for critical processes like chemical reactor temperature regulation or pharmaceutical batch mixing .
Redundancy & Reliability
The AO845A variant supports redundant ModuleBus configurations, ensuring continuous operation in power plants or oil refineries where downtime is costly . Built-in self-diagnostics (e.g., open circuit detection, transistor failure) flag issues via LED indicators and remote software alerts .
The AO845A variant supports redundant ModuleBus configurations, ensuring continuous operation in power plants or oil refineries where downtime is costly . Built-in self-diagnostics (e.g., open circuit detection, transistor failure) flag issues via LED indicators and remote software alerts .
Flexible Integration
Compatible with ABB’s AC 800M controllers (e.g., PM861A) and S800 I/O modules (e.g., AI845 for analog input), the AO845 enables scalable automation systems . It also integrates with non-ABB controllers via industrial protocols like Profibus DP .
Compatible with ABB’s AC 800M controllers (e.g., PM861A) and S800 I/O modules (e.g., AI845 for analog input), the AO845 enables scalable automation systems . It also integrates with non-ABB controllers via industrial protocols like Profibus DP .
HART Protocol Support
The HART pass-through feature allows direct communication with smart transmitters, enabling remote calibration and diagnostics without disrupting process control .
The HART pass-through feature allows direct communication with smart transmitters, enabling remote calibration and diagnostics without disrupting process control .
For more information, please click on the following link:
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