Description
ABB AO845
Technical Specifications:
- Channels: 8 single-polarity analog output channels
- Signal Type: 4-20 mA DC current output
- Communication: Supports HART protocol passthrough communication
- Isolation: One group of 8 channels is isolated from ground
Functional Features:
- Redundant Application Support: Suitable for both single and redundant system configurations to ensure high availability.
- Continuous Self-Diagnostics: The module cyclically executes self-diagnostics, monitoring for external channel errors, internal channel errors, and module-level faults.
- Extended Diagnostics: Provides advanced diagnostic capabilities for precise fault localization.
- Short-Circuit Protection: Features analog input/output short-circuit protection to ZP or +24 V.
Application Scenarios:
- Critical control loops in the electric power, petrochemical, metallurgy, water treatment, and papermaking industries.
- Direct driving of control valves, frequency converters, and servo motors for precise closed-loop control of temperature, pressure, flow rate, and liquid level.
Performance Parameters:
- Diagnostic Coverage: Real-time monitoring of power supply, output transistor status, checksums, internal power, and watchdog timers.
- Fault Handling: In redundant pairs, the module bus master commands the module into an error state upon internal failure detection.
Material Composition & Structural Features:
- Form Factor: Standard S800 I/O module housing designed for DIN rail mounting.
- Durability: Industrial-grade components ensuring stable operation in harsh environments.
Working Principle:
The module receives digital control signals from the controller via the S800 I/O bus and converts them into high-precision 4-20 mA analog current signals. It simultaneously supports HART communication, allowing smart field devices to transmit secondary variables without interfering with the primary control signal.
Installation Requirements:
- Mount securely on a standard 35mm DIN rail or S800 I/O baseplate.
- Ensure proper alignment with the backplane connector before insertion.
Usage Precautions:
- Verify the configuration for single or redundant application before commissioning.
- Monitor LED indicators for real-time diagnostic feedback and fault clearing.
