Product Details
Description
The AO845 is a high-reliability current output module that delivers 4–20 mA signals to control valves, positioners, and actuators. It supports bi-directional HART communication for device diagnostics and, with a redundant MTU, ensures fault-tolerant operation. Widely used in oil and gas, petrochemical, and power industries, it provides safe and stable process control.
Specifications
-
Manufacturer: ABB
-
Country of Origin: Sweden
-
Model Number: AO845 (3BSE023676R1)
-
Output Channels: 8 channels
-
Signal Range: 4 to 20 mA
-
D/A Resolution: 12 bits
-
HART Support: Bi-directional HART protocol pass-through
-
Redundancy: Supports 1:1 redundancy for high availability
-
Power Supply: 24 VDC nominal
-
Physical Weight: 0.25 kg (0.55 lbs)
-
Maximum Load: 750 ohms at 20 mA
Features
-
High-Availability Redundancy: Designed for paired operation to provide seamless failover, ensuring the process remains controlled during a module swap or internal fault.
-
HART Protocol Capability: Facilitates digital data exchange with smart instruments, allowing for remote asset management and secondary variable monitoring.
-
Intelligent Fail-Safe Logic: Features user-configurable safety states to hold the last valid signal or move to a pre-defined safe value during communication loss.
-
Comprehensive Self-Diagnostics: Continuously monitors the health of internal digital-to-analog converters and output loop integrity.
-
Active Current Supervision: Automatically detects open circuits and field wiring faults, reporting errors immediately to the central controller.
-
Hot-Swap Support: Allows for live replacement of a faulty module without requiring a system shutdown, significantly reducing maintenance downtime.
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
Tech & Buying Guide
Ensuring Operational Continuity: The Strategic Value of Redundant Automation Systems
In modern industrial landscapes, unplanned downtime is the ultimate adversary. For sectors relying on complex PLC and DCS architectures, a single hardware failure can trigger catastrophic production losses. Therefore, implementing redundant automation systems is no longer a luxury; it is a fundamental requirement for mission-critical operations. In this article, I analyze why redundancy remains the backbone of reliable industrial infrastructure.
Selecting the Right Cables for Industrial Automation: A Comprehensive Guide
Selecting the appropriate cabling infrastructure is critical for the success of any industrial automation project. Improper cable selection often leads to signal degradation, system instability, and costly downtime. As an automation engineer, I frequently see projects compromised by poor cabling choices in harsh industrial environments. This guide simplifies the complex landscape of cabling to help you make informed decisions for your PLC, DCS, and control systems.
Preventing Spurious Trips in Emergency Stop Systems: A Technical Guide
In industrial automation, the Emergency Stop (E-Stop) pushbutton is the ultimate safety line. However, relying on a single Normally-Closed (NC) contact can sometimes lead to unexpected spurious trips. As a control systems engineer, I have seen these nuisance trips halt entire production lines, causing significant downtime. Understanding why these components fail and how to implement robust architecture is essential for any reliable DCS or PLC-based safety system.