ABB AO801 8-Channel Analog Output Module for S800L

June 15, 2026 • 3 min read • wayne • Guide

The AO801 analog output module delivers eight precise unipolar channels for 0-20 mA or 4-20 mA signals. This module integrates seamlessly into the ABB S800L I/O system. It offers a robust solution for demanding process control applications. Engineers rely on its high accuracy and fast update cycle time. The AO801 provides reliable signal conversion for critical industrial loops.

Expert Technical Evaluation & Performance Review

This module achieves a typical error rate of only 0.1 percent. Its 12-bit resolution ensures fine granularity for analog control signals. The update cycle time is a swift 1 millisecond. This speed supports rapid actuator response in dynamic processes. The rise time measures just 10 microseconds for quick signal changes.

The module handles a maximum output load of 850 Ohms. This capability allows it to drive long cable runs effectively. The maximum field cable length extends to 600 meters. This reach provides flexibility for large-scale plant layouts. The under and over range extends to plus or minus 15 percent.

Temperature drift remains minimal at a typical 30 ppm per degree Celsius. This stability maintains signal integrity across varying thermal conditions. The module features groupwise isolation from ground for enhanced protection. This isolation helps prevent ground loop interference in complex systems. The rated insulation voltage stands at 50 Volts for safe operation.

Short circuit proof outputs provide critical protection against wiring faults. The module limits current automatically upon detecting a short circuit. This feature safeguards both the module and connected field devices. The power dissipation is a low 3.8 Watts, reducing heat buildup. The +24 V external current consumption is 200 mA.

Step-by-Step Installation & Wiring Guide

Mount the module securely on a standard DIN rail within the S800L system. Use the detachable connectors for both process and power wiring. This design simplifies installation and future maintenance tasks. Ensure the module achieves a proper earth ground connection. The equipment class is Class I according to IEC 61140.

Select wire sizes from the supported range. Use solid wire from 0.05 to 2.5 mm². Use stranded wire from 0.05 to 1.5 mm². Strip the wire insulation to a length between 6 and 7.5 mm. Apply a recommended torque of 0.5 to 0.6 Nm to the connector screws.

Connect the analog output channels to your field actuators. The module supports unipolar single-ended signals. Ensure the output load does not exceed the maximum 850 Ohms. The module performs a cyclic self-diagnostic to verify its health. A low internal power supply will set the module to the INIT state. In this state, the module outputs no signal to the field.

Use the Output Signal Processing (OSP) feature for error handling. The OSP sets outputs to a predetermined state upon error detection. This action prevents uncontrolled actuator movement during faults. Observe the front panel LEDs for status indication. The S(tatus) LED shows either run or fault conditions. Additional LEDs indicate Module Error, Module Warning, and Channel Error.