ABB AO820 3BSE008546R1 AO820 Analog Output

The ABB AO820 functions as a versatile bipolar output interface within the S800 I/O system. This module converts digital control logic into precise analog signals for field devices. It features four isolated channels that support both current and voltage modes. Operators can configure each channel independently via software settings. This flexibility allows the module to drive various actuators and valves simultaneously.

Technical Performance and Signal Ranges

The AO820 delivers high-speed response times with a rise time below 0.7 ms. It utilizes a 12-bit resolution to maintain accuracy across several signal ranges. For current applications, it supports -20 to +20 mA, 0 to 20 mA, and 4 to 20 mA. In voltage mode, it provides -10 to +10 V, 0 to 10 V, and 2 to 10 V outputs. The hardware includes separate terminal sets for each signal type to prevent wiring errors.

Advanced Diagnostics and System Safety

Safety remains a priority through integrated galvanic isolation and continuous supervision. The module constantly monitors the process voltage and checks for open-circuit conditions. If a fault occurs, the unit immediately reports the error through the ModuleBus interface. Furthermore, the design handles under-range and over-range values up to 15%. This robust diagnostic suite ensures stable operation in critical industrial processes.

Installation and Environmental Resistance

This Sweden-manufactured module features a compact footprint for dense cabinet installations. It operates efficiently with a typical power dissipation of only 6 W. The low temperature drift of 90 ppm/°C guarantees signal stability in fluctuating environments. Because the AO820 remains an active product, it offers long-term availability for modern DCS architectures. It serves as a reliable solution for power plants and chemical processing facilities.

Technical Specifications Table