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Description
ABB AO820 3BSE008546R1 Analog Output Module
The ABB AO820 3BSE008546R1, also cataloged as the AO820 Analog Output Module, provides four configurable bipolar analog output channels for current or voltage signal generation in ABB S800 I/O systems. Each channel uses software configuration to select the required output mode, while separate terminal connections support current and voltage wiring.
Hardware Specifications
Parameter
Specification
Model
AO820 3BSE008546R1
Spare Model
3BSE008546R1
Brand
ABB
Product Type
Analog Output Module
Origin
Sweden
Weight
0.24 kg
Dimensions
4.5 x 11 x 12 cm estimated shipping size
Number of Channels
4 bipolar analog output channels
Output Type
Configurable current or voltage output
Resolution
12 bits including sign
Under/Over Range
+/-15%
Output Load
<= 550 ohm for current output; >= 5 kohm for voltage output
Temperature Drift
Max 90 ppm/deg C
Rise Time
< 0.7 ms
Update Cycle Time
<= 1.5 ms
Rated Insulation Voltage
50 V
Diagnostics
Output readback, A/D converter communication supervision, open-circuit diagnostics, process voltage supervision
ModuleBus Diagnostics
Channel error signals available through ModuleBus
ABB S800 I/O Signal Handling
The AO820 uses four independent bipolar analog output channels. Each channel can operate in current or voltage mode through software configuration. Therefore, the physical wiring must match the selected signal mode because the module provides separate terminal sets for voltage and current outputs.
The module also verifies output data through readback from the A/D converters. In addition, it continuously monitors open-circuit conditions. Process voltage supervision detects loss of the required process voltage and reports the resulting channel error through ModuleBus.
For ABB S800 I/O installations, the module interfaces with the system backplane and ModuleBus architecture. Consequently, engineering configuration should match the installed I/O station, terminal unit, and configured channel signal type.
Frequently Asked Questions
Q: How many analog output channels does the AO820 provide? A: The AO820 provides 4 bipolar analog output channels. Each channel can be configured for either current or voltage output.
Q: Can the same channel be wired for both current and voltage output simultaneously? A: No. The required output mode is selected through software, and the corresponding terminal set must be wired correctly for that mode.
Q: How does the module detect output-related faults? A: The module reads back output data to verify A/D converter communication and continuously performs open-circuit diagnostics. Process voltage supervision also generates channel error information when the monitored voltage disappears.
Field Installation Guidelines
Confirm the AO820 module identity and terminal arrangement before installation.
Verify the configured current or voltage mode for every channel before connecting field wiring.
Use the designated terminal connections for the selected signal type; do not interchange current and voltage terminals.
Route analog signal wiring separately from high-voltage power and high-current switching conductors to reduce electrical interference.
Apply appropriate cable shielding and terminate the shield according to the site's established grounding practice.
Verify field-loop polarity and load impedance before energizing the output channels.
Confirm that current-output loads remain within the specified load capability and that voltage-output loads meet the stated minimum impedance.
After installation, verify channel output values and review ModuleBus diagnostic status for communication, open-circuit, and process-voltage errors.
Do not introduce undocumented operating-temperature or power-consumption limits during installation; use the applicable ABB system documentation for those values.
