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ABB AO845 3BSE023676R1 Analog Output Module

Configured for 4-20 mA analog signal generation, the ABB AO845 3BSE023676R1 (AO845 Analog Output Module) provides eight output channels for process control signal transmission. The module uses 12-bit resolution and groupwise isolation from ground. It supports redundant configuration and accepts field loads up to 750 ohm. The specified module insulation voltage is 50 V.

Hardware Specifications

Parameter	Specification
Model	AO845 3BSE023676R1
Spare Model	3BSE023676R1
Brand	ABB
Product Type	Analog Output Module
Origin	Sweden
Weight	0.2 kg
Dimensions	4.5 x 10.5 x 11.8 cm estimated shipping size
Operating Temp	Not specified in supplied data
Power Consumption	Typ. 3.5 W
Signal Type	Analog Output
Output Signal	4-20 mA
Number of Channels	8
Resolution	12 bit
Isolation	Groupwise isolated from ground
Redundancy	Supported
Maximum Load	750 ohm
Under Range	-12.5%
Over Range	+15%
Rated Insulation Voltage	50 V
Dielectric Test Voltage	500 V AC
Current Consumption, +5 V Modulebus	Max. 125 mA
Current Consumption, +24 V External	218 mA
Tariff Code	8537101190
Manufacturer	ABB
Shipment Origin	Xiamen, China

ABB Industrial Control and I/O Characteristics

The AO845 operates as an analog output interface within ABB distributed I/O architectures. Each of its eight channels generates a 4-20 mA signal with 12-bit resolution, allowing the control system to represent process values through standardized current transmission.

Furthermore, the module provides groupwise isolation from ground and specifies 50 V rated insulation voltage. The 500 V AC dielectric test rating defines the stated insulation test capability.

The module supports redundant operation, while the specified 750 ohm load capability permits connection to field devices that remain within the output circuit load limit. Therefore, installation should account for the complete loop resistance, including field wiring and connected equipment.

Frequently Asked Questions

Q: How many analog output channels does the AO845 provide?
A: The AO845 provides 8 analog output channels, with each channel supporting a 4-20 mA signal.

Q: What output resolution does the AO845 provide?
A: The module provides 12-bit output resolution for its analog channels.

Q: What are the specified power consumption and current requirements?
A: Typical power dissipation is 3.5 W. Modulebus current consumption is a maximum of 125 mA at +5 V, while external +24 V current consumption is 218 mA.

Field Installation Guidelines

• Verify the module identity and terminal assignment before connecting field wiring.
• Confirm that the connected field device and complete current loop remain within the specified 750 ohm load limit.
• Route analog signal wiring separately from high-voltage switching and high-current power conductors where practical.
• Follow the applicable ABB installation documentation for grounding, shielding, and cabinet bonding.
• Check polarity before energizing each 4-20 mA output circuit.
• Verify the control-system configuration against the physical channel assignment before commissioning.
• For redundant configurations, confirm the installed hardware arrangement and system configuration before applying process signals.
• Inspect wiring termination and insulation before performing loop checks.
• Do not exceed the specified 50 V rated insulation voltage or the stated electrical limits.

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