Description

ABB AO845 3BSE045584R1 Analog Output Module

The ABB AO845 3BSE045584R1 serves as the primary AO845 Analog Output Module utilized to execute 4-20 mA signal output control across ABB S800 I/O system platforms. The module provides 8 unipolar analog output channels with HART communication support and supports single or redundant configuration through ModuleBus.

Hardware Specifications

Parameter	Specification
Model	AO845 3BSE045584R1
Brand	ABB
Origin	Sweden
Weight	0.21 kg
Dimensions	45 mm W x 102 mm D x 119 mm H
Operating Temp	0 to +55 deg C
Power Consumption	Typ. 3.5 W
Product Type	Analog Output Module
Series	ABB S800 I/O
Signal Specification	4-20 mA
Number of Channels	8 unipolar analog output channels
HART Support	Yes
Redundancy Support	Yes
Resolution	12 bit
Isolation	Groupwise isolated from ground
Output Load	Maximum 750 ohm
Output Error	Maximum 0.1%
Temperature Drift	Maximum 50 ppm/deg C
Update Cycle Time	10 ms
Current Limiting	Short circuit proof current limited output
Maximum Field Cable Length	600 m
Rated Insulation Voltage	50 V
Dielectric Test Voltage	500 V AC
Current Consumption +5 V ModuleBus	Maximum 125 mA
Current Consumption +24 V External	218 mA
MTU Compatibility	TU810, TU812, TU814, TU830, TU833, TU842, TU843, TU852
Keying Code	DB
Protection Class	IP20 according to IEC 60529
EMC Standard	EN 61000-6-4 and EN 61000-6-2
Safety Standard	EN 61010-1, UL 61010-1, EN 61010-2-201, UL 61010-2-201

ABB S800 I/O Backplane Communication and I/O Density Scaling

The AO845 module operates within the ABB S800 I/O architecture and exchanges process data through the ModuleBus interface. The hardware supports I/O density scaling by providing eight analog output channels in a compact S800 module format. Additionally, redundant operation allows two modules to participate in a coordinated configuration where the ModuleBus master manages module status supervision.

The module performs cyclic self-diagnostics during operation. External channel errors are generated when process power supply conditions are insufficient or when the measured output current does not match the configured value above the 1 mA threshold. Internal channel errors are reported when the output circuit cannot maintain the requested current value.

Module-level diagnostics monitor output transistor faults, short circuits, checksum failures, internal power supply conditions, status link errors, watchdog operation, and incorrect OSP behavior. Therefore, the system can identify hardware execution faults through the module diagnostic interface.

Frequently Asked Questions

Q: Does the AO845 3BSE045584R1 support redundant operation?
A: Yes. The AO845 supports redundant applications. In redundant configurations, the ModuleBus master supervises module status and commands the module to an error state when internal faults occur.

Q: What type of field signals can the AO845 output?
A: The module provides eight unipolar analog output channels with 4-20 mA signal capability and HART communication support.

Q: How does the module handle output short circuits?
A: The AO845 uses current-limited output circuitry with short circuit protection. Diagnostic functions report output transistor errors and channel faults.

Field Installation Guidelines

Install the AO845 module on compatible ABB S800 I/O MTUs according to the selected hardware configuration. Verify the MTU keying code before mounting the module to prevent incorrect module placement.

Connect field wiring according to the approved terminal assignment. Maintain proper cable routing between analog signal wiring and high-energy conductors to reduce electromagnetic interference. Use appropriate shield grounding practices according to the installation standard of the control system.

Before commissioning, verify the external process power supply, channel configuration, ModuleBus communication status, and diagnostic LED indications. Confirm that the connected field devices match the configured 4-20 mA output range.

Specifications

• Brand: ABB

Advantages

• High reliability in industrial environments
• Supports continuous operation
• Compatible with major PLC/DCS systems