The ABB AO845 (3BSE023676R1) is an 8-channel analog output module from the S800 I/O system, designed for ABB System 800xA DCS and AC 800M controllers. It provides 4...20 mA current signals to control field actuators such as valves, positioners, and variable speed drives.
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AO845 3BSE023676R1Order(MOQ) :
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3kg| Specification | Description |
|---|---|
| Manufacturer | ABB |
| Model | AO845 |
| Order Code | 3BSE023676R1 |
| Product Family | S800 I/O System |
| Platform Compatibility | System 800xA DCS, AC 800M controllers |
| Product Type | Analog Output Module |
| Channels | 8 x unipolar, 4...20 mA (±15% overrange) |
| Resolution | 12-bit |
| Accuracy | Max. ±0.1% |
| Output Load | Max. 750 Ω |
| Rise Time (0-90%) | 23 ms (filter disabled); max 4 mA / 12.5 ms (filter enabled) |
| Update Cycle Time | 10 ms |
| Maximum Field Cable Length | 600 m |
| HART Support | Yes – pass-through, point-to-point communication |
| Redundancy Support | Yes – supports 1:1 redundant configuration |
| Isolation | Groupwise isolated from ground (rated insulation voltage 50V, dielectric test 500V AC) |
| Power Dissipation | Typ. 3.5 W |
| Current Consumption (+5V ModuleBus) | Max. 125 mA |
| Current Consumption (+24V external) | Max. 218 mA |
| Diagnostic LEDs | F (Fault), R (Run), W (Warning), OSP |
| Operating Temperature | 0°C to +55°C (vertical mounting in compact MTU: 40°C) |
| Storage Temperature | -40°C to +70°C |
| Protection Class | IP20 |
| Weight | Approx. 0.25 kg |
| Country of Origin | Switzerland |
| Compatible MTUs | TU810, TU812, TU814, TU830, TU833 (single); TU842, TU843, TU852 (redundant) |
| Keying Code | CC |
| Model | Description | Typical Application |
|---|---|---|
| AO845A (3BSE045584R1) | Enhanced version with improved performance, accuracy, and additional diagnostic capabilities | Applications requiring higher precision and faster update rates |
| AO845A-EA | AO845A variant with SIL 2 certification | Safety-related (SIL2) applications |
| AO815 (3BSE052605R1) | 8-channel analog output with HART (non-redundant) | Applications requiring HART but not redundancy |
| AO810V2 | 8-channel analog output, 0/4...20 mA (non-HART) | Standard non-HART analog output applications |
| AI845 | 8-channel analog input module with HART and redundancy support | Input counterpart for redundant analog I/O control loops |
| TU842 / TU852 | Redundant MTU for AO845 | Required for redundant configuration |
| TU810 / TU814 | Compact MTU for AO845 | Standard single configuration wiring |
| 3BHE046836R0102 | 3BHE013088R001 | 3BHE014135R0011 |
| 3BHE027632R0101 | 3BHE014070R0101 | 3BHE037864R0108 |
| 3BSE082896R1 PM858K02 | 3BHE030579R0003 | 3BHE041626R0101 |
| 3BHE009681R0101 5SHY4045L0001 | 3BHE024747R0101 | 3BHE032025R1101 |
| 3BHE030579R0003 | 3BHE024855R0101 | 3BHE024313R0101 |
| 3BHB003041R0101 | 3BHE032025R1101 | 3BHE008128R0001 |
| 3BHB004661R0101 | 3BHE021887R0101 | 3BSE050091R65 |
Q1: What is the difference between AO845 and AO845A?
The AO845A is the enhanced version of the AO845, offering improved accuracy, faster update rates, and additional diagnostic capabilities . The AO845A variant (specifically AO845A-EA) also supports SIL 2 certification . Both support 8 channels and redundant configurations.
Q2: Which ABB control systems is the AO845 compatible with?
The AO845 is part of the S800 I/O system and is designed for ABB System 800xA DCS and AC 800M controllers .
Q3: Does the AO845 support HART communication?
Yes. Each of the 8 output channels features HART pass-through functionality, enabling two-way digital communication for remote configuration, calibration, and asset management of smart field instruments. The output filter must be enabled on channels used for HART communication .
Q4: How does redundancy work with the AO845?
Two AO845 modules can be configured as a 1:1 redundant pair using a redundant MTU (TU842 or TU852). If the primary module fails (e.g., output circuit error, power supply issue), the system automatically switches to the standby module without interrupting the control signal .
Q5: What are the diagnostic capabilities of the AO845?
The module performs cyclic self-diagnostics, reporting:
External Channel Error – process power supply too low or open circuit
Internal Channel Error – output circuit cannot deliver correct current
Module Error – output transistor error, short circuit, checksum error, internal power supply error, or watchdog error
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The ABB AO820 (3BSE008546R1) is a 4-channel bipolar analog output module from the S800 I/O system, designed for ABB System 800xA DCS and AC 800M controllers.The module features individual galvanic isolation per channel and built-in diagnostics, making it a reliable solution for precision control in demanding industrial environments including chemical, oil & gas, and pharmaceutical applications.
The ABB AO890 (3BSC690072R1) is an 8-channel intrinsically safe analog output module from the S800 I/O system, designed for ABB System 800xA DCS and AC 800M controllers. The module features integrated intrinsic safety (Ex ia) protection components on each channel, allowing direct connection to process equipment in hazardous areas (Zone 0/1/2) without requiring external safety barriers.
The ABB AO845 (3BSE023676R1) is an 8-channel analog output module from the S800 I/O system, designed for ABB System 800xA DCS and AC 800M controllers. It provides 4...20 mA current signals to control field actuators such as valves, positioners, and variable speed drives.
The ABB AO845A (3BSE045584R1) is an 8-channel analog output module from the S800 I/O system, designed for ABB System 800xA DCS and AC 800M controllers. It provides 4...20 mA current signals to control field actuators such as valves, positioners, and variable speed drives, while integrated HART pass-through enables two-way digital communication with smart field instruments.
The ABB AO815 (3BSE052605R1) is an 8-channel analog output module from the S800 I/O system, designed for ABB System 800xA DCS and AC 800M controllers. It provides 4...20 mA current signals to control field actuators such as valves, positioners, and variable speed drives, while integrated HART pass-through enables two-way digital communication with smart field instruments.
The ABB AO801 (3BSE020514R1) is an 8-channel analog output module from the S800L I/O system, designed for ABB System 800xA DCS and AC 800M controllers. It provides precise 0...20 mA or 4...20 mA current signals to control field actuators such as regulating valves, positioners, and variable speed drives in process automation applications.
The ABB AO815-eA (3BSE052605R2) is an 8-channel analog output module from the S800 I/O system, designed for the System 800xA DCS and AC 800M controller platform. Each channel provides 4...20 mA (or configurable 0...20 mA) output with HART pass-through communication, enabling seamless integration with smart field instruments such as positioners, valves, and actuators.
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