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.
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AO845A 3BSE045584R1Order(MOQ) :
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3kg| Specification | Description |
|---|---|
| Manufacturer | ABB |
| Model | AO845A |
| Article Number | 3BSE045584R1 |
| Product Family | S800 I/O System |
| Platform Compatibility | System 800xA DCS, AC 800M controllers, Freelance |
| Product Type | Analog Output Module with HART |
| Channels | 8 x unipolar, 4...20 mA (configurable 0...20 mA) |
| Resolution | 12-bit |
| Accuracy | Max. ±0.1% of full scale |
| Temperature Drift | Max. 50 ppm/°C |
| 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 |
| Output Protection | Short-circuit proof to ZP or +24 V; current limited output |
| 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 (Output Set as Predetermined) |
| Operating Temperature | 0°C to +55°C (vertical mounting in compact MTU: 40°C) |
| Storage Temperature | -40°C to +70°C |
| Protection Class | IP20 (IEC 60529) |
| Hazardous Location Certification | C1 Div2 cULus, C1 Zone2 cULus, ATEX Zone 2 |
| Marine Certification | BV, DNV, LR |
| Corrosion Protection | ISA-S71.04: G3 |
| Intrinsic Safety | No |
| High Integrity (SIL) | No (AO845A-EA variant may support SIL 2 per some sources) |
| Compatible MTUs | TU810, TU812, TU814, TU830, TU833, TU842, TU843, TU852 |
| Keying Code | DB |
| Dimensions (W x H x D) | 45 mm x 119 mm x 102 mm |
| Weight | Approx. 0.21 kg |
| Model | Description | Typical Application |
|---|---|---|
| AO845 | Earlier revision without HART support; weaker redundancy capability | Legacy system replacement; upgrading to AO845A recommended for HART functionality |
| AO810V2 | 8-channel analog output, 0/4...20 mA (non-HART) | Standard non-HART analog output applications |
| AO815 | 8-channel analog output with HART (non-redundant) | Applications requiring HART but not redundancy |
| AO820 | 4-channel analog output, ±10 V | Voltage signal applications |
| AO890 | 8-channel analog output with HART and SIL certification | Safety-critical (SIL3) applications |
| AO895 | 8-channel analog output, intrinsically safe with HART | Hazardous area (Zone 0/1/2) installations |
| TU842 / TU852 | Redundant MTU for AO845A | Required for redundant configuration |
| TU810 / TU814 | Compact MTU for AO845A | Standard single configuration wiring |
| AI845A | 8-channel analog input module with HART and redundancy support | Input counterpart for redundant analog I/O control loops |
| 3BHE046836R0102 | 3BHE013088R001 | 3BHE014135R0011 |
| 3BHE027632R0101 | 3BHE014070R0101 | 3BHE037864R0108 |
| 3BSE082896R1 PM858K02 | 3BHE030579R0003 | 3BHE041626R0101 |
| 3BHE009681R0101 5SHY4045L0001 | 3BHE024747R0101 | 3BHE032025R1101 |
| 3BHE030579R0003 | 3BHE024855R0101 | 3BHE024313R0101 |
| 3BHB003041R0101 | 3BHE032025R1101 | 3BHE008128R0001 |
| 3BHB004661R0101 | 3BHE021887R0101 | 3BSE050091R65 |
| 3BHB018162 | 3BHE024577R0101 | 3BHE009319R0001 |
| 3BHB003041R0101 UFC719AE01 | 3BHB003041R0101 | 3BHE020455R0001 |
| 3BSE042238R2 PP846A | 3BHE022293R0101 | 3BHE025088R6618 |
| 3BSE004006R1 CI626V1 | 3PHE022287R0001 | PHARPS3200000 |
| 3BSE018124R1 CI853K01 | PM582-ETH | PHBRC3000000 |
Q1: What is the key difference between AO845A and AO815?
The AO845A supports 1:1 redundancy (hot standby configuration), whereas the AO815 does not. Both support HART pass-through and 8 channels of 4...20 mA output. For high-availability systems where a module failure cannot be tolerated, AO845A with redundant MTU (TU842/TU852) is the recommended choice .
Q2: Which ABB control systems is the AO845A compatible with?
The AO845A is part of the S800 I/O system and is designed for ABB System 800xA DCS, AC 800M controllers, and Freelance systems .
Q3: How does redundancy work with the AO845A?
Two AO845A 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 to the field device .
Q4: Does the AO845A 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 .
Q5: What are the diagnostic capabilities of the AO845A?
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 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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