Overview
Specification
| Parameter | Specification | Notes |
|---|---|---|
| Manufacturer | ABB | — |
| Model | AO845 | — |
| Part Number | 3BSE023676R1 | — |
| Module Type | 8‑Channel Analog Output Module | Redundant operation supported |
| Compatible Systems | ABB S800 I/O, System 800xA, AC800M | — |
| Output Channels | 8 | Unipolar analog outputs |
| Output Signal Type | Current: 4–20 mA | HART-enabled pass-through supported |
| Channel Configuration | Single or redundant | Automatic failover in redundant mode |
| Resolution | 12-bit | 4096 discrete steps per channel |
| Accuracy | ≤ ±0.1% of span | Includes linearity, gain, offset errors |
| Update Cycle Time | 10 ms per channel | Typical |
| Output Load Resistance | Max 750 Ω | Compatible with standard industrial loops |
| Output Rise Time (Filter Off) | ≤ 23 ms (0–90%) | Step response |
| Output Rise Time (Filter On) | ≤ 12.5 ms (for 4 mA step) | Optional digital filter active |
| Under/Over Range | −12.5% / +15% of span | Safety margin for signal control |
| Maximum Field Cable Length | 600 m | Signal integrity maintained up to 600 m |
| Isolation | Group-wise isolated from ground | Protects channels from mutual interference |
| Rated Insulation Voltage | 50 V | Channel-to-channel and channel-to-earth |
| Dielectric Test Voltage | 500 V AC | Between channels and ground |
| Temperature Drift | ≤ 50 ppm/°C | Ensures stability across industrial temperature ranges |
| Power Supply | +24 V DC | External supply |
| Current Consumption (+24 V) | Approx. 218 mA | Module only |
| Current Consumption (Modulebus +5 V) | Approx. 125 mA | For internal bus operation |
| Power Dissipation | 3.5 W typical | Efficient low heat generation |
| Operating Temperature | 0 °C to +55 °C | Standard industrial environment |
| Storage Temperature | −40 °C to +70 °C | Safe for storage and transport |
| Relative Humidity | 5–95% non-condensing | Suitable for typical industrial environments |
| EMC Compliance | EN61000-6-4, EN61000-6-2 | Industrial EMC standards |
| Mechanical Dimensions (W×D×H) | ~45 mm × 102 mm × 119 mm | Standard ABB rack size |
| Weight | ~0.21 kg | Lightweight for easy installation |
| Diagnostics | LEDs, status bits | Module, channel, warning, OSP status |
| Safety Features | OSP (Output Safe Position), short-circuit protection | Ensures safe operation during faults |
| HART Support | Yes, one pass-through per 8 channels | Remote configuration and diagnostics |
FAQ
Q1: Is the AO845 compatible with all ABB control systems?
A1: The module is compatible with Advant OCS and 800xA systems. Ensure your system firmware supports HART functionality.
Q2: Can this module operate in redundant mode?
A2: Yes, AO845 supports dual-redundant operation for uninterrupted process control.
Q3: How many channels does the module support?
A3: The AO845 provides eight configurable analog output channels.
Q4: Does it support HART diagnostics?
A4: Yes, HART protocol enables remote monitoring and device configuration.
Q5: What is the operating temperature range?
A5: It operates reliably between 0°C and 55°C in standard industrial environments.
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