Product Description
AO845 / AO845A Analog Output Module Overview
The AO845/AO845A Analog Output Module is designed for both single and redundant applications, offering 8 unipolar analog output channels that support 4…20 mA signals. This module is essential for precise output control and integrates diagnostic capabilities to ensure operational reliability.
Key Features and Benefits
- 8 output channels for 4...20 mA signals
- Suitable for single or redundant applications
- Groupwise isolation from ground for improved protection
- HART pass-through communication for additional control flexibility
- Diagnostics for internal and external errors, including short-circuit detection
- Short-circuit proof current-limited output for safe operation
- Matching MTUs: TU810V1
Diagnostics
- External Channel Error: Triggered if the process power supply voltage is too low or if the output current is less than the set value (open circuit).
- Internal Channel Error: Triggered if the output circuit fails to generate the correct current. In redundant systems, this error commands the module into an error state.
- Module Error: Includes errors like output transistor failure, short circuit, checksum errors, internal power supply issues, and watchdog failures.
Technical Information
| Parameter | Details |
|---|---|
| Signal Specification | 4..20 mA |
| Number of Channels | 8 |
| Resolution | 12-bit |
| Isolation | Groupwise isolated from ground |
| Output Load | Max 750 Ω |
| Error | Max. 0.1% |
| Temperature Drift | Max. 50 ppm/°C |
| Rise Time | Output filter: Disable 23 ms, Enable max 4 mA / 12.5 ms |
| Update Cycle Time | 10 ms |
| Current Consumption | +5V Modulebus: Max. 125 mA |
| Current Consumption | +24V External: 218 mA |
Environmental and Certification Information
| Category | Details |
|---|---|
| Operating Temperature | 0°C to +55°C (32°F to 131°F) |
| Storage Temperature | -40°C to +70°C (-40°F to 158°F) |
| Relative Humidity | 5% to 95%, non-condensing |
| Protection Class | IP20 (IEC 60529) |
| Electrical Safety | EN 61010-1, UL 61010-1, EN 61010-2-201 |
| Marine Certification | BV, DNV, LR |
| EMC Compatibility | EN 61000-6-4, EN 61000-6-2 |
| RoHS Compliance | DIRECTIVE/2011/65/EU (EN 50581:2012) |
Dimensions
- Width: 45 mm (1.77”)
- Depth: 102 mm (4.01”), 111 mm (4.37”) including connector
- Height: 119 mm (4.7”)
- Weight: 0.21 kg (0.46 lbs.)
Compatibility
- Use with MTUs: TU810, TU812, TU814, TU830, TU833, TU842, TU843, TU852
- Keying Code: DB
This module is ideal for applications requiring reliable analog output control in critical environments, offering redundancy, diagnostic capabilities, and robust protection against common electrical faults.
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