Application Scenarios
In a pulp and paper mill, the Valmet DNA system monitors hundreds of discrete signals across the production line—limit switches on pulp refiners, safety interlocks on paper machine hoods, and pump status contacts throughout the stock preparation area. When one of these input signals fails to register, operators lose visibility of critical equipment states, potentially allowing unsafe conditions to develop.
The A413285 BIR82 addresses this challenge through its 16-channel digital input architecture with open-wire detection for normally closed sensors . If a field wiring connection degrades or a sensor contact fails, the module detects the fault and reports it to the control system, enabling maintenance intervention before the signal loss affects process safety. Its software-selectable debounce filters (0.5, 1, or 3 ms) eliminate nuisance signals from mechanical contact bounce, ensuring that only genuine state changes are registered .
Parameters
| Main Parameters | Value/Description |
|---|---|
| Product Model | A413285 BIR82 |
| Manufacturer | Neles Automation / Valmet |
| Product Category | Digital Input Module (Binary Input Unit) |
| Input Channels | 16 digital inputs |
| Input Signal Type | 24V DC discrete signals |
| Input Current | 5 mA typical |
| Logic High Threshold | 11V |
| Logic Low Threshold | 5V |
| Debounce Filter | Software-selectable: 0.5, 1, or 3 ms |
| Isolation | Opto-isolated, channel-to-channel |
| Open-Wire Detection | Yes, for normally closed sensors |
| Mounting | Companion board mounting on A413278 base card |
| Operating Temperature | 0°C to +55°C |
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16 Input Channels: High-density digital input capacity within a single companion board footprint.
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Opto-Isolated Inputs: Protects the control system from ground loops and electrical transients in field wiring.
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Open-Wire Detection: Identifies broken sensor connections for normally closed circuits, enabling proactive maintenance.
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Selectable Debounce: Eliminates false triggering from mechanical switch bounce without external filter components.
