Description
1771-DB Allen‑Bradley Programmable controller
Product Dimensions：
Product Description
The Allen-Bradley 1771-DB is a basic DC input module designed for use in PLC-5 systems. It provides 16 points of DC input, allowing the controller to interface with field devices such as switches, pushbuttons, and sensors that output a DC signal. The module is part of the 1771 I/O series and is commonly used in industrial automation systems where reliable and cost-effective digital input is required.
Product Specifications
| Parameter | Value / Description |
|---|---|
| Module Type | DC Input Module |
| Number of Inputs | 16 points (isolated groups) |
| Input Voltage Range | 10–30V DC |
| Input Current per Point | Typically 7–10 mA (at 24V DC) |
| Input Impedance | Approx. 2.7 kΩ |
| On-State Voltage | ≥10V DC |
| Off-State Voltage | ≤5V DC |
| Response Time | ≤10 ms |
| Backplane Current Load | 200 mA max from 5V DC backplane |
| Isolation | 1500V AC between input and backplane |
| Indicator LEDs | One LED per input point |
| Operating Temperature | 0–60 °C (32–140 °F) |
| Relative Humidity | 5–95% (non-condensing) |
| Compatibility | PLC-5 programmable controllers |
| Module Base | 1771 I/O chassis |
Product Advantages
- High Density: 16 input points in a single module save space and reduce system complexity.
- Robust Isolation: 1500V AC isolation ensures protection against voltage spikes and noise.
- Visual Status Indication: Individual LEDs for each input point provide quick diagnostic feedback.
- Wide Voltage Range: Compatible with a broad range of industrial DC sensors and devices.
- Proven Reliability: Part of the trusted Allen-Bradley 1771 series, widely used in legacy and modern systems.
- Ease of Integration: Simple installation and configuration in PLC-5 systems.
Precautions
- Wiring Polarity: Ensure correct polarity when connecting DC inputs to avoid damage.
- Voltage Limits: Do not exceed the 30V DC maximum input voltage.
- Grounding: Proper grounding is essential to avoid noise interference and ensure stable operation.
- Module Insertion: Always power down the chassis before inserting or removing the module.
- Environmental Conditions: Operate within specified temperature and humidity ranges to avoid malfunction.
- Backplane Compatibility: Ensure the 1771 chassis is compatible and supports the required backplane current.
Product Applications
The Allen-Bradley 1771-DB module is widely used in industrial environments that require monitoring of DC signals from field devices. Typical applications include:
- Machine Control Systems: Monitoring pushbuttons, selector switches, and emergency stops.
- Material Handling: Detecting object presence or position via DC proximity sensors.
- Process Control: Reading status signals from valves, actuators, and relays.
- Automated Assembly Lines: Input signal acquisition for part detection and machine sequencing.
- Utilities and Infrastructure: Monitoring status indicators in power distribution and water treatment plants.
- Factory Automation: General-purpose digital input for control panels and HMIs.
Shipping Port: Xiamen, China
Payment: Bank of Chicago, Bank of Singapore
Express cooperation: fedex, DHL, UPS and your express account
Service: Professional Sales provides 24 hours /7 days online service
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