WhatsApp:+86 18150087953 WeChat: +86 18150087953 
Email：
Application Scenarios
In a chemical processing plant, the control system relies on dozens of 4-20mA transmitters monitoring tank levels, pipeline pressures, and reactor temperatures. The existing analog input cards were suffering from漂移 and noise issues, causing erratic readings and unnecessary alarms. By deploying the B&R 3AI775.6, engineers gained access to 8 differential channels with excellent common-mode rejection. The module’s built-in 450Hz first-order low-pass filter effectively eliminated high-frequency interference from nearby variable frequency drives, restoring stable, noise-free readings . With conversion times below 1ms, the B&R 3AI775.6 ensures that time-critical process values are updated rapidly, enabling tighter control loops and reducing product variability.
Parameters
| Main Parameters | Value/Description |
|---|---|
| Product Model | B&R 3AI775.6 |
| Manufacturer | B&R Industrial Automation |
| Product Category | Analog Input Module |
| Number of Inputs | 8 differential inputs |
| Input Signal | 0 to 20 mA nominal, -50 to +50 mA maximum (overrange protection) |
| A/D Converter Resolution | 12-bit |
| Conversion Time (All Channels) | Normal mode: <1 ms; with averaging: <1.5 ms |
| Electrical Isolation | Input – PLC: Yes; Channel – Channel: No |
| Basic Accuracy | ±0.1% at 25°C |
| Input Filter | 1st-order low-pass, cutoff frequency 450 Hz |
| Power Consumption | 5 VDC: 1.0 W; 24 VDC: 3.5 W; Total: 4.5 W |
| Load Impedance | 50 Ω |
| Operating Temperature | 0 to 60°C |
| Certifications | CE, UKCA, cULus (E115267, Industrial Control Equipment) |
| Required Accessory | Terminal block TB170 (ordered separately) |
Technical Principles and Innovative Values
- Innovation Point 1: High-Speed Successive Approximation Conversion for Real-Time Control
The B&R 3AI775.6 employs a successive approximation A/D converter, delivering a total conversion time of under 1ms for all 8 channels in normal operation . This rapid update rate ensures that control loops receive fresh data with minimal latency, a critical advantage in applications such as fast-flow filling lines or pressure control systems where response time directly impacts product quality and throughput. - Innovation Point 2: 12-Bit Resolution with ±0.1% Accuracy for Reliable Measurement
With a 12-bit digital resolution and a basic accuracy of ±0.1% at 25°C, the B&R 3AI775.6 provides consistent and trustworthy data acquisition . Temperature drift is carefully managed—offset drift is limited to ±0.0025%/°C and gain drift to ±0.01%/°C—ensuring that measurement stability is maintained even as cabinet temperatures fluctuate during production . This translates to fewer recalibrations and greater confidence in process data. - Innovation Point 3: Three Flexible Operating Modes for Diverse Application Needs
The B&R 3AI775.6 supports three operating modes to accommodate different measurement requirements :- Normal Mode: Cyclic measurement with optional averaging for stable readings in noisy environments.
- Special Mode 1: Direct software timing, ideal for applications requiring precise synchronization with other system events.
- Special Mode 2: Software timing with a configurable time window (2000–65535 µs), offering fine-grained control over the sampling schedule. This flexibility allows the B&R 3AI775.6 to adapt to both general-purpose monitoring and advanced, timing-critical applications.
- Innovation Point 4: Robust Electrical Isolation and Protection for System Safety
The B&R 3AI775.6 provides electrical isolation between the input channels and the PLC backplane, protecting the central controller from potentially damaging field wiring faults or voltage transients . The module also tolerates a wide input range (-50 to +50 mA), safeguarding against accidental overcurrent conditions that could otherwise damage the input circuitry and cause costly downtime .
