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AEG AS-B875-011 Modicon AS-B875-011 8-Channel RTD Input Module
- Product Introduction: AEG AS-B875-011 is a high-precision 8-channel resistance temperature detector (RTD) input module exclusively designed for the Modicon 800 series PLC systems, optimized for accurate and stable temperature measurement in industrial process control, manufacturing and instrumentation applications. The module features built-in signal conditioning, excitation current regulation and support for all mainstream industrial RTD types, with channel-to-channel electrical isolation to eliminate interference in noisy industrial environments. It integrates seamlessly with Modicon 800 series PLC chassis via the proprietary backplane bus, delivering real-time temperature data with ultra-low latency, and is a core component for high-precision temperature monitoring and closed-loop control systems requiring consistent, drift-free measurements.
- Technical Specifications:
- Number of Channels: 8 independent RTD input channels (fully isolated channel-to-channel and channel-to-backplane)
- Supported RTD Types: Software-configurable per channel – Pt100 (2/3/4 wire), Pt200, Pt500, Pt1000, Ni100, Ni1000 (6 industrial standard types)
- Measurement Range: -200°C to +850°C (Pt100/Pt200/Pt500/Pt1000); -60°C to +200°C (Ni100/Ni1000)
- Resolution: 16-bit, 0.01°C (range -100°C to +200°C); 0.1°C (range -200°C to -100°C / +200°C to +850°C)
- Accuracy: ±0.1°C (at 25°C, 3-wire Pt100); ±0.2°C (2/4-wire Pt100); ±0.3°C (Ni-based RTDs) + 0.02% of reading
Detailed content
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- Excitation Current: 1 mA constant current (per channel, selectable 0.5 mA/2 mA via software)
- Input Impedance: >100 MΩ (high impedance to minimize signal loading and loss)
- Wire Compensation: Built-in 3/4-wire auto-compensation (eliminates lead wire resistance errors for long cable runs)
- Isolation Voltage: 1500 V AC (channel-to-channel); 2500 V AC (channel-to-backplane bus)
- CMRR: >130 dB (@50/60 Hz) – ultra-high noise rejection for industrial electrical environments
- Sampling Rate: 15 samples per second (sps) per channel, simultaneous sampling for all channels
- Digital Filter: Software-configurable 1st/2nd order filter (0.05s–20s time constant) for vibration/noise reduction
- Communication: Modicon 800 series proprietary backplane bus, <0.8 ms data transfer latency with PLC CPU
- Power Supply: 24 V DC (derived from PLC chassis), power consumption <2.2 W
- Operating Temperature: -25°C to +70°C
- Storage Temperature: -40°C to +85°C
- Protection Class: IP20 (cabinet-mounted)
- Dimensions: 80 mm (W) × 160 mm (H) × 60 mm (D)
- Weight: 0.75 kg
- Compatibility: Modicon 800 series PLC chassis (AS-B800/810/820), remote I/O racks (AS-P890/AS-J892)
- Functional Features:
- 8 fully isolated channels prevent ground loops and electrical interference between measurement points, ensuring accurate readings in environments with high-power VFDs, motors and welding equipment
- Built-in 3/4-wire auto-compensation eliminates lead wire resistance errors, enabling precise temperature measurement even with 100+ meter RTD cable runs
- Constant current excitation (1 mA default) minimizes self-heating of RTD elements, avoiding measurement drift caused by sensor temperature rise
- Software-configurable RTD type and excitation current per channel allow mixed RTD usage in a single module, maximizing system flexibility and reducing hardware costs
- 16-bit high resolution and ultra-low accuracy error deliver drift-free temperature data for critical closed-loop control applications (e.g., pharmaceutical manufacturing, semiconductor processing)
- Simultaneous sampling ensures time-synchronized temperature measurements across all channels, critical for multi-point process monitoring and thermal profiling
- Configurable digital filtering balances measurement speed and stability, adapting to both dynamic temperature changes (fast processes) and static monitoring (tanks, pipelines)
- Built-in fault detection (open circuit, short circuit, overrange) for each channel, with real-time fault signaling to the PLC CPU for alarm triggering and system safety
- LED status indicators (power, active, fault) for each channel provide instant visual diagnostics, reducing on-site troubleshooting time
- Calibration-free design with on-board self-calibration circuitry maintains long-term accuracy without manual adjustment, lowering maintenance costs
- Compact modular form factor saves chassis space, enabling integration with other digital/analog I/O modules for a complete automation solution
- Application Scenarios:
- Pharmaceutical and biotech manufacturing for high-precision temperature monitoring of reactors, fermenters and lyophilizers (GMP-compliant processes)
- Food and beverage production for temperature control of pasteurization, baking and cold storage lines (HACCP compliance)
- Chemical and petrochemical processing for multi-point temperature monitoring of pipelines, storage tanks and distillation columns
- Semiconductor and electronics manufacturing for ultra-precise thermal control of clean room equipment and wafer processing tools
- Power generation for temperature monitoring of turbine bearings, transformers and generator windings (preventative maintenance)
- Water and wastewater treatment for monitoring digester, clarifier and heat exchanger temperatures
- Metalworking and machining for thermal profiling of furnaces, molds and CNC machine tool components
- HVAC and building automation for high-accuracy temperature control in data centers, laboratories and industrial clean rooms
- Aerospace and automotive testing for thermal characterization of components under extreme temperature conditions
- Industrial refrigeration for multi-point temperature monitoring of cold storage warehouses and transport systems
