Digital guide
You are here:
AEG AS-B875-101
- Product Introduction: AEG AS-B875-101 is a dedicated 8-channel thermocouple input module for the Modicon 800 series PLC systems, designed for precise temperature measurement and monitoring using industrial thermocouples in process control and industrial automation applications. The module features built-in cold junction compensation (CJC), high-precision signal conditioning and support for multiple thermocouple types, with channel-to-channel isolation for reliable operation in noisy industrial environments. It integrates seamlessly with Modicon 800 series PLC chassis via the backplane bus, providing real-time temperature data with high accuracy and low latency, and is a key component for temperature control in manufacturing, process control and energy management applications.
- Technical Specifications:
- Number of Channels: 8 independent thermocouple input channels (isolated from each other and backplane bus)
- Supported Thermocouple Types: Software-configurable per channel – J, K, T, E, R, S, B, N (8 common industrial types)
- Measurement Range: Dependent on thermocouple type – J (-210°C to +1250°C), K (-270°C to +1372°C), T (-270°C to +400°C), E (-270°C to +900°C), R (0°C to +1768°C), S (0°C to +1768°C), B (400°C to +1820°C), N (-200°C to +1300°C)
Detailed content
-
- Resolution: 16-bit, 0.1°C (for temperature ranges <1000°C), 1°C (for temperature ranges >1000°C)
- Accuracy: ±0.3°C (at 25°C, for J/K/T/E), ±0.5°C (at 25°C, for R/S/N), ±1.0°C (at 25°C, for B) + 0.05% of reading
- Cold Junction Compensation (CJC): Built-in high-precision thermistor, ±0.2°C accuracy, automatic compensation for all channels
- Input Impedance: >10 MΩ (high input impedance to minimize signal loss)
- Isolation: Channel-to-channel isolation (1500 V AC), channel-to-backplane bus isolation (2500 V AC)
- Common Mode Rejection Ratio (CMRR): >120 dB (50/60 Hz), excellent rejection of electrical interference
- Sampling Rate: 10 samples per second (sps) per channel, simultaneous sampling for all channels
- Filtering: Software-configurable digital filter (0.1-10 s time constant) for noise reduction in noisy environments
- Communication: Modicon 800 series proprietary backplane bus, <1 ms latency for data transfer with CPU
- Programming: Supported by AEG Modicon 800 series PLC programming software, ladder logic/FBD function blocks for channel configuration and temperature scaling
- Power Supply: 24 V DC (from PLC chassis), power consumption <2 W
- Operating Temperature: -25°C to +70°C
- Storage Temperature: -40°C to +85°C
- Protection Class: IP20 (for cabinet mounting)
- Dimensions: 80 mm (W) x 160 mm (H) x 60 mm (D)
- Weight: 0.7 kg
- Compatibility: AEG Modicon 800 series PLC chassis (AS-B800, AS-B810, AS-B820), remote I/O racks (AS-P890, AS-J892)
- Functional Features:
- 8 independent software-configurable thermocouple input channels support 8 common industrial thermocouple types (J/K/T/E/R/S/B/N), adapting to a wide range of temperature measurement requirements in industrial applications
- Built-in high-precision cold junction compensation (CJC) with ±0.2°C accuracy eliminates the need for external CJC modules, ensuring accurate temperature measurement without additional hardware
- 16-bit high resolution and high accuracy (±0.3°C for J/K/T/E) deliver ultra-precise temperature data, enabling accurate temperature control in critical process control applications
- Channel-to-channel (1500 V AC) and channel-to-backplane bus (2500 V AC) isolation, combined with >120 dB CMRR, provides excellent rejection of electrical interference and ground loops, ensuring reliable operation in noisy industrial environments with high-power equipment
- Software-configurable digital filter (0.1-10 s time constant) reduces signal noise and vibration-induced errors, improving temperature measurement stability in harsh industrial environments
- Simultaneous 10 sps sampling per channel ensures real-time temperature data acquisition, enabling fast response to temperature changes in dynamic process control applications
- High input impedance (>10 MΩ) minimizes signal loss and loading effects, ensuring accurate temperature measurement even with long thermocouple cable runs
- Support for remote I/O rack integration allows the module to be mounted close to temperature measurement points, reducing cable length and signal interference, and improving measurement accuracy
- LED status indicators for each channel (power, active, fault) provide instant visual feedback on channel operation status, including open thermocouple and overrange faults, facilitating quick on-site troubleshooting
- Built-in open thermocouple detection and overrange/underrange fault signaling for each channel, triggering PLC alarms and control actions for abnormal temperature conditions
- Calibration-free design with on-board self-calibration circuitry ensures long-term measurement accuracy without regular manual calibration, reducing maintenance costs
- Rugged industrial design with wide operating temperature range (-25°C to +70°C) and industrial-grade components, ensuring stable operation in cold storage, high-temperature production lines and outdoor control stations
- Compact modular design saves space in PLC chassis and remote I/O racks, allowing integration with other digital/analog I/O modules for a complete temperature monitoring and control solution
- Seamless integration with Modicon 800 series PLC programming software, with pre-built function blocks for temperature scaling, alarm triggering and cold junction compensation, reducing programming time
- Application Scenarios:
- Temperature monitoring and control in chemical and petrochemical plants for reactor, distillation column and pipeline temperature measurement
- Food and beverage production for temperature control in baking, cooking, pasteurization and cold storage processes
- Pharmaceutical manufacturing for temperature monitoring and control in drug synthesis, drying and sterilization processes, meeting GMP requirements
- Metalworking and machining for temperature measurement of furnaces, molds and welding equipment in steel and aluminum production
- Power generation and distribution for temperature monitoring of turbines, generators, transformers and power cables
- Plastic and rubber manufacturing for temperature control in extrusion, injection molding and vulcanization processes
- Glass and ceramic production for high-temperature measurement of furnaces and kilns (up to 1820°C with B-type thermocouples)
- Water and wastewater treatment plants for temperature monitoring of treatment processes and equipment
- HVAC and building automation for temperature monitoring and control in commercial and industrial buildings
- Aerospace and automotive manufacturing for temperature measurement in material testing and production processes
