ABB 500TRM02 1MRB150011R0001 Temperature Input Module

Thermocouples (e.g., types K, J, T, E, R, S, B): Obtain temperature by measuring thermoelectromotive force.

Resistance Temperature Detectors (RTDs): Such as PT100, PT1000, which measure temperature using the characteristic that resistance changes with temperature.

Analog Input (4-20mA/0-10V): Compatible with standard signals output by other temperature transmitters.

Supported Sensor Types:

Interface Design:
Connects sensors via terminal blocks, supports shielded wire access to reduce electromagnetic interference. Each module typically includes 8 independent channels (specific to the model).

Signal Conditioning:
Amplifies and filters the weak signals output by sensors (such as mV-level voltage from thermocouples and resistance changes from RTDs) to eliminate noise interference.

A/D Conversion:
Converts analog signals into digital quantities through high-precision analog-to-digital converters (such as 16-bit ADC). The conversion accuracy determines the resolution of temperature measurement (e.g., ±0.1℃).

Linearization Calculation:
The output of sensors is not strictly linear with temperature (e.g., the electromotive force-temperature curve of thermocouples is nonlinear). The module has built-in algorithms (such as polynomial fitting and look-up table methods) to linearize raw data and restore the true temperature value.

Calibration Mechanism:
Supports hardware calibration (via external standard sources) and software calibration (setting offset and gain coefficients in PLC programming software) to ensure measurement accuracy.

Digital Encoding:
The digital values after A/D conversion are parsed by the internal processor (such as a microcontroller) of the module, and temperature values are calculated by combining sensor type parameters (such as the PT100 graduation table).

Engineering Unit Conversion:
Converts digital quantities into engineering units (℃ or ℉) and stores them in the module's registers (such as the input image area) for the PLC main controller to read.

Backplane Bus Communication:
Interacts with the CPU module in real-time via the backplane bus (such as the S2 bus) of the AC 500 rack. The PLC periodically scans the module registers to obtain temperature measurement values.

Data Transmission Protocol:
Follows the internal communication protocol defined by ABB, supporting high-speed data exchange (such as a refresh cycle ≤1ms per channel) to ensure real-time performance.

Electrical Isolation:
Photoelectric isolation (isolation voltage ≥500VAC) is adopted between each channel and internal circuits to prevent on-site interference from affecting module operation.

Fault Detection:
Monitors abnormal states such as sensor disconnection, short circuit, and out-of-range in real-time, alarms through LED indicators (such as ERROR, CHx FAULT), and sends fault codes to the PLC.

Cold Junction Compensation (for thermocouples):
Thermocouple measurement requires the known temperature of the reference junction (cold junction). The module has a built-in temperature sensor to monitor its own temperature and automatically compensate for cold junction errors.

Environmental Temperature Adaptation:
The operating temperature range is typically -20℃ to +60℃. Through hardware heat dissipation design and software temperature drift correction, stability in industrial environments is ensured.