Honeywell 2MLF-RD4A RTD Input Module
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Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | Honeywell |
| Model | 2MLF-RD4A |
| Product Name | RTD Input Module |
| Product Series | MasterLogic-200 |
| Product Type | Resistance Temperature Detector Input Module |
| Number of Input Channels | 4 Channels |
| Supported RTD Sensors | Pt100, JPt100 |
| Pt100 Standard | JIS C1604-1997 |
| JPt100 Standards | JIS C1604-1981, KS C1603-1991 |
| Pt100 Temperature Range | -200.0 to 850.0°C |
| JPt100 Temperature Range | -200.0 to 640.0°C |
| Temperature Display Resolution | 0.1°C / 0.1°F |
| Digital Output Format | Temperature display or user-defined scaling |
| User-Defined Scaling Range | 0–65535 or -32768–32767 |
| RTD Wiring Method | 3-wire |
| Accuracy at 25°C | ±0.2% or less |
| Accuracy at 0–55°C | ±0.3% or less |
| Conversion Speed | 40 ms per channel |
| Channel-to-Channel Isolation | Non-isolated |
| Terminal-to-PLC Power Isolation | Photocoupler isolation |
| Averaging Functions | Time average, counting average, moving average |
| Time Averaging Range | 320–64,000 ms |
| Counting Average Range | 2–64,000 counts |
| Moving Average Range | 2–100 samples |
| Alarm Functions | Process alarm, input changing-rate alarm, sensor disconnection detection |
| Digital Filter | 160–64,000 ms |
| Terminal Block | 18-point terminal |
| I/O Points Occupied | 64 fixed points or 16 flexible points |
| Current Consumption | 450 mA at 5 V DC |
| Dimensions | 113 × 27 × 98 mm |
| Weight | 0.15 kg |
FAQ
1. What is the main function of the Honeywell 2MLF-RD4A?
The 2MLF-RD4A is a four-channel RTD input module for the Honeywell MasterLogic-200 PLC system. It receives resistance signals from temperature sensors, converts them into digital temperature values, and makes the measurement data available to the PLC for monitoring, alarm handling, and process control.
2. Which RTD sensor types are supported by the 2MLF-RD4A?
The module supports Pt100 and JPt100 resistance temperature detectors. Pt100 sensors follow JIS C1604-1997, while JPt100 sensors follow JIS C1604-1981 and KS C1603-1991. The sensor type selected in the module configuration must match the sensor installed in the field.
3. What temperature ranges can the module measure?
For Pt100 sensors, the specified measurement range is -200.0 to 850.0°C. For JPt100 sensors, it is -200.0 to 640.0°C. The module can display temperature values in Celsius or Fahrenheit, with a display unit of 0.1 degree.
4. Why does the 2MLF-RD4A use three-wire RTD connections?
The three-wire configuration helps compensate for the resistance of the sensor lead wires, reducing measurement errors caused by cable resistance. All three wires must be connected to the correct terminals, and the cable arrangement should follow the module’s wiring diagram. Incorrect wiring can cause unstable or inaccurate temperature readings.
5. What are the measurement accuracy and conversion speed of the 2MLF-RD4A?
The specified accuracy is within ±0.2% at an ambient temperature of 25°C and within ±0.3% over the 0–55°C operating range. The conversion time is 40 ms per channel. Since channels are converted sequentially, the PLC application should account for the update interval when monitoring rapidly changing temperatures.
6. What averaging and filtering functions are available?
The module supports time averaging, counting averaging, and moving averaging to reduce fluctuations in temperature readings. It also provides a digital filter with a configurable range of 160–64,000 ms. Increasing the averaging or filtering time can produce steadier readings, but it may also slow the response to actual temperature changes.
7. How does the 2MLF-RD4A detect RTD sensor faults?
The module provides sensor disconnection detection and input changing-rate alarms, as well as process alarms. If a temperature value becomes abnormal or a sensor connection is lost, check the RTD wiring, terminal contacts, sensor condition, and configured alarm limits. Comparing the affected channel with a known-good sensor can help identify whether the fault is in the sensor or the input circuit.
8. What should be checked when replacing or commissioning a 2MLF-RD4A?
Confirm that the replacement is the correct model and is compatible with the MasterLogic-200 PLC system. Record the existing Pt100 or JPt100 selection, channel assignments, scaling, filtering, and alarm settings. Check the three-wire connections and terminal assignments before powering up. After installation, compare each channel’s displayed temperature with a reference measurement and verify sensor-disconnection alarms and PLC data updates.
Honeywell 2MLF-RD4A RTD Input Module is in stock. Please contact us for a quick quote and competitive pricing.
| Company Information | ||||||||
| [email protected] | ||||||||
| Mobile | +8613666084105 | |||||||
| +8613666084105 | ||||||||
| 13666084105 | ||||||||
| Add to | Room 1004, No. 62 Xiangxiu Li, Siming District, Xiamen City, Fujian Province, China | |||||||
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