Allen-Bradley|1746-NR4| four-channel RTD/resistance input module
Description
The 1746-NR4 is a four-channel RTD/resistance input module for SLC 500 controllers, converting analog data from RTD units or other resistance inputs into digital form for processing by the controller.
Features
- Up to 4 RTD/resistance inputs (2-, 3-, or 4-wire connections)
- Supports various RTD types (e.g., platinum, nickel, copper)
- Configurable for temperature (°C, °F) or resistance (ohms) output
- On-board scaling and broken sensor detection
- LED indicators for status and error reporting
Technical Specifications
- Operating Temperature Range: 0°C to 55°C (32°F to 131°F) in most slots; 0°C to 60°C (32°F to 140°F) in the rightmost slot
- Sample Time per Channel: 0.75 msec
- Module Update Time: 0.75 msec (1 channel) to 6.00 msec (8 channels)
- Input Impedance: 1 MΩ
- Filter Frequencies: 1 Hz to 75 Hz
- Turn-On Time: 101 to 107 msec
- Turn-Off Time: 1 to 7 msec
- Reconfiguration Time: 101 to 107 msec
- Maximum Source Impedance: Below 500 ohms
- Excitation Currents: 0.5 mA and 2.0 mA
-
Temperature Ranges (Platinum 385):
- 0.5 mA: -2000…8500 counts (-200…850 °C)
- 2.0 mA: -2000…2400 counts (-200…240 °C)
- Communication: Backplane communication with SLC processor using an image table of 8 input words and 8 output words
Allen-Bradley|1746-NR4| four-channel RTD/resistance input module


Allen-Bradley|1746-NR4| four-channel RTD/resistance input module
Description
The 1746-NR4 is a four-channel RTD/resistance input module for SLC 500 controllers, converting analog data from RTD units or other resistance inputs into digital form for processing by the controller.
Features
- Up to 4 RTD/resistance inputs (2-, 3-, or 4-wire connections)
- Supports various RTD types (e.g., platinum, nickel, copper)
- Configurable for temperature (°C, °F) or resistance (ohms) output
- On-board scaling and broken sensor detection
- LED indicators for status and error reporting
Technical Specifications
- Operating Temperature Range: 0°C to 55°C (32°F to 131°F) in most slots; 0°C to 60°C (32°F to 140°F) in the rightmost slot
- Sample Time per Channel: 0.75 msec
- Module Update Time: 0.75 msec (1 channel) to 6.00 msec (8 channels)
- Input Impedance: 1 MΩ
- Filter Frequencies: 1 Hz to 75 Hz
- Turn-On Time: 101 to 107 msec
- Turn-Off Time: 1 to 7 msec
- Reconfiguration Time: 101 to 107 msec
- Maximum Source Impedance: Below 500 ohms
- Excitation Currents: 0.5 mA and 2.0 mA
-
Temperature Ranges (Platinum 385):
- 0.5 mA: -2000…8500 counts (-200…850 °C)
- 2.0 mA: -2000…2400 counts (-200…240 °C)
- Communication: Backplane communication with SLC processor using an image table of 8 input words and 8 output words