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1746-NR8
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Product Description
The 1746-NR8 input module is an SLC 500 series 8-channel RTD/resistance input module that is made by Allen-Bradley. It can communicate with 8 RTBs at a time and the RTBs can be made from different materials.
Other Available Revisions for the 1746-NR8 1746-NR8//A
Common misspellings:
- l746-NR8
- 17A6-NR8
- 1746-NRb
- 1746NR8
The Allen Bradley 1746-NR8 is a RTD input module (analog). It has 8 input points and belongs to the SLC 500 series, drawing a backplane current of 100 mA at 5 Volts DC and 55 mA at 24 Volts DC. It has a backplane power consumption of 0.5 Watts at 5 Volts DC and a maximum 1.32 Watts at 24 Volts DC. Its 8 channels are all backplane isolated, and the module can be installed in all I/O module slots apart from slot 0 in the I/O chassis.
The 1746-NR8 uses sigma-delta modulation for its A/D conversion method. It has a low-pass digital filter with programmable filter frequencies and a common mode rejection greater than 120 dB at 50 Hertz or 60 Hertz between the chassis ground and the inputs. It has a maximum of +/- 1 Volt common mode voltage, a voltage of +/- 5 Volts DC, a current of +/- 5 mA permanent overload (max), a cut-off frequency of 7.80 to 1676 Hertz at 28 to 6400 Hertz input filter frequency, and it auto-calibrates itself immediately when power is supplied or on channel enabling by detecting a change on its input/filter frequency or current (excitation).
The optical isolation between the backplane and the inputs is tested at 500 Volts for a single minute. It has a +/- 5 Volt DC separation between inputs and has 9 LED indicators: one for each channel, and one for the 1746-NR8 module status. It has a 25 Ohms (maximum) cable resistance for a 3-wire RTD setting and uses the 1746-RT35 terminal block. The 1746-NR8 operates at temperatures of 0 to 60 degrees Celsius and is stored at -40 to 85 degrees Celsius. It has a rating of 5% to 95% relative humidity in a non-condensing environment.
This unit accommodates copper, iron-nickel, nickel and platinum RTD input types. Individual input channels on the 1746-NR8 provide an excitation current, resistance detection on the lead-wire, and a return connection through an RTD connection with which communication between the 1746-NR8 RTD module and the SLC processor is initiated.
Data exchanges with the 1746-NR8 analog input module are accomplished with use of an image table which has 8 I/O words when class 1 configured; when configured to be used in a class 3 operation, it has 16 input and 24 output words.
Technical Specifications for 1746-NR8
| Manufacturer | Allen-Bradley / Rockwell Automation |
|---|---|
| Series | SLC 500 |
| Part Number | 1746-NR8 |
| Product Type | RTD/Resistance Input Module |
| Number of Inputs | 8 |
| Maximum Number of Supported RTDs | 8 |
| Supported RTD Types | Nickel RTDs, Copper RTDs, Platinum RTDs, or Nickel-Iron RTDs |
| External Power Supply | Not Required |
| Operating Temperature | 32 to 140 degrees Fahrenheit |
| Storage Temperature | -40 to 185 degrees Fahrenheit |
About 1746-NR8
The Allen-Bradley 1746-NR8 module is an SLC 500 series RTD/resistance input module. The 1746-NR8 input module comes with 8 input channels which receive data that the module can store. The data that it collects and stores is analog data that has been digitally converted and that is supplied by RTDs or devices like potentiometers. The 1746-NR8 input module can connect to up to 8 RTDs at a time, and the RTDs can be nickel RTDs, copper RTDs, platinum RTDs, or nickel-iron RTDs. At 5 Volts DC, the 1746-NR8 input module consumes 100 milliamps of maximum backplane current, and at 24 Volts DC, the module consumes 55 milliamps of backplane current. It can draw all of the power that it needs from the backplane and it does not require an external power supply.
The Allen-Bradley 1746-NR8 RTD/resistance input module’s 8 input channels are all isolated at the backplane. When this module is installed in an I/O chassis, it can be installed in any of the available slots except for Slot 0. The input filtering method that the 1746-NR8 input module uses is a low-pass digital filter that has programmable filter frequencies. It has 9 status indicators that are green LEDs. Eight of these status indicators are for the input channels and the ninth indicator is for the input module as a whole. Its operating temperature range is from 32 to 140 degrees Fahrenheit while its storage temperature range is from -40 to 185 degrees Fahrenheit, and its operating and storage humidity ratings are 5 to 95% relative humidity with no condensation.
The 1746-NR8 input module is an SLC 500 series 8-channel RTD/resistance input module that is made by Allen-Bradley. It can communicate with 8 RTBs at a time and the RTBs can be made from different materials.
