Allen Bradley 1746-NR4 | SLC 4 Point Resistance Input Module

 

Description

The Allen-Bradley 1746-NR4 module is an RTD/resistance input module. It is part of the SLC 500 product line. The module receives and stores analog data from resistance inputs and RTD units. The received analog data is first converted to digital data before being stored in the image table of the I/O module. Modular SLC processors can access the image table of the 1746-NR4 module and retrieve the stored information. Four channels are available on the 1746-NR4 input module. A small current is supplied to each RTD unit that is connected to the inputs on the module. On-board scaling is applied by the module which converts RTD inputs to temperature reports or reports the measured resistance in ohms. Open or short circuit broken sensor detection is supported by the 1746-NR4 module. The module can also detect if an input signal is out of range.

The Allen-Bradley 1746-NR4 SLC 500 RTD/resistance input module has Four (4) channels available that are backplane-isolated. The module's A/D conversion method is sigma-delta modulation. This module is compatible for installation to a fixed style or modular hardware SLC 500. The 1746-NR4 also comes with input filtering, particularly a low-pass digital filter that has programmable frequencies. LED status indicators are present on the 1746-NR4 module, specifically 5 indicators made up of 1 indicator for the status of the module itself and 4 indicators for the module's channels, with 1 indicator for every channel. RTD types compatible for this module are Nickel Iron, Nickel, Copper, and Platinum. Note that this module does not require an external power supply and it does a self-calibration automatically when the filter frequency, input type, or excitation current, or when a channel is enabled. The backplane current consumptions of the 1746-NR4 module are 50 mA each at both 5 Volts DC and 24 Volts DC, and its maximum backplane power consumption is 1.5 Watts, with 0.3 Watts at 5 Volts DC and 1.2 Watts at 24 Volts DC. The maximum permanent overloads this module can handle are +/- 5 Volts DC for Volts and +/- 5 mA for the current and its maximum common-mode voltage is +/- 1 Volt. The optical isolation of the 1746-NR4 is 500 Volts DC for 1 minute between both the inputs and the chassis ground and between the inputs and the backplane. The 1746-NR4 also works at an operating temperature of 0 to 60 degrees Celsius and it can be stored at a non-operating temperature of -40 to 85 degrees Celsius.

The RTD module communicates with the SLC processor through thebackplane of the chassis. The RTD module transfers data to andreceives data from the processor by means of an image table. Theimage table consists of eight input words and eight output words.Data transmitted from the module to the processor is called the inputimage (for example, Channel Data Words and Channel Status Words).Conversely, data transmitted from the processor to the module iscalled the output image (for example, Channel Configuration Wordsand Scaling Limit Words).

The Channel Configuration Words (output image) containuser-defined configuration information for the specified input channel.This information is used by the module to configure and operate eachchannel. The Channel Status Words (input image) contain statusinformation about the channel's current configuration and operationalstate. The input data values of the analog input channel are containedin the Channel Data Word (input image), which is valid only when thechannel is enabled and there are no channel errors (for example,broken sensor or overrange.)You set the Scaling Limit Words (output image) to provide a definablescaling range for the temperature resistance data when using theproportional counts data type.

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