CFP-SG-140 - NI Strain/Bridge Input Module

Description

The cFP-SG-140 is a Strain/Bridge Input Module for Compact FieldPoint designed by National Instruments. The cFP-SG-140 is available under part number 777318-140. This module is used to measure full/half bridge strain gauges and is compatible with different sensors that are bridge-based. The NI cFP-SG-140 is a plug-and-play module, which means that the system can automatically detect modules. Thus, it offers a simple installation solution. The module needs little maintenance since it has an onboard diagnostic feature. The cFP-SG-140 also features a built-in excitation mode, which supports different programmable excitation levels. To ensure precise and accurate measurements, the cFP-SG-140 can be calibrated. The cFP-SG-140 Strain/Bridge Input Module has eight differential input terminals. The ADC resolution of the input terminal is 16 bits. A delta-sigma ADC is used in the cFP-SG-140. The impedance of the input terminals is 20 MΩ. The built-in excitation is user selectable and has different excitation voltages. The supported voltage levels are 2.5 V, 5 V, and 10V. The NI cFP-SG-140 is a low noise module with different noise filters. The user can select any filter depending upon the application requirement. The cFP-SG-140 features 15 Hz, 60 Hz, and 240 Hz filters. The range for the update time of all channels is 0.9 sec to 1.15 sec. Also, the device has a channel update rate of 1.11 to 0.87 Hz. The NI cFP-SG-140 can withstand 2300 Vrms of transient voltage. The continuous isolation voltage is up to 250 Vrms. The adjacent channels of the module are not isolated. The cFP-SG-140 has two green and eight red indicator lights. The green LEDs are for POWER and READY status indication. The red lights are associated with input channels. These lights indicate the overcurrent state of corresponding channels. The cFP-SG-140 weighs 3.7 oz, and measures 4.3 x 4.2 x 3.6 in. in physical dimensions. The NI device has recommended operating and storage temperature ranges of –40 to 70 °C and –55 to 85 °C respectively, a non-condensing relative humidity range of 10 to 90%, random and sinusoidal operating vibrations of 5 grms and 5 g respectively – all at a frequency range of 10 to 500 Hz.

One: PLC analog input module (analog input module), also known as A/D module, converts the continuous analog signal generated by the sensor detection in the field into the digital quantity that the PLC CPU can receive, generally 12-bit binary number, the more digital quantity modules, the higher the resolution. Two: PLC analog output module. The analog output module, also known as D/A module, converts the digital quantity sent by the PLC CPU to the analog output module into the analog quantity (voltage or current) that can be received by the external device. The digital signal received by the analog output module is generally 12-bit binary number, and the more digital quantity modules, the higher the resolution. The digital module is to detect the state of the external switching input. Three: Digital input and output signal is the switching signal, 0 or 1, analog signal, there are two, voltage or current signal, generally the signal transmitted by the transmitter, such as the pressure transformer to detect the pressure of the water pipe, it will output an analog signal 4-20ma or 0-10V signal to the PLC, PLC for data processing, This is the difference between a digital input module and an analog input module.

In the input sampling phase, the PLC successively reads all input status and data by scanning and stores them in the corresponding cell in the I/O image area. After the end of the input sampling, the user program execution and output refresh phase. In both phases, even if the input state and data change, the state and data of the corresponding unit in the I/O map area will not change. Therefore, if the input is a pulse signal, the width of the pulse signal must be greater than one scan cycle to ensure that the input can be read in any case. The acquisition of the switching quantity is realized through the PLC input module, which is generally a DC 24V input. The PLC provides a common point, positive or negative, and then the common point is connected to the limit switch and other devices. When the limit is closed, the path is formed and the signal is introduced into the PLC input point. Specifically why the input point to power inside the state is on, is the function of PLC itself, you do not need to tube. Through the analog module, A/D (analog/digital) module, the external weight signal, temperature signal, pressure signal can be introduced, A/D module can accept the signal is 0-10V, 0-5V, -5-5V voltage signal and 0-20MA, 4-20MA current signal. If the signal obtained by the terminal acquisition module is not these standard signals, but also through the transmitter conversion, after the standard signal enters the A/D module, it will be converted by A/D into a number, the specific range is different PLC is not the same, these converted digital quantities, can be used by the program, conversion, processing, and finally get the required data displayed.

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