CFP-TC-125 - NI Temperature Input Module

Description

The NI cFP-TC-125 (Part Number: 777318-125) can be mounted on a cFP-BP-x or cFP-180x Compact FieldPoint backplane. This results in delivering functioning power to the module. This module has built-in linearization and cold-junction compensation for eight types of thermocouples: B, J, E, R, K, S, N, and T. In addition, the cFP-CB-x Connector Block has connections for the eight differential input channels on the NI cFP-TC-125 module. The user should keep in mind that they should not link anything to the V and C terminals on the connector block. Each of the eight channels on the cFP-TC-125 Temperature Input Module rejects as much as ±250 V common-mode voltage as referenced to earth ground. However, the user must ensure the difference in common-mode voltage between any two channels does not go over 250 V. To link voltage input signals, the user should link the positive lead of a millivolt signal to the IN(+) terminal and the negative lead to the IN(-) terminal. The voltage input range is from -20 to 80 mV. An input signal not falling within this range will result in the NI cFP-TC-125 module reporting an Out of range error for the affected channel. Additionally, if the user chooses the -20 to 80 mV range for an input channel in software, then choosing a thermocouple type for that channel will not change anything.

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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