Connection of temperature sensor and PLC

Temperature sensor is a kind of commonly used temperature measurement instrument. In fact, when the temperature sensor is used, it is rarely used alone. Generally, it is used with a data collector or a PLC. The most common one is the PLC. So how can a temperature sensor be connected to a PLC?

1, the temperature sensor as an accurate temperature change resistor, different temperature resistance, PLC special resistance module can measure the resistance through the internal calculation of the actual temperature value, because the cable has a length, will affect the accuracy of the measurement, will do resistance make up.

2. The cold junction temperature also affects the measurement accuracy, so there will be cold junction compensation.

3, temperature sensor combined with the transmitter will analog signal, such as 4-20ma, 0-5v directly connected to the PLC, PLC read the signal, the program set up the corresponding temperature of 4mA and 20mA, you can calculate the sensor display temperature .

4, the temperature sensor output digital, PLC can be directly accepted by the digital module.

Knowing how the temperature sensor is connected to the PLC helps us to install and use the temperature sensor. Especially in the factory, the connection of the temperature sensor to the PLC is very common. Several ways of connecting the temperature sensor and the PLC have their own advantages and disadvantages. How to connect it specifically depends on the specific use environment.