Compared with PLC temperature controller is much this five advantages -

Programmable logic controller ( PLC） And temperature controller in the field of manufacturing to ensure effective process control, quality is stable, and minimizing the user error has a protective effect.

process control equipment since the 17th century comes in a variety of forms, such as furnace temperature regulator and later in the 18th and 19th century steam engine, boiler fly ball valves and other mechanical system of speed governor, etc.

PLC is a kind of more modern tools, in the 20th century ( Especially in the 1970 s) With the growing demand for factory automation and appear. Before the PLC, its function is implemented by a series of mechanical components, these components installation and maintenance cost is extremely high, and is very complex, at the factory need to adjust ( Such as product line upgrade) Difficult to change.

however, although the temperature controller and PLC has many similarities, they are setup, programming, and applications will still be significantly different, and these different comprehensively, temperature controller has its own unique advantages:

1. Cost savings, of course, this is relatively, PLC controller is used to control the multitasking design, suitable for the application of multiple temperature loop control. For some single loop, or a few loop control of application, don't need many characteristics of PLC controller is applied, so the cost is high, it is not as good as choose specifically for temperature control design of the controller.

2。 Simple to set up as described above, PLC is designed for multitasking environment, so need professional programming skills and a lot of time, to meet specific application needs of the solution. While the temperature controller can be relatively quick installation, setup and optimization ( For example PID controller) Very few, and the required experience.

many temperature controller can be installed in a panel, which can be installed in the process of machinery on the front panel, and with visible screen, only the relevant personnel basic engineering knowledge can be set in a few minutes to complete. PLC is more complex, usually installed in the rack behind the panel, without display screen, and requires a separate HMI ( Also need to set up) So set on the convenience of obvious disadvantages.

3。 Temperature control function better temperature controller designed specifically for handling certain industrial processes, therefore contains is directly related to these processes, output, and the characteristics of control functions, such as for motor drive control valves ( VMD) The application of provide specialized algorithm. PLC requires suitable for extensive manufacturing and automation function characteristics, so in the light of the characteristics of temperature control is limited. They can perform the basic temperature control tasks, but not as a special temperature controller. In addition, because of the need to deal with analog signals, the temperature control system is very strict to the requirement of the microprocessor. Temperature controller is designed for dealing with these requirements, the PLC must be in the system after the test to determine whether meet the requirements of these processes. If you fail to conform to the requirements, the PLC will not be able to quick response in the process of all sorts of change, and lead to advance or delay, thus affecting the quality of products.

4。 Clear visual interface panel installation temperature controller has a variety of specifications and complexity, so the operator can easily see the process information, and need to be aware of the warning or alarm information. Instead of directly interface, PLC usually need a separate HMI, and HMI needs to be set separately. HIMI can display the necessary process information, but it usually also shows with PLC of other tasks related to the various data. This means that the panel installation type temperature controller is very obvious advantages, the special interface convenient and check all relevant information, can be quickly adjusted. Many temperature controller also provide additional data recording function, can be used to view the previous changes and mark a potential problem.

5。 Precision temperature controller is part of a closed feedback loop, the loop active tracking process value and the value of the deviation, and according to the need to adjust the power level. Many controller PID algorithm, and with automatic adjustment function, can realize quick setup, and keep the process value and setting of the minimum deviation. Including against accidental process changes or interrupts ( For example, the oven door open) The regulation. This to maintain the stability of the high product quality and reduce bad product batch is very necessary.

PLC sometimes PID function, but different from temperature controller, it is usually limited or need to engineer the features of the PID manual adjustment, which makes the programming time is longer, and bring the risk of human error. As mentioned earlier, the temperature control of the processor requirements may be very high, PLC for many other tasks at the same time may lead to more slowly, responding to the change process and precision will be lower than special temperature controller can achieve.

in process control applications, the temperature controller has multiple advantages relative to the PLC. They are installing and setting up faster, more rapid and simple operation, provide dedicated to the characteristics of temperature control, and because is designed for temperature control design, can satisfy the high requirements for process control.

if the system requirements for temperature controller can achieve higher automation level, the PLC is a more reasonable solution, but still recommend the use of special temperature controller to make up for the inadequacy of PLC in temperature control. To use special characteristics of temperature control, and can reduce the requirement of PLC, there won't be the problems of slow response and big deviation value, so as to ensure the high quality of the final product.

In today's world, have risen to an unexpected level of plc controller price. It has gained a lot of popularity and has come up with different kinds of variations in its content.
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