1. Programmability of the controller in the constant temperature and Humidity Chamber
We all know that the controller of the constant temperature and Humidity Chamber is programmable by PLC. The input and output of a PLC are physically separated from each other and are implemented by running programs stored in its memory. Its entry and exit are related, not through physical processes, not through wiring; but through information processes, through soft logic. It works by making good use of information.
Unlike matter and energy, information has its own laws. Information is easy to process, easy to transmit, easy to store, information can be reused, and so on. It is because of these characteristics of this information that the basic characteristics of the PLC are determined.
PLC programming is very convenient: Although there are no actual relays, time relays and counters in the PLC, these devices actually exist through the program (software) and system memory. This number is unimaginable for a relay control system. Even a small PLC can have thousands of internal relays, and hundreds of time relays and counts. Furthermore, the contacts of these relays can be used an unlimited number of times. There are so many internal logic devices in PLC that users will not feel any restriction when using them.
2. Temperature and humidity test method in constant temperature and Humidity Chamber
First of all, we should understand the performance and use of the constant temperature and Humidity Chamber. Constant temperature and humidity Test Chamber is the main equipment for temperature and humidity test. Through the scientific operation test of the equipment, the temperature and humidity test is carried out on the test object. Generally speaking, it is tested in a specific temperature and humidity environment. The use of constant temperature and Humidity Chambers can effectively test product quality and safety performance.
When using a programmable constant temperature and Humidity Chamber, some users who are in contact with the equipment for the first time will be curious about the specific meaning and channel of temperature and humidity programming, and what convenient help will it bring to the experiment? Today we will explain it through a practical case.
For example, a customer is testing a PCBA product. The test conditions are set at a high temperature of 50°C for 7 hours, at -30°C for 6 hours, and run at a high temperature of 80°C and a humidity of 85% for 2 hours. If implemented continuously run the test.
In order to meet the above multiple test requirements and conduct tests without interruption, the temperature and humidity program can be programmed on the controller of the constant temperature and Humidity Chamber before the start of the test operation. The Test Chamber will carry out accurate tests according to the test procedures.
Now many constant temperature and Humidity Chambers have realized the function of network operation, and various temperature and humidity programming can be edited on the mobile phone or computer, which more conveniently releases the limitation of space and time.
The PLC programming in the constant temperature and Humidity Chamber also has a wealth of external equipment, which can establish a friendly man-machine interface for information exchange. Programs can be entered, data can be entered, programs can be read, and data can be read. Reading and writing can be done on the screen with pictures and text. After reading the data, it can be dumped and printed. Data entry can be keyed, card readable, etc.
PLC programming also has a communication interface, which can be connected or networked with a computer to exchange information with the computer. It can also network itself to form a larger and wider control system that cannot be possessed by a single machine. PLC programming also has a powerful self-test function for self-diagnosis. Results are recorded automatically. This increases the transparency and ease of its maintenance.
