Common devices for programming PLCs are handheld programmers and computer programming. In the early days of programmable controller development, a dedicated programmer was used to program. Small programmable controllers use a cheaper, portable handheld programmer, while large and medium programmable controllers use a portable programmer with a small CRT as the display. A dedicated programmer can only program certain products from a certain manufacturer and has a limited range of uses. Handheld programmers can't directly input and edit ladder diagrams. They can only input and edit commands, but they are small in size, easy to carry, and can be used for on-site debugging, which is cheap.
The popularity of computers has led more and more users to use personal computer-based programming software. At present, some programmable controller manufacturers or distributors provide programming software to users, and add appropriate hardware interfaces and software packages on the personal computer to program the PLC with a personal computer . Using the microcomputer as a programmer, the ladder diagram can be directly compiled and displayed, and the program can be saved, printed, and debugged, which is very advantageous for finding faults.
KNB1-63 Miniature Circuit Breaker
KNB1-63 Mini Circuit breakers, also named as the air switch which have a short for arc extinguishing device. It is a switch role, and also is a automatic protection of low-voltage electrical distribution. Its role is equivalent to the combination of switch. Fuse. Thermal Relay and other electrical components. It mainly used for short circuit and overload protection. Generally, According to the poles, mini Circuit breaker can be divided into 1P , 1P+N , 2P, 3P and 4P.
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