1. The so-called "sink type input" is an input form in which an input signal source is provided internally by plc, and one end of all input signals is integrated to the input common connection terminal COM. Also known as "point input." Figure 1. 
2. The so-called “source input†is a power supply that provides input signal power from the outside or uses the PLC to supply the input circuit. All input signals are “active†signals and input into the PLC input connection form independently. As shown in Figure 2. 
KNB6-63 Miniature Circuit Breaker
KNB6-63 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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