PLC is very popular nowadays, which is almost universally used in the development of industrial production and technology, and gradually replaces the traditional contactor control and relay control system. Many people can't help but ask: How does PLC replace the traditional relay control and contactor control system?
PLC has multiple functional elements.
There are many components with different functions in the PLC. These components are composed of electronic circuits and memories. For example, the input relay (X) is composed of the input circuit and the input shadow register, the output relay (Y) is composed of the output circuit and the output shadow register, timer (T), counter (C), auxiliary relay (M), The state relay (S), data register (D), index register (V, Z), etc. are all composed of memory.
In order to distinguish it from ordinary hardware components, these components are usually called soft components. They are equivalent abstract analog components, not actual physical components. In terms of working process, we only pay attention to the functions of components, give names according to the functions of components, and each component has a definite address number.
1. The input relay (X); it is connected to the input terminal of the PLC and is the gate for the PLC to receive the external switch signal. The PLC reads and stores the external signal status in the input image register through the input terminal. The input relay connected to the input terminal is a photoelectric isolation electronic relay. In the PLC program, there are many moving closing contacts and moving breaking contacts.
For example, the input relay of FX2NPLC adopts octal address number, such as Xo ~ X7, X10 ~ X17, X20 ~ X27, etc. Refer to the following diagram for the wiring diagram of PLC input signal:
If the start button SB1 signal and the stop button SB2 signal are sent to the PLC, one end is connected to Xo for X1, and the other end is connected to the CoM field of the input terminal, and the corresponding button switch signal can be sent to the PLC. If the SB1 button is in the 0FF state, all the contacts of Xo in the PLC program are kept in their original state, that is, the dynamic closing contact remains open, and the dynamic breaking contact remains closed. If the SB1 button is in the 0N state, all contacts of X0 in the pLC program must be activated, that is, the dynamic breaking contact is opened, and the dynamic closing contact is closed.
2. The output relay (Y); the output relay is connected to the output terminal of the PLC, which is the window through which the PLC sends signals to the external load. The output relay is used to transmit the output signal of the PLC to the output unit, and then the output unit drives the external load. In the PLC program, there are coils and contacts of the output relay. The coil usually only appears once in the program, and its contacts can be unlimited. The address number is similar to the input relay, using octal address number, such as Y0 ~ Y7, Y10 ~ Y17, Y20 ~ Y27, etc.
When the Y0 coil status in the PLC program is turned on to 0N, all the contacts of Y0 in the program will be activated, the closing contact will be closed, and the dynamic contact will be open. And in the peripheral circuit (as shown in the figure above), the Y0 terminal and the C0M1 terminal will be connected, then the load HL1 controlled by Y0 will turn on its working power and light. When the coil of Y0 in the program is opened to 0FF, all the contacts of Y0 in the program remain in their original state, the closing contact is opened, and the closing contact is closed. And in the peripheral circuit, the Y0 terminal and C0M1 terminal will be disconnected, then the load HL1 controlled by Y0 is not turned on, and the lamp controlled by its working power supply is not lit.
Learning PLC relies on teachers to teach a part, mainly relying on their own hands, and to systematically learn a series of knowledge of PLC. It's a little difficult to get started at first. When you taste the fun, you can say that you are reluctant. One step at a time when learning, from shallow to deep, from simple to complex, there is no shortcut to technology!
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2.54mm Wire To Board Connectors
2.54mm Wire To Board Connectors are avialable in different terminations and sizes intended for use on a variety of applications. These connectors provide power and signal with different body styles, termination options, and centerlines. To find the wire to board set required, click on the appropriate sub section below.
2.54mm(.098") Wire to Board Connector
Provide a variety of PIN and Size, Right Angle or Straight Type, DIP or SMT, Dual or Single Row Wire to Board Connector for industry-specific LCD screen, Communications products, Computer peripheral notebook computer micro-electrical equipment, communications equipment, lighting products, there are a widely range of uses can be use
2.54mm(.098") Wire to Board Connector Specification
Current rating:3A AC DC
Voltage rating:250V AC DC
Temperature rating:-25°C~+105°C
Contact resistance:20mΩ max.
Insulation resistance:1000MΩ min.
Withstanding voltage:1000V AC/min.
Circuits available ::02-18PIN
Contact : :Brass or Phosphor bronze
Electronic rating ::250V/3A
Finish ::Plating Tin or Gold over Nickel
Material ::Nylon UL 94V-0 or UL 94V-2
180° HEADER
90° HEADER
2.54mm(.098") Wire to Board Connector Key Features
2.54MM wire to wire and wire to board connector.
Single Row 180° DIP / 90°DIP / 180° SMT / 90° SMT
Applicable wire AWG #28~ #24
Alternative with Molex products
Lead-Free ROHS & REACH
2.54mm(.098") Wire to Board Connector Applications
Automotive, Communications & Networking, Consumer Electronics, Lighting, Medical
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