German ABB plug, ABB model, ABB price

ABB plug refers to the interface between the central processing unit and the standard communication subsystem. For example: RS232 interface. The RS232 interface is a serial port. Data transmission between computers or between a computer and a terminal can use either serial communication or parallel communication. Serial communication is widely adopted because it uses fewer lines, has lower costs, and avoids inconsistencies in line characteristics, especially during long-distance transmission. In serial communication, both communicating parties are required to use a standard interface so that different devices can be easily connected for communication. The RS-232-C interface (also known as EIA RS-232-C) is the most commonly used serial communication interface. It was established in 1970 by the Electronic Industries Alliance (EIA), together with the Bell System, modem manufacturers, and computer terminal manufacturers, as a standard for serial communication. Its full name is "Technical Standard for Serial Binary Data Exchange Interface between Data Terminal Equipment (DTE) and Data Communication Equipment (DCE)." This standard specifies the use of a 25-pin DB25 connector, defines the signal content for each pin of the connector, and specifies the voltage levels for various signals.

ABB Plug Introduction

As automation technology has evolved from standalone machine control to Factory Automation FA and then to system automation, the factory automation information network can be divided into the following three-tier structure: factory management level, workshop monitoring level, and field device level. The fieldbus is the communication network between devices at the factory bottom layer. Here we first introduce Ethernet, specifically Industrial Ethernet. Industrial Ethernet is an industrial network protocol derived from the office automation domain. By convention, it mainly refers to the IEEE 802.3 protocol. If the TCP/IP protocol suite is further adopted, it is expressed as "Ethernet + TCP/IP". Its technical characteristics are mainly suitable for information management and information processing systems, and it has achieved great success in the IT industry. In the field of information integration at the factory management level and workshop monitoring level, Industrial Ethernet has many successful cases, and there are also many applications at the device layer where real-time performance is not strictly required. Due to the wide variety of fieldbuses and inconsistent standards, many people hope that Ethernet technology can intervene at the lower device layer and widely replace existing fieldbus technologies. Schneider Electric is an active advocate and practitioner of this idea, with a range of industrial-grade products released and put into practical application. However, Ethernet cannot truly solve real-time and determinism issues, so most field layers will still prefer fieldbus technology. Due to technological limitations and conflicts of interest among manufacturers, the current situation of coexistence of various industrial bus technologies and continuous penetration of Ethernet technology will persist for some time. Users can choose the required solution based on technical requirements and actual conditions.

ABB Plug Types

1) 232-C is a serial physical interface standard developed by the Electronic Industries Alliance (EIA) (Electronic Industry Association). RS is the abbreviation for "Recommended Standard" in English, 232 is the identification number, and C indicates the revision number. The RS-232-C bus standard has 25 signal lines, including a main channel and an auxiliary channel. In most cases, the main channel is primarily used. For general duplex communication, only a few signal lines are needed, such as one transmit line, one receive line, and one ground line. The RS-232-C standard specifies that the driver allows a capacitive load of 2500pF. The communication distance is limited by this capacitance. For example, when using a communication cable with 150pF/m, the maximum communication distance is 15m; if the capacitance per meter of cable decreases, the communication distance can increase. Another reason for the short transmission distance is that RS-232 uses single-ended signal transmission, which suffers from common-ground noise and an inability to suppress common-mode interference. Therefore, it is generally used for communication within 20m. 2) RS-485 bus: When the required communication distance ranges from tens of meters to over a kilometer, the RS-485 serial bus standard is widely adopted. RS-485 uses balanced transmission and differential reception, thus having the ability to suppress common-mode interference. Additionally, the bus transceiver has high sensitivity and can detect voltages as low as 200mV, allowing the transmission signal to be recovered over distances beyond a kilometer. RS-485 operates in half-duplex mode, meaning only one point can be in the transmitting state at any time. Therefore, the transmitting circuit must be controlled by an enable signal. RS-485 is very convenient for multi-point interconnection, saving many signal lines. Applying RS-485 allows networking to form a distributed system, permitting up to 32 drivers and 32 receivers to be connected in parallel.

ABB Plug Selection Factors

Communication between PC and intelligent devices mostly relies on RS232, RS485, Ethernet, and other methods, depending mainly on the device's interface specifications. However, RS232 and RS485 only represent the physical media layer and data link layer of communication. To achieve bidirectional data access, one must write custom communication applications. However, most of these programs do not comply with ISO/OSI specifications, can only implement relatively simple functions, are suitable for a single device type, and lack universality. In a device network formed by RS232 or RS485 devices, if the number of devices exceeds 2, RS485 must be used as the communication medium. Information exchange between devices in an RS485 network can only be achieved through relay by a "Master (Master)" device. This master device is usually the PC, and only one master device is allowed in such a device network, with all others being Slave (Slave) devices. Fieldbus technology is based on the ISO/OSI model, has a complete software support system, and can resolve issues such as bus control, collision detection, and link maintenance.

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