German FISCHER plug FISCHER model FISCHER price

FISCHER plug is an industrial data bus that has developed rapidly in recent years. It mainly addresses digital communication between field devices such as intelligent instruments, controllers, and actuators on the industrial site, as well as information transfer between these field control devices and advanced control systems. Due to a series of prominent advantages such as simplicity, reliability, and cost-effectiveness, fieldbus has received significant attention from many standards organizations and computer manufacturers. It is an industrial data bus and serves as the underlying data communication network in the field of automation. The emergence of fieldbus plays a very important role in industrial development and has a significant impact on national economic growth. Fieldbus is mainly applied in fields such as petroleum, chemical industry, electric power, pharmaceuticals, metallurgy, manufacturing, transportation, national defense, aerospace, agriculture, and buildings.

FISCHER plug introduction

Any microprocessor must be connected to a certain number of components and peripheral devices. However, if each component and every type of peripheral device were directly connected to the CPU using separate sets of lines, the wiring would become intricate and complex, making implementation difficult or even unfeasible. To simplify hardware circuit design and system architecture, a single set of lines, equipped with appropriate interface circuits, is commonly used to connect various components and peripheral devices. This shared set of connection lines is called a bus. Adopting a bus structure facilitates the expansion of components and devices; especially when unified bus standards are established, interconnection between different devices becomes easier. In microcomputers, buses generally include internal buses, system buses, and external buses. The internal bus connects peripheral chips within the microcomputer to the processor for chip-level interconnection. The system bus connects plug-in boards to the system board in the microcomputer for board-level interconnection. The external bus connects the microcomputer to external devices. As a device, the microcomputer exchanges information and data with other devices through this bus, which is used for device-level interconnection. Additionally, broadly speaking, computer communication methods can be divided into parallel communication and serial communication, with the corresponding communication buses referred to as parallel buses and serial buses. Parallel communication offers high speed and good real-time performance, but due to the large number of signal lines required, it is not suitable for miniaturized products. Although serial communication has a lower rate, it is simpler, more convenient, and more flexible in microprocessor circuits where data communication throughput is not very high. Serial communication is generally classified into asynchronous mode and synchronous mode. With the development of microelectronics and computer technology, bus technology continues to evolve and improve, resulting in a wide variety of computer bus technologies, each with its own characteristics.

FISCHER plug advantages

1) The dual-bus structure oriented toward memory has higher information transmission efficiency, which is its main advantage. However, conflicts still occur when the CPU and I/O interfaces both access memory. 2) The CPU connects to high-speed local memory and local I/O interfaces via a high-transmission-rate local bus, while slower global memory and global I/O interfaces connect to a slower global bus. This balances high-speed and slow-speed devices, preventing them from interfering with each other. 3) Simplifies hardware design. It facilitates the use of modular structure design methods. Microcomputer designs oriented toward the bus only need to manufacture cpu plug-ins, memory plug-ins, and I/O plug-ins according to these regulations. Connecting them to the bus allows them to operate without considering the detailed operations of the bus. 4) Simplifies system structure. The entire system structure is clear. There are fewer connections, and backplane wiring can be printed. 5) Good system expandability. First, scale expansion merely requires inserting more plug-ins of the same type. Second, function expansion merely requires designing new plug-ins according to bus standards. The position where plug-ins are inserted into the machine often has no strict limitations. 6) Good system update performance. Because cpu, memory, I/O interfaces, etc., are connected to the bus according to bus protocols, as long as the bus design is appropriate, new plug-ins can be designed at any time following advances in processor chips and other related chips. Inserting new plug-ins into the backplane updates the system, and other plug-ins and backplane wiring generally do not need to be changed. 7) Facilitates fault diagnosis and maintenance. Using a motherboard test card makes it easy to locate faulty parts and identify the bus type.

FISCHER plug troubleshooting

During electrical assembly, it is often found that individual core crimped wires are not sent into place, or cannot be locked after being sent into place, resulting in unreliable contact. Analysis shows that the cause is burrs or dirt jamming the threads of individual mounting holes. This is particularly common in the last few mounting holes of a connector housing already assembled by the user. Upon discovering this defect, all previously crimped wires in other holes must be removed one by one, and the connector housing replaced. Furthermore, improper matching of wire diameter to crimp hole size, or errors in the crimping process, can lead to insecure crimped ends. Therefore, before shipment, manufacturers must perform a pass-through test on all mounting holes of sample plugs (sockets) to be delivered. This involves using loading and unloading tools to simulate sending wires with crimped pins or sockets into place to check if they can be locked. According to product technical specifications, pull-out force checks are performed on each crimped wire. Without reliable terminal blocks, there is no reliable system engineering. Failure and reliability are two aspects of a contradictory entity that correspond to and interact with each other. Through reliability screening of terminal blocks, various failure modes and mechanisms are identified, yielding extensive lessons learned and eliminating various hidden dangers. This provides a scientific basis for improving design, processes, inspection, and usage, and is also an important basis for revising and establishing technical conditions for terminal blocks. The ultimate goal of failure analysis is to find measures to prevent failure and achieve the transformation from failure to reliability.

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