German SCHMERSAL plug SCHMERSAL model SCHMERSAL price

SCHMERSAL plug is an industrial data bus that has developed rapidly in recent years. It mainly addresses digital communication between intelligent instruments, controllers, actuators and other field devices 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, processing and manufacturing, transportation, national defense, aerospace, agriculture, and buildings.

SCHMERSAL plug introduction

Fieldbus is an open interconnected network that can interconnect with networks at the same layer or different layers, and can also achieve shared access to network databases. Fieldbus embodies the characteristics of distribution, openness, interconnection, and high reliability, which are precisely the shortcomings of DCS systems. DCS typically transmits signals one-to-one; the analog signals used have low precision and are susceptible to interference. Operators in the control room often find it difficult to adjust parameters and predict faults with analog instruments, leaving them in an "out of control" state. Many instrument manufacturers define their own standards, resulting in poor interchangeability. Instrument functions are relatively single-purpose and struggle to meet modern requirements. Furthermore, almost all control functions are located in the control station. In contrast, FCS adopts one-to-many bidirectional signal transmission. The digital signals used offer high precision and strong reliability. Equipment remains under remote monitoring and in a controllable state by operators at all times. Users can freely choose equipment from different brands and types for interconnection based on needs. Intelligent instruments possess rich functions such as communication, control, and computation, and control functions are distributed among various intelligent instruments. Thus, we can see the tremendous progress of FCS compared to DCS. It is precisely due to the above characteristics of FCS that it offers significant advantages from design and installation to commissioning and normal production: Firstly, since intelligent devices at the front end can perform relatively complex tasks, separate controllers and computing units are no longer needed, saving on hardware investment and footprint; FCS wiring is relatively simple, and a single transmission line can connect multiple devices, greatly reducing installation costs; since field control devices often have self-diagnostic capabilities and can send fault information to the control room, maintenance workload is reduced; meanwhile, users have a high degree of autonomy in system integration and can flexibly select suitable products from manufacturers; the overall system reliability and accuracy are also significantly improved. All this helps users reduce installation, usage, and maintenance costs, ultimately achieving the goal of increasing profits.

SCHMERSAL plug classification

1) By shape: circular electrical connectors, rectangular electrical connectors. Circular electrical connectors are used most extensively in military equipment (aviation, aerospace) due to the characteristics of their structure. Rectangular electrical connectors are more commonly used on printed circuit boards of electronic devices due to their simple structure. 2) By structure: By connection method: threaded connection, bayonet (quick) connection, latch connection, push-pull connection, direct plug-in connection, etc.; By contact termination form: crimping, soldering, wire wrapping; screw (cap) fixation; By environmental protection: environmentally resistant electrical connectors and general-purpose electrical connectors. 3) By application: RF electrical connectors, sealed electrical connectors (glass seal welding), high-temperature electrical connectors, automatic disconnect/separation electrical connectors, filter electrical connectors, composite material electrical connectors, airport power supply electrical connectors, printed circuit board electrical connectors, etc.

SCHMERSAL plug troubleshooting

During electrical assembly, it is often found that individual core crimped wires are not fully inserted, or cannot be locked after insertion, resulting in unreliable contact. Analysis indicates that burrs or dirt in the threads of individual mounting holes cause jamming. This is particularly common in the last few mounting holes of a plug/socket already assembled by the user. Upon discovering this defect, the crimped wires in the other already installed holes must be removed one by one, and the plug/socket replaced. Additionally, improper matching between wire diameter and crimp hole size, or errors in the crimping process, can lead to insecure crimped ends. Therefore, manufacturers must perform a pass-through test on all mounting holes of sample plugs/sockets before shipment. This involves using loading/unloading tools to simulate inserting wires crimped with pins or sockets to check if they can be locked. According to product technical specifications, pull-out force tests are conducted 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. Finding measures to prevent failure and achieving the transformation from failure to reliability is the ultimate goal of failure analysis.

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