216BM61b HESG448267R1021 Module bus connection cable

Product details:

PROFIBUS is an open digital communication system with a wide range of applications, which is a major breakthrough in the transfer of centralized automation system to decentralized automation system.

Since PROFIBUS has been focusing on system integration and system engineering, especially on the research and development of application rules, it has the characteristics of being suitable for fast, time-demanding applications and complex communication tasks, becoming the only field bus that can fully cover factory automation and process automation applications. Especially applicable to the field of factory automation and process automation. Therefore, PROFIBUS has been the leader in the field of fieldbus technology in the international market since its birth.

Along with PROFIBUS a large number of applications, many users began to contact and use fieldbus. However, due to the user’s different understanding of fieldbus technology, coupled with the complex site construction, it is likely to lead to many projects on the fieldbus communication may exist some hidden dangers, if not timely discovery and processing, it may lead to the system communication failure, thus affecting the normal operation of the whole system.

The essence of PROFIBUS network communication is RS485 serial port communication. According to different industry applications, there are three main communication rules: DP (Decentralized Peripherals), FMS (Field Message Specification) and PA (Process Automation).

First, the correct connection method of PROFIBUS-DP line is popularized

The correct connection is as follows, without explanation, just look at the picture. PROFIBUS cable is very simple, just two wires inside, a red one and a green one, and then there is a shield on the outside. When wiring, the shielding layer should be connected, and can not be in contact with the wire inside. To separate the line into and out are which, if it is a string, is a bus down, in the middle of continuous access to the sub-station, this is a very commonly used method. The two connectors at both ends of the bus should be connected to the in hole, not the out hole. Then the switch of the two connectors at both ends should be set to the ON state. At this time, only the in connection is connected, while the out connection is broken. The rest of the middle of the joint, are set to OFF, their access to the two wiring is through (memory method: ON means the access terminal resistance, so both ends of the joint dial to ON; OFF means to disconnect the terminal resistance, so the middle connector should be turned OFF).