Product details

A RP repeater is a connected device that works at the physical layer. It is applicable to the interconnection of two identical networks, and its main function is to expand the network transmission distance by resending or forwarding data signals. A repeater is a network device that regenerates and restores signals: a physical layer device of the OSI model.

The repeater is used to extend the network distance in the local area network environment, but it belongs to the network interconnection device, operating in the OSI physical layer, the repeater has the function of amplifying and regenerating the signal on the line, and is used to extend the length of the LAN network segment (only used to connect the same LAN network segment).

RP repeater (RP repeater) is a device that connects a network line and is often used for bidirectional forwarding of physical signals between two network nodes. The repeater mainly completes the function of the physical layer, is responsible for transmitting information on the physical layer of two nodes by bit, and completes the function of copying, adjusting and amplifying the signal, so as to extend the length of the network. Due to the loss, the signal power transmitted on the line will gradually decay, and when the attenuation is to a certain extent, the signal will be distorted, so it will lead to reception errors. The repeater is designed to solve this problem. It completes the connection of physical lines, amplifies the attenuated signal, and maintains the same data as the original. Under normal circumstances, the two ends of the repeater are connected to the same media, but some Repeaters can also complete the transfer of different media. Theoretically, the use of Repeaters is unlimited, and the network can therefore be extended indefinitely. In fact, this is not possible, because the delay range of the signal is specified in the network standard, and the repeater can only work effectively within the prescribed range, otherwise it will cause network failure.

PLC and DCS system in common

①DCS: Distributed control systems (distributedcontrol systems).

PLC: Programmable Logic Controller (PLC). Both have different emphasis and are advanced.

②DCS focuses more on the process control field (such as chemical, smelting, pharmaceutical, etc.) is mainly the monitoring and adjustment control of some field parameters, while PLC focuses on logic control (machining class). Of course, the current PLC can also deal with process control problems well, but there is no DCS professional.

(3) If the simulation quantity is greater than 100 points, DCS is generally used; If the analog quantity is within 100 points, PLC is generally used.

DCS is a "distributed control system", and PLC is just a control "device", the two are the difference between "system" and "device". The system can realize the functions and coordination of any device, and the PLC device only realizes the functions of this unit.

The DCS network is the central nervous system of the whole system, DCS system usually uses the international standard protocol TCP/IP. It is a safe and reliable double redundancy high-speed communication network, the system is more extensible and open. Because the PLC basically works for a single small system, when communicating with other PLC or host computer, the network form used is basically a single network structure, and the network protocol is often inconsistent with international standards.

All I/O modules of DCS system are equipped with CPU, which can realize the acquisition and output signal quality judgment and scalar transformation, fault charging, random replacement. The PLC module is just a simple electrical converter, there is no intelligent chip, and the corresponding unit is all paralyzed after the failure.

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