Product details

Technical information :

• Long Description:
• DSTC 120 Connection Unit for Asynchronous
  Communication Interface
  See mounting screws kit: 3BSE021202R1

• Product Type:
• Module_Termination_Unit
• Product Net Depth / Length:
• 200 mm
  
• Product Net Height:
• 80 mm
  
• Product Net Width:
• 40 mm
  
• Product Net Weight:
• 0.125 kg

I. Definition of RTURemote terminal: an automation equipment with four remote functions installed in the substation, box substation and other places in the power dispatching automation system.Telecontrol device = remote terminal = telecontrol terminal =RTUIi. Overview of RTU development1. In the 1960s and 1970s, hardware telematics devices: contactless telematics devices WYZ or digital integrated telematics devices SZY composed of transistors or integrated circuits are wired logic telematics devices, and all functions are realized by logic circuits, which have been basically eliminated.After the 1980s, software telemechanical device: a motion device based on the principle of microcomputer (microcomputer telemechanical device), the function is realized by the software program, with strong function, good scalability, simple structure, stable and reliable.3. Main functions of RTU1. Remote function: The monitoring function completed by remote information transmission between RTU and dispatch center.① Telemetry (YC) : The RTU transmits the collected operating parameters to the dispatch center according to the protocol. Including P, Q, U, I, temperature, etc. In addition, two special YCs are also included:A. Digital value: RTU is directly received and uploaded in the form of a digital quantity.b. Counting pulse: separate acquisition (circuit) board. It mainly refers to the pulse count of the reaction electricity collected by RTU. The capacity can reach tens of circuit measurement.② Remote message (YX) : RTU will collect the running status and transmit it to the dispatching center according to the protocol. Including: circuit breaker and brake position signal, relay protection and automatic device position signal, remote device operating status.③ Remote control (YK) : The command sent by the dispatch center to the RTU to change the operating state of the equipment. Including: operation of voltage levels of circuit breakers, switching SVG, generator start and stop, etc.

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.

ABB series of products