GE distribution board DS200TCPDG2BEC serial port measurement module

Description

The power distribution module (TCPD) distributes 125 V DC power to the TCPS board in each I/O core. The TCPD board provides a switch for individually turning off each kernel power supply. Digital I/O cores, from which these cores obtain energy. The 120/240 V AC power for the ignition transformer is provided by the TCPD board.

TUR model: IS200TTURH1B
Professional model: IS200TPROH1B
User model: IS200TSVOH1B
Thermocouple terminal model: IS200TBTCH1C
REL model: IS200TRLYH1B
VIB model: IS200TVIBH2B
Trip original type number: IS200TRPGH1B
Emergency trip type NO: IS200TREGH1B
Module AC to DC, GE part number: DS2020DACAG2.
AC distribution board. GE part number: IS200JPDBG1A.
Power distribution module general electrical part number DS200TCPDG2BEC
DC distribution board. GE part number: IS200JPDDG1A.
125VDC distribution board. GE part number; IS200JPDFG1A

By comparing the historical evolution, technical characteristics, and applicable fields of DCS and PLC, the characteristics and development laws of DCS and PLC technology are explained. Keywords: DCS; PLC; In the field of thermal automation in thermal power plants, DCS and PLC are two completely different and closely related concepts. DCS and PLC are both products of the combination of computer technology and industrial control technology. The main control system of thermal power plants uses DCS, while PLC is mainly used in auxiliary workshops of power plants.

Both DCS and PLC have operator stations that provide human-machine interaction, rely on computer-based controllers to complete control calculations, exchange data with primary components and execution devices through I/O cards, and have communication systems called networks. Why do DCS and PLC have completely different concepts when they are so similar? How do we choose in engineering practice? This article provides a review from several aspects such as historical evolution, technical characteristics, and development direction, hoping to provide reference for thermal engineering professionals. Taking the NT6000 of Keyuan as an example, we strive to provide detailed and clear examples of the DCS situation.

The historical evolution and core concept of DCS and PLC. DCS is the English abbreviation for Total Distributed Control System. It refers to the dispersion of hazards and the concentration of data. In the mid-1970s, it entered the market and completed analog quantity control, replacing analog control instruments mainly based on PID calculation. The idea of DCS was first proposed by instrument manufacturers, which were mainly applied in the chemical industry at that time. And PLC was successfully developed in the late 1960s, known as the Programmable Logic Controller for logic operations, abbreviated as PLC. Mainly used in the automotive manufacturing industry. The design principles of DCS and PLC differ greatly. PLC developed from imitating the original relay control principle, and in the 1970s, PLC only had switch logic control.

It stores instructions for performing logical operations, sequential control, timing, counting, and operations; And control various machinery or production processes through digital input and output operations. The control program developed by the user expresses the process requirements of the production process. Store it in the user program memory of the PLC and execute it item by item according to the stored program content during operation to complete the operations required by the process flow. DCS was developed on the basis of operational amplifiers. Design all functions and the relationships between process variables into functional blocks.
In the mid-1970s, DCS only had analog control. The main difference between DCS and PLC controllers is in the calculation of switching and analog quantities, even though the two have some mutual penetration later on, there are still differences. After the 1980s, in addition to logical operations, PLC also added some control circuit algorithms, but it was still difficult to complete some complex operations. PLC used ladder diagram programming, and analog operations were not very intuitive during programming, making programming more cumbersome. But in terms of solving logic, it exhibits the advantage of being fast. DCS, on the other hand, uses functional blocks to encapsulate analog and logical operations, and the expression of both logical and complex analog operations is very clear. However, compared to PLC, the expression efficiency of logical operations is relatively low.

The historical differences between DCS and PLC are significant and have had a significant impact on their subsequent development. However, the biggest impact on subsequent development is not the difference in origin technology, but rather the difference in its concept of origin. The core concept of DCS is a computer control system with dispersed hazards and centralized data. Therefore, the development process of DCS is to continuously utilize the latest achievements of computer technology, communication technology, and control technology to build a complete distributed control system. DCS provides users with a complete, safe, reliable, efficient, and flexible solution for industrial control. The core concept of PLC is a programmable controller, which is used to replace relays, perform sequential control functions such as logic, timing, and counting, and establish flexible program control devices. So, the main line of PLC’s continuous development is to continuously improve various capability indicators and provide users with a complete and flexible control device. DCS is a system, while PLC is a device, which is the fundamental difference in concept between the two. The impact of this difference is profound, as it permeates every aspect of the technological economy.