ESP10B GE Frame Import Module


Model: ESP10B
Manufacturer: GE
Voltage range: 24VDC
Operating temperature range: -30 ° C to+90 ° C
Input current: 15mA
Output current: 2A
Protection level: IP20

Category: SKU: ESP10B Tag:
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ESP10B GE Frame Import Module

ESP10B GE Frame Import Module


Comparison of typical systems
By using a fieldbus, users can significantly reduce field wiring, achieve multivariable communication with a single field instrument, and fully interoperate between devices produced by different manufacturers, adding on-site control functions, greatly simplifying system integration, and making maintenance very easy. A typical fieldbus system diagram is shown in Figure 1. From Figure 1, it can be seen that in traditional process control instrument systems, each field device needs to use a dedicated pair of twisted pairs to transmit 4-20mA signals to the control room. In the field bus system shown in Figure 2, the twisted pair from each field device to the junction box can still be used, but only one twisted pair is used for digital communication from the field junction box to the central control room.
The author has not yet calculated how much cable can be saved by using a fieldbus control system. However, we cannot use the kilometers of cables used in power plants with DCS systems related to automatic control systems to determine the proportion of cables in infrastructure investment.

A certain power plant, 2 × 300MW coal-fired unit. The thermal system is a unit system. Each unit is equipped with a centralized control building, which adopts the centralized control method of machine, furnace, and electrical units. The elevation of the unit control room is 12.6 meters, which is consistent with the elevation of the operating floor. DCS adopts WDPF-II, and each unit is designed with 4500 I/O points.
The cable laying adopts EC software, and 8 people complete the design task of cable laying in 1.5 months; The number of cables for the automation discipline of each 300MW unit in the main factory building is 4038; The cable length for the automation discipline of each 300MW unit in the main factory building is 350 kilometers; The number and length of the above cables do not include the factory supplied cables for fire alarms in the entire factory and the cables for auxiliary production workshops in the entire factory; The columns, trays, and small trough boxes of the cable tray are all made of steel galvanized, with each unit weighing approximately 95 tons. Other cable trays, including straight, curved, three-way, four-way, cover plate, terminal head, width adjustment piece, and direct piece, are made of aluminum alloy material, with each 300MW unit weighing approximately 55 tons. Accessories are provided with the bridge (such as bolts and nuts).

A certain power plant, 4 × MW fuel and gas power plant. The thermal system is a unit system. DCS adopts TELEPERM-XP. Each unit is designed with 5804 I/O points.

The cable laying adopts EC software, and 12 people complete the design task of cable laying in 2.5 months; The number of cables for the automation discipline of each 325MW unit in the main factory building is 4413; The cable length for the automation discipline of each 235MW unit in the main factory building is 360 kilometers; Each unit is equipped with steel galvanized cable trays, which weigh approximately 200 tons. The cables of power stations can be divided into six categories: high-voltage power cables, low-voltage power cables, control cables, thermal control cables, weak current cables (mainly referring to computer cables), and other cables. If two 300MW units are simultaneously laid with cables, the number of automation cables is approximately 8500. Among them, there will be more than 5000 thermal control cables and weak current cables, accounting for about 60% (measured by the number of cables).

 Design, Investment, and Use
The above comparison focuses on purely technical aspects, and the following comparison intends to incorporate economic factors.
The prerequisite for comparison is to compare the DCS system with a typical and ideal FCS system. Why make such assumptions. As a DCS system, the technical requirements proposed in the early stages of development have been met and improved to this day. The current situation is further improved, so there is no typical or ideal statement. As an FCS system, it has just entered practicality in the 1990s. As a technical requirement in the early development stage, it is compatible and open, bidirectional digital communication, digital intelligent field devices, high-speed buses, etc., which are currently not ideal and need to be improved. This state cannot be said to be unrelated to the formulation of international standards for fieldbus. In the past decade or so, various bus organizations have been busy formulating standards, developing products, and occupying more markets, with the aim of squeezing into international standards and legally occupying a larger market. The battle over international standards has come to an end, and major companies and organizations have realized that in order to truly capture the market, they need to improve their systems and related products. We can make a prediction that in the near future, a complete fieldbus system and related products must become the mainstream of fieldbus technology in the world.

Specific comparison:
(1) The DCS system is a large system, and its controller has strong functions and plays a very important role in the system. The data highway is the key to the system, so the overall investment must be made in one step, and subsequent expansion is difficult. However, the decentralization of FCS functions is relatively thorough, information processing is on-site, and the widespread adoption of digital intelligent on-site devices weakens the function and importance of the controller. Therefore, the investment starting point of the FCS system is low, and it can be used, expanded, and put into operation simultaneously.

(2) The DCS system is a closed system, and the products of various companies are basically incompatible. The FCS system is an open system, where users can choose various devices from different manufacturers and brands to connect to the fieldbus, achieving the best system integration.

(3) The information of the DCS system is all formed by binary or analog signals, and there must be D/A and A/D conversion. The FCS system is fully digital, eliminating the need for D/A and A/D transformations, with high integration and performance, enabling accuracy to increase from ± 0.5% to ± 0.1%.

(4) The FCS system can incorporate PID closed-loop control functions into transmitters or actuators, shortening the control cycle. Currently, it can increase from 2-5 times per second in DCS to 10-20 times per second in FCS, thereby improving regulation performance.

(5) DCS can control and monitor the entire process of the process, diagnose, maintain, and configure itself. However, due to its own fatal weakness, its I/O signals use traditional analog signals, making it impossible to remotely diagnose, maintain, and configure on-site instruments (including transmitters, actuators, etc.) on the DCS engineer station. FCS adopts fully digital technology, and digital intelligent field devices send multivariate information, not only single variable information, but also have the function of detecting information errors. FCS adopts a bidirectional digital communication fieldbus signaling system. Therefore, it can remotely diagnose, maintain, and configure on-site devices (including transmitters, actuators, etc.). The superiority of FCS is incomparable to DCS.

(6) Due to the fieldization of information processing, FCS can save a considerable number of isolators, terminal cabinets, I/O terminals, I/O cards, I/O files, and I/O cabinets compared to DCS. At the same time, it also saves space and floor space for I/O devices and device rooms. Some experts believe that 60% can be saved.

(7) For the same reason as (6), FCS can reduce a large number of cables and cable trays used for cable laying, while also saving design, installation, and maintenance costs. Some experts believe that it can save 66%. For points (6) and (7), it should be noted that the effectiveness of using FCS systems in saving investment is beyond doubt, but is it possible that it can reach 60-66%, as some experts suggest. These numbers have appeared in multiple articles, and the editor believes that they are the result of mutual transfer. The original source of these numbers has not yet been found, so readers should be cautious when quoting these numbers.

(8) Compared to DCS, FCS has a simple configuration and is easy to install, operate, and maintain due to standardized structure and performance.

(9) Key points of FCS design and development for process control. This point is not intended as a comparison with DCS, but rather to illustrate the key issues that should be considered in the design and development of FCS for process control or simulation of continuous process classes. 1) The intrinsic safety explosion-proof function of the bus is required, and it is of paramount importance. 2) The changes in basic monitoring such as flow rate, material level, temperature, pressure, etc. are slow and have hysteresis effects. Therefore, node monitoring does not require fast electronic response time, but requires complex analog processing capabilities. This physical characteristic determines that the system generally adopts a centralized polling system between master and slave, which is technically reasonable and economically advantageous. 3) The physical principles of measuring parameters such as flow rate, material level, temperature, and pressure are classical, but sensors, transmitters, and controllers should develop towards digital intelligence. 4) As an FCS developed for continuous process and its instrumentation, it should focus on improving the design of the low speed bus H1.

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