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The Bently Nevada 3500/92 136188-02 is a communication gateway module developed for the 3500 series machinery protection and condition monitoring system. It supports seamless communication between the monitoring platform and external industrial devices, ensuring stable data transfer and efficient system integration.

The Bently Nevada 3500/92 136188-02 is widely used for industrial communication and Modbus connectivity, helping improve monitoring efficiency, operational visibility, and equipment diagnostics in critical applications.

Supports reliable industrial communication

Compatible with Modbus communication protocols

Designed for Bently Nevada 3500 systems

Stable and dependable performance

Enhances equipment diagnostics and system integration

Power generation plants

Oil & gas industry

Petrochemical facilities

Industrial machinery monitoring systems

Process automation applications

Brand Bently Nevada

Model 3500/92

Part Number 136188-02

Product Type Communication Gateway Module

System 3500 Machinery Protection System

Function Data communication & integration

Abstract: With the increasing application of PLC in industrial automatic control systems, the correct selection of PLC is very important. The opinions on PLC selection in automatic control system design are proposed from eight aspects: workload, working environment, communication network, programming, communication with monitoring system, scalability, after-sales service and technical support, cost-effectiveness, etc.

Programmable logic controllers (PLCs) have been increasingly used in industrial control systems and play a very important role in automatic control systems. So, the correct selection of PLC is very important.

Faced with various types of PLCs from numerous manufacturers, each with its own advantages and disadvantages, they can meet the various needs of users. However, they are incompatible in terms of form, composition, function, network, programming, etc., and there is no unified standard for horizontal comparison. Below are some opinions on PLC selection in automatic control system design, which can be used as a reference when selecting PLCs.

By comparing the following aspects, suitable products can be selected.

1、 Workload

This is particularly important. At the beginning of the design of an automatic control system, there should be an accurate calculation of the number of control points (digital and analog), which is often the primary condition for choosing a PLC. Generally, a PLC with 10% to 30% more control points should be selected. There are several considerations to consider:

1. Can make up for the missing points in the design process;

2. Can ensure that there are alternative points in case of individual faults during operation;

3. The need to increase points in the future.

2、 Working environment

The working environment is a hard indicator for PLC operation. The self-control system frees people from busy work and harsh environments, requiring the self-control system to adapt to complex environments such as temperature, humidity, noise, signal shielding, working voltage, etc. Each PLC is different. Be sure to choose products that are suitable for the actual work environment.

3、 Communication Network

Nowadays, PLC is no longer a simple on-site control, and remote communication of PLC has become a problem that must be solved in control systems. However, the communication protocols developed by various manufacturers vary greatly and have poor compatibility. At this point, the following aspects are mainly considered:

1. Communication between products from the same manufacturer. Each manufacturer has its own communication protocol, and there is more than one. This is evident on large and medium-sized computers, but not entirely the same on small and micro computers. Some manufacturers, due to considerations such as capacity, price, and functionality, often do not have or have communication protocols that are different from other protocols and relatively simple. So, in this regard, the main consideration is the communication between different types of PLCs from the same manufacturer;

2. Communication between products from different manufacturers. If the design of the automatic control system involves partial modification of an existing automatic control system, and a PLC different from the original system is selected, or if two or more PLCs are needed in the design and products from different manufacturers are selected, communication issues between products from different manufacturers need to be considered;

3. Is it beneficial for the future. Due to the different communication protocols developed by various manufacturers and the lack of unified standards internationally, PLC selection is greatly limited. We need to consider communication protocols that have a large impact, development potential, complete functionality, and are close to universal.

4、 Programming

The program is the "heart" of the entire automatic control system, and the quality of program development directly affects the operation of the entire automatic control system. Some manufacturers require additional purchases of programmers and programming software, and the prices are expensive, which also needs to be taken into account.

1. Programming methods

One is to use a dedicated programmer provided by the manufacturer. It is also available in various specifications and models. The large programmer has complete functions and is suitable for various types of PLCs, with high prices; Small programmers have a compact structure, are easy to carry, have a low price, but have simple functions and poor applicability; Another approach is to use programming software that relies on personal computer application platforms, which is now adopted by most manufacturers. Due to the differences in their products, manufacturers often only develop programming software that is suitable for their own products, and the style, interface, application platform, flexibility, adaptability, and ease of programming of programming software can only be given a price after the user personally operates it.

2. Programming language

Programming languages are the most complex and diverse, seemingly the same but not universal. The most commonly used programming languages can be divided into the following 5 categories:

(1) Ladder diagram

This is the programming language most commonly used by PLC manufacturers, originally evolved from relay control diagrams. It is relatively simple and most useful for discrete control and interlock logic;

(2) Sequential Function Diagram

It provides the overall structure and coordinates with state localization processing or machine control applications;

(3) Function Block Diagram

It provides an effective development environment and is particularly suitable for process control applications;

(4) Structured Text

This is a programming language similar to that used for computers, suitable for complex algorithms and data processing;

(5) Instruction table

It provides an environment for optimizing coding performance, which is very similar to assembly language.

The programming software provided by manufacturers generally includes one or several programming languages. For example, TE's XTEL programming software can use three programming languages: Ladder, Grafcet, and Literal; Siemens' Step7 programming software can use two programming languages: Ladder and STL; Modicon's Modsoft programming software only uses one programming language, ladder diagram (984 ladder), while another Concept programming software can use five programming languages, namely ladder diagram (LD), sequential function diagram (SFC), function block diagram (FBD), structured text (ST), and instruction list (IL). Most programming languages under the same software can be interchanged, so it is generally recommended to choose a programming language that you are familiar with.

3. Memory storage

PLC memory is a place where programs and data are stored, available in both internal and external formats. The memory capacity ranges from 512 to 128MB, and it is important to select a sufficiently large memory based on the actual situation, with some spare space required for caching. [!--empirenews.page--]

PLC memory can be classified into random access memory (RAM), read-only memory (ROM), erasable read-only memory (EPROM), etc. according to their types. RAM can be read and written freely, and the program can only be maintained for a certain period of time after power failure, making it most suitable for use in debugging automatic control systems. ROM can only be read and cannot be written. The program is pre fixed by the manufacturer or developer and cannot be changed. Even if it loses power, it will not be lost. EPROM and ROM are only EPROMs that can be erased and rewritten through special methods (such as ultraviolet light), making them suitable for use in systems that work for a long time without significant modifications.

4. Easy to change

Another advantage of PLC over relay control is that it can arbitrarily change the control structure (or control process) according to actual needs, which requires convenient and fast program modification.

5. Is there a dedicated module available

Some manufacturers provide dedicated modules for their PLC products, such as communication modules, PID control modules, counter modules, analog input/output modules, etc. Corresponding program blocks are also provided in the software, which can often be easily implemented by simply inputting some parameters, making it convenient for users to program.

5、 Communication with the monitoring system

1. Human computer dialogue console. This is an early product type of monitoring system, designed by manufacturers specifically for their PLC products, and is most suitable for point-to-point control. Simple structure, few functions, panel control, easy operation, still widely used in on-site control systems. Its advantage is that it can still effectively control the site even when remote control fails.

2. With the continuous development of computers, monitoring systems relying on PCs (including industrial control computers) are increasingly being applied in self-control systems. This type of monitoring system is tailor-made by PLC developers for their own (or specific) products; Another type is a monitoring system developed by software development companies that is suitable for most PLC products. The former has strong compatibility with PLC products and can develop corresponding control plans based on the characteristics of PLC products, which should be said to still be centered around PLC; The latter type abandons PLC products and focuses on the advantages of computers in image, animation, sound, network, data, and other aspects, providing more relaxed development conditions for secondary developers. Often, excellent monitoring systems can be produced as long as there is a corresponding communication protocol (currently the communication protocol of most manufacturers), which can be connected to various types of PLCs, making it the preferred choice for today's automatic control systems. So, in this regard, the feasibility of the communication method between the selected PLC and the monitoring system should be considered.

6、 Ductility

This includes three aspects of meaning:

1. Product lifespan. Roughly guarantee the service life of the selected PLC and try to purchase products with a production date as close as possible;

2. Product continuity. Whether the continuous development and upgrading of PLC products by manufacturers are backward compatible determines whether it is beneficial for the application of new functions in the current system in the future;

3. The update cycle of the product. Can the manufacturer guarantee sufficient spare parts (or components) when a certain model of PLC (or PLC module) is eliminated. At this point, one should consider choosing a relatively new PLC at the time.

7、 After sales service and technical support

1. Choose good company products;

2. Choose a reputable agent;

3. Do you have strong after-sales service and technical support.

8、 Cost effectiveness ratio

The performance of the self-control system takes priority over the choice of price. Only when the first few items are relatively close and difficult to choose, consider the price factor and choose products with higher cost-effectiveness.

In the actual selection process, there are often various constraints, and it is not necessary to consider all of the above aspects, but some of them must be considered, and the existing problems must also be solved through other alternative methods.

Generally speaking, by comparing the first 5 items, 2-3 products can be identified, and then considering the latter few items, the PLC that is more satisfactory can be selected. With the continuous development of science and technology, PLC products will also have a unified standard. At that time, selecting a PLC will no longer be a difficult task.

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