A PLC & SCADA system in the industry is actually used for the machine control development. In architecture, the document explains the SCALA & PLC systems and their process interface hardware, application and functionality development facility offered by them.


With respect to industrial standards there are some attentions required to which they attach their conspired evolution along with potential benefits for their use.

PLC An Overview

A PLC or Programmable Controller is used for the purpose of industrial automation process like machine control on factory assembly lines.

The PLC is made for lots of inputs and arrangements unlike normal computers, immune to electric noise, impact and vibration, large extended temperatures. Machine control operations for programming battery hacked stored or non-volatile memory.

Real time system’s example is PLC since there must be a production in output results in input conditions

A PLC is an example of a real time system since output results must be produced in response to input conditions within a bounded time, otherwise unintended operation will result.

For the purpose of Supervisory Control and Acquisition of industrial process, SCADA is a widely used industry. For the purpose of experimental physics lab ancillary systems are controlled with ancillary systems like ventilation, cooling, power distributions etc.

The functional scalability of the substantial progress with respect to recent years are open, performed, scalable that are alternative to in house development for control systems that are complex and demanding as those in physics experiments.

How to choose a polling mode?

DF1 Half-Duplex Master

There can be a slave station communication configured with master station in either Message-based polling or Standard polling mode. Here are few pros and cons discussed below:

Message-Base Polling Mode

The best message based polling mode in communication networks with slave stations

Message-based polling mode is best used in networks when communication with the slave stations is not time critical and where the user needs to be able to limit when and how often the master station communicates with each slave station.
It is not recommended for larger systems that require time critical communication between the master and all the slave stations, or for systems where slave station-initiated messages are going to be used. Thus our electrical training course is more than enough for you to make your career in this field.




A relative amount of power for operating the relay coil is the benefit of relay but there are various usage of relay in control motors, lamps, heaters, Ac circuits which use a lot of electrical power. For more information join the electrical training course to make your career in this field.

An output device (actuator), electro-mechanical relay arrives in a lot of sizes, shapes, and designs. There are lots of applications, uses in electronic circuits. For reducing the electronic power or computer type circuits, electrical relays are used for switching relatively high voltages or currents for both ON or OFF state controlling, relay switch circuit is required.
The types and design of relay switching circuits is huge, but lots of tiny electronic projects utilizes MOSFETS and transistors. As the transistor can offer rapid DC switching (ON-OFF), it is used as main switching device. Let us see few relays over here.


A coil driven NPN transistor is a typical relay switch circuit relying on the input voltage level. The transistor is disconnected and acts as an open switch when the base voltage of the transistor is zero (or negative). There are no collector current flowing and the current devices causes the coil relay to be de energized and there will not be any current flow through the relay coil if there is no current flow in the base.

In the base if a positive current is drawn for NPN transistor saturation, the B to E current flow controls the larger relay coil passing through the transistor from the Collector to Emitter.

For the famous bipolar switching transistors, the flowing currant’s amount in the relay coil inside the collector between 50 to 800 times and for driving the transistor to saturation, the needed base current is made to flow. The beta value or the current gain of the general purpose BC109 is a 290 mA data sheet.


For switching small loads like LEDs and miniature relays, the ancient NPN transistor relay circuit is very apt. For switching larger relay coils or currents crossing the threshold range of BC109 transistor can be achieved using Darlington Transistors.
The current gain and sensitivity of a relay switch circuit can increase greatly using a pair of transistors of Darlington. Two similarly connected Bipolar transistors can be shown into one device with standard: Emitter, Base, and Collector connecting leads.

The first transistor’s collector current TR1 becomes the base current of the second transistor TR2 because two NPN transistors are connected.

Darlington switching pair configured from two individual transistor have a small value resistor (100 to 1000 ohms) placed between the Emitter and Base of the main switching transistor, TR2 for ensuring the fully OFF turns. A flywheel diode again is used for protecting TR2 from the emf generated back during the relay coil DE-energizing.


The Standard Common Emitter Configuration having a relay coil can be connected to Emitter terminal for forming an Emitter Follower Circuit. There is a direct connection of input signal directly to the base and the output is driven from the Emitter load.


The Darlington transistor version of the ancient emitter follower circuit has TR1, a small positive base current causing a greater collector current to flow via TR2 because of multiplication of the two Beta values.


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Define Electrical Design

Creating, planning, testing, or supervising are entailed by Electrical design and it is for the development and installation of electrical equipment, along with lighting equipment, power distribution, power systems, life safety systems, electronic components, and data and voice communications infrastructure. Usually people who work in this field are electrical engineers with bachelors or masters degree. For more information join the electrical design course to make your career in this field.

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More details of Electrical Design

Electrical design is the design of different electrical systems, to be put in a simple form. From the marketing and sales department, many ideas of electrical design projects are initiated. A new marketable product is represented in the electrical design projects for enhancing an existing product or system.

Career in Electrical Design

It is very complex to pursue electrical projects and therefore at a very initial stage electrical engineers offer from master planning the final product. In electrical design the electrical engineers involved must be competent at a technical level with wide range of engineering and design software packages along with various lab equipments and instruments. For interacting with clients and other professionals like mechanical engineers, software engineers, sales and marketing, support personnel, etc. There is a need for bachelor’s degree in electrical engineering or electronics engineering to make a career in this field.

Factors affecting Electrical Design

There are lots of things to be considered by the design engineers that can influence the final product. There are lots of questions to be addressed before developing the final prototype like:

Usage of the product

Key features of the product

Power Source of the product

Product operation, and environmental condition including, moisture, temperature, humidity and pressure.

Types of Electrical Design Projects

One of the key driving features in electrical design is the technological advances in the global society. Innovation and Design is an continuous program in power generation companies, engineering firms, instrument companies, production, electronics industry, etc. Here are few designs the project engineers will encounter:

  • Electrical Substations

  • Electronic circuit design

  • Robotics

  • Communication equipment

  • Computer and digital circuit design




In olden days for controlling the manufacturing processes relays were used. Because of excessive consumption of power it is difficult to figure out the linked problems with it, therefore it must be regularly replaced. To solve the problems, Programmable Logic Controller was unveiled. For more information join the electrical automation course to make your career in this field.



For the automation of different electro-mechanical processes in industries a digital computer called Programmable Logic Controller (PLC) is used. For surviving during tough times these controllers are specially used and they are protected from cold, heat, dust, and moisture, etc. Computer Language is used for programming the microprocessor existing in the PLC.

It is a computer written program and is PLC down-loadable via cable. In the nonvolatile memory of PLC these loaded programs are stored. For the user fed program the hard wired logic was exchanged during the change from relay control panels to PLC. For controlling and programming the PLC, Ladder Logic, a visual programing language was created.



CPU, Memory, Input/Output, Power Supply Unit, and Programming device are the hardware components of a PLC system.

CPU– For avoiding the errors the PLC controller is checked. Logic Operations, computer interface, arithmetic operations are some of the performed functions.

Memory– CPU uses fixed data. In the operating system the data is permanently stored in the System (ROM). Status of Input and Output devices, values of timers, counters and other external device information are stored in RAM.

I/O section– Sensors, switches are field devices that are tracked by the input section.

O/P Section- Motors, lights, pumps, and solenoids are some of the devices Output has a a control on. Reduced Instruction Set Computer (RISC) is the basis for I/O ports.

Power Supply– An isolated power supply is available in certain PLC. You can find most of the PLCs working at 220VAC or 24VDC.

Programming device– Inside the memory of the processor, the device is used for feeding the program. First the programming device is fed with the program and the later forwarded to the PLC’s memory.

System Buses: The internal digital signal flows through the buses in the PLCS. The four system buses are:

  • For transferring data among different elements, data bus is used by the CPU.
  • With respect to the action that are controlled internally, control bus transfer signals are used.
  • Location’s address is sent using the Address Bus for accessing the data.
  • The I/O port and I/O unit communicates with each other using system bus.

As PLC has been into existence since 50 years there is a very meager need for improvement and thus if you are planning to work with PLC you can consider it as a mature technology. Any equipment has a competitive counterpart with a never ending need of improvement, providing faster, smaller and cheaper solutions.

In the world of industrial automation, the embedded processor of PLC is providing a real-time proprietary operating system is in demand today.

It is anticipated that there will be a need for improvement in hardware, software, and communication to develop with the adapting technology in the future of PLC. Programmable Automation Controller (PAC) and PLC functionality, will be evolved as a part of the evolution.


In the current electronics industry the circuit boards, components, and processors are shrinking. PLC is in need for stability, reliability, and slow acceptance for the improvements in its technology. For added memory capacity, improved cycle time, and new communication features with the help of fast processors are the current enhancements. Most of the higher end PLCs are converting to lower end PLCs with respect to market demands, functions, and features. For instance it can be considered that small PLCs will improve to have lots of features of PLCs with higher-end and mid and high range PLCs have very less to offer, and the user requirements are met with compact solutions.


Lots of industrial controller suppliers show case the difference between PACs and PLC but the nomenclature is not taken care of by the future of automation engineers targeting on performance and the existing features when their system is specified. PACs and PLCs will keep on growing similar to features and definition of each of them is growing and changing.

There will be lots of demand for low and high-end processors during this transformation period. Who knows, the lower-end processors will make their way with advanced features as there is an advancement in hardware technology with passage of time.

For including more features and options pressure will be put on the suppliers for the above reason. The advanced features of motion control, vision system integration, and similar support for multiple communication controls with steady maintenance of the simplicity thereby making PLCs attractive to their customers.



1) Cut, Copy, and Paste a Circuit

1) Do the following things:

Go to Schematic tab and click on Circuit Clipboard panel then cut

Go to Schematic tab and click on Circuit Clipboard panel then copy clip.

2) Select the base point. While pasting the objects the base point becomes the insertion point.

3) Select the components and wires for copying.

Note: Remove the objects and heal the wires after selecting cut.


4) Move to the drawing where you want to paste the objects.

5) Go to schematic tab Circuit clipboard panel and then click on paste.

6)Circuit Scale Dialog box has lots of options to select.

If there are various fixed wire numbers choose to keep them or blank them out.

Blank orphan contact tags must be specified or must be kept unchanged.

If you want to keep source arrows please specify.

7) Click OK.

8) Choose the insertion point.

Copy a circuit within the same Drawing

1) Click Schematic tab and then edit components panel then go to circuit drop-down then go to copy circuit.

2) Components and wires to copy are selected. Carefully look around the circuit and be sure to capture the connection wires and dots.

3) Press Enter.

4) Press S for making a single copy.

5) Choose the base point and then the second point for the copy.

6) Continue selecting location points and press Enter if you wan to make multiple copies.

7) With respect to the objects copied, the dialog box displays of the copy circuit really matters.

If there are fixed wire numbers in the circuit then decide to keep or discard them out.

If there are fixed component tags in the circuit then decide to keep them or re-tag the found tags. Decide to blank orphan contact tags or keep them unchanged.

If the circuit has any terminal numbers, then specify to have them, update them ,or blank them for uniqueness inside the terminal strip.

Move a Circuit

1) Go to Schematic tab then click on edit components panel then go to circuit drop-down then click on Move circuit.

2) Choose the circuit to move. See the circuit carefully and be sure to capture the connection wires and dots that tie in the vertical bus.

3) Press Enter.

4) Choose the base point and then the second point for the move.

Add Existing Circuits to the Icon Menu

1) Go to Schematic tab then click on edit components panel then circuit drop down and then Save circuit to Icon Menu.

2) Right click on the save circuit icon menu dialog box in the Symbol Preview window and select Add icon and then got to add circuit.

Note: You can also choose the arrow on the Add tab and select Add circuit.

3)During the add existing circuit dialog box, decide:

  • Name of the icon

  • Use of Image file. Be sure of selecting the Create PNG from current screen image.

  • Existing circuit name.

4) Click Ok

In the bottom the existing circuit is added of the symbol preview window.

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ALSO READ : 1)  A Quick Reference To Auto CAD Electrical!


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A Quick Reference To Auto CAD Electrical!

Symbol Libraries

Complying with the standards, the Auto CAD Electrical offers library symbols like:

  • IEEE 315/315A
  • IEC-60617
  • NFPA

You can find the symbol’s location in Users| Public| Documents| Autodesk| Acade{versions}|Libs.

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Icon Menus

For inserting the schematic and panel components use the icon menu. Icon menu is defaulted by the program’s ACE_<standard>_ MENU>DAT for schematic symbols and ACE-PANEL_MENU.DAT for panel symbols.

You will find these menu files located in users

{username}|AppData|Roaming|Autodesk|AutoCAD Electrical {version}| {release}|{country code}| Support.


Catalog Lookup

In parts catalog database these search sequence and naming conventions are used:

<project name>-CAT.MDB situated in the same folder like the .wdp file for active project.

DEFAULT_CAT.MDB situated in the same folder as the . Wdp file for the project that is active

DEFAULT_CAT.MDB situated in |Users| {Username} | Documents| Acade {version} |AeData| {language code} | Catalogs

DEFAULT_ CAT>MDB situated in a support folder.


Graphical footprint symbols to catalog part numbers are mapped. Here are few search sequence and naming conventions used:

<project name>_FOOTPRINT_LOOKUP.MDB located in the same folder as the .wdp file for the active project.

FOOTPRINT_LOOKUP.MDB situated in | Users|

{username}\Documents\Acade {version}\AeData\{language code}\Catalogs

FOOTPRINT_LOOKUP.MDB situated in a support folder


The schematic symbols are mapped when inserted form panel footprints. Let us see the search sequence and naming conventions used over here:

<project name>_SCHEMATIC _LOOKUP.MDB situated in the same folder as the .wdp file for the active project.

SCHEMATIC_LOOKUP>MDB situated as the .wdp file for the active project

SCHEMATIC_LOOKUP.MDB situated in |Users|

{username}\Documents\Acade {version}\AeData\{language code}\Catalogs

SCHEMATIC_LOOKUP.MDB situated in a support folder


Used while converting description or switch position component text from one to another language. Situated in Users\{username}\Documents\Acade {version}\AeData\{language code}\Catalogs.


Used for generating PLC I/O modules. Situated in |Users|

{username}\Documents\Acade {version}\AeData\{language code}\PLC.



Available circuits are defined along with circuit types, and defaults for each option inside a circuit. Situated in\Users\Public\Documents\Autodesk\AcadE {version}\{language code}\Support.


Annotation of circuits, defines values, engineering calculations and offers wire type analysis.

Din Rail and Wire way


Parametrically used for generating din rail and wire way. Situated inUsers\{username}\Documents\Acade {version}\AeData\{language code}\Catalogs.



Various component selection descriptions are listed, accessible by clicking defaults on the insert/edit dialog boxes.


The family codes are mapped with new values overriding the tag code in the family of the library symbols.


Attribute mapping file for Title Block Update.


In reports use User-defined attribute lits.


The generic LINEx labels are customized in the various title block and information project dialog boxes.


The installation of default list and location codes, connected by clicking project in the location or installation section of the Insert/Edit dialog boxes.

Schematic Symbol Naming Convention

  • H or V is the first character for horizontal or vertical wire insertion.
  • The following two characters are interchanged for family type (for instance, PB for push buttons, CR for control relays, LS for limit switches).
  • For child contacts the fourth character is generally a 2 and 1 for everything else ( standalone or parent component).
  • The fifth character is 1 for normally open, 2 for normally closed if the symbol is in contact.
  • Rest of the characters are not specified and they keep the names unique. Symbol names are restricted for 32 characters.

Replaceable Parameters

Parameters that are replaceable are codes used for defining tagging formats.

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In AutoCAD Electrical Location/Installation codes are significant part of the design and need to be used in reports, for organizing information transfer to Autodesk Inventor. There are various cases this information is included to each component one at a time.


All you need to do is a location box needs to be inserted around one or more components. Updating option is existing with you and the location and installation codes for the parent components inside the box for apt an similarity with the location box.

Here are few location box awareness based AutoCAD Electrical commands:

Into a location box the insertion or transferring of a component updates the location and installation values of the component.

The choice for updating the location and installation values is initiated by moving a component out of a location box for the components to have a good compatibility for matching the drawing values.

It shows whether the insertion of a component is considered inside or outside a location box.


1) Click on Schematic tab then to Insert components panel find a drop down of Location Box click on Location Box.

2) Insert Location Box- here you will find

  • Rectangular Box
    • Select first point
    • Select Second point
  • Orthogonal shape
  • Input 9 in the command line
  • Select as many points required for including the components needed.
  • Declare c in the command line for closing the shape.

3) Location Dialog Box

  • Provide Location and/or Installation code that is utilized for the browse to select an existing code from the project or LOC file. Like and pick a component can also be used from the active drawing for setting the codes.
  • Whether for updating the location and installation values, select it for the parent components inside the box for matching the values of the location box.
  • The visibility of the location is selected and installed with attributes of all the components inside the box.

Text Height- Input the details of height or select the Pick Height button for choosing a text object on the drawing with the desired height.

Box description– Input the description value.

Description insertion point– Modify the location for the description text. If rectangle is not the shape of the box then the button is disabled.

Use= Installation + Location Values- Based on the location box values enter a predefined value.

Use Location-Installation values=Based on the location box values insert a predefined value.

Drawing- Shows all Location Box Descriptions- Drawing dialog box. Select a description from the list.

Pick Like– Location Box dialog box has temporary exist so you can choose a current description value on the drawing.

4) Edit Component command is used for editing a location

Adding important location must be a streamlined process and information of the installation code to your project data must speed up the process maintenance and integrity.

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Explain HMI software in detail?

A way for interacting with machine operators and for managing a system Human Machine Interface (HMI) is used. Graphical User Interface is the mode of interaction which helps in information exchange and communication between two types of HMIs; a superlative level and a machine level.


It is designed for either machine level HMI or supervisory level HMI with software suitable for both types. They have costly outset of software applications but can reduce long term costs and reduce redundancies in the future.

Choosing HMI software usually starts with an analysis of specified products and features. The system architecture, performance requirements, cost of procurement needs, integration and operations are the key features of this software.

This actually means the operator through some sort of GUI. The future of HMI systems permit operators to see diagrams, detailed system schematics, digital photos, etc. For motion control applications, visual GUI can vary from simple 4 line x 20 column text displays for monitor coloring with touchscreen colors.

For presenting some information to the operator through some GUI, HMI is used normally. You will find high class HMI systems for allowing operators for diagram viewing . Normally standard versions are used on low-cost systems for non task-intensive stuffs.

For performing some basic control functions, HMI unit is programmed and is used for editing servomotor parameters and even issuing all round commands for control axes on a machine.

HMI’s basic type has them placed with only simple functions for viewing the processes or creating simple modifications to some individual variables or parameters or setpoints.

For touchscreen functionality there are some HMI editor softwares available through a range of dimensions and colors. Other than that they provide control functions for industrial automation machines. They offer control functions for automation of industrial machines. Windows-based and screen editor software are used for programming. It can allow fast editing of schematics and set suitable protocols for communication.

The displays are completed by HMI accessories relying on the requirements of the operator. Relying on the application complexity there are variety of I/O options there such as the number of digital or analog inputs or outputs and communication protocols vary from simple RS-232 links to superlative protocols like CANopne, SERCOS, and Ethernet-based communications.

Mobile networks communication are backed up through ControlNet and DeviceNet. The former offer high speed transmission of time critical data message and I/O data. The later manages industrial devices like limit switches, drives, motor starters, photoelectric cells, operator displays, and valve manifolds to PC and PLC. HMI software data management between the machines and operator interactions are offered by the use of both the communication systems.

Structured around mobile there are more sophisticated HMI softwares with portable platforms like Microsoft Windows CE platform, scalable version of Windows Operating System and handheld devices. As the operating system is shared on machine-level embedded HMI, solid-state open HMI machines, shared HMI servers and portable HMI devices.

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What is a Block and explain Block diagram?

Blocks or system building blocks are modular structures with SysML (Systems Modeling Language) that shows statistical concepts and objects in the system. In the era of software development for instance blocks describe operators and data elements or control flow elements. There are many identifiable properties in a block diagram and when taken together, defines the block in a question. A collection of parts representing a specific role in a specific context is called blocks under a system.

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Define Block Diagram

It is a system represented in a graphical format. A functional view is provided by the system because of this. A better understanding is provided by this graph of a system’s functions and help making interconnections within it. They obtain their name from the rectangular elements found in this type of diagram. For hardware and software systems representation this process is used. According to the function and structure block diagrams are described and defined as well as their block relationships.

Significance of block diagrams

An important method for developing and describing hardware or software systems is called block diagram. They are well represented in work flows and processes. They are used in electronics for representing systems and shifting for instance mechatronic systems in trucking industry.
For the virtualization of information or flow of control is significant; block diagrams are used. In this way we can provide complex algorithms or information flow or individual components communication within a big system.

For making detailed descriptions block diagrams are used especially for their interfaces and other aspects of the system structure.

Blocks and Their properties

Describing various hierarchies and connections between individual building blocks within a system is called block diagrams. You can represent them in the form of blocks. Values of dependent relationships among properties and their constellations and behavior are described. For providing simplified representations of functional processes block diagrams are used and it also shows the relationships between individual building blocks in a system. Parts and properties of the blocks are integrated in a particular way and it can be described in a new way of program- the internal block diagram.

Internal Block Diagrams

OMG SysMLtm (Systems Modeling Language) is used for describing structure and flows within system blocks. You will get an overview of how various parts of blocks have relation with each other after viewing internal blocks. Also the material flow between elements, data, information, and the direction of lows can be determined.

Elements in Block Diagrams

Block: Physical and Logical components for the system.

Part: Aggregation and association is used with all the modeled aspects.

Reference: Aggregation and Association are used for all the parts that have been modeled.

Standard-Port: System block and environment interaction point.

Flow-Port: Appearance of a block through a point of interaction.

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Explain Ladder Logic And Its Advantages?

For creating and representation a program a Ladder logic programming language is used via ladder diagrams that relies on circuit diagrams. It is mainly used for creating programs or software for Programmable Logic Controllers (PLCs), used for industrial applications.


Initially the language evolved with being a technique for documenting the construction and design of relay racks in producing and processing control with each relay rack given with a symbol on the ladder diagram that is device connected under them with vertical rails. You will find a rung in a ladder look alike called as relay symbols.

It is not a procedural or an imperative language but a rule-based language. All the rungs in the ladder symbolizes a rule. These rules execute immediately and simultaneously when implemented to relays and various electromechanical devices. If PLCs have the program applied then the rules have sequential execution through software with a continuous loop. With quick execution of loops the effect still exist simultaneously and immediately within the required time tolerance. The PLC capabilities is used during programming as the electromechanical nature of the devices connected to it and not keep up with the instructions that some rules are skipped and the devices cannot cope up with it.


In the industrial settings of the programming PLCs this Ladder Logic is widely used for sequential control of manufacturing processes and required operations. For programming simple and critical systems this programming language is used for reworking hard-wired systems into new programmable ones. In highly sophisticated and automation systems this programming language is used especially in electronics and car factories.

A personnel without programming backgrounds can easily perform and this is the concept of ladder logic as it uses the conventional and familiar symbols of engineering programs. This advantage is quickly negated since producers of PLCs offer ladder logic programming systems offers ladder logic programming system with their products. It does not have the same symbols and convention as the ones made for other models of PLCs from other producers. The programming system is for specific models and there is no easy way of porting the models and it must be rewritten.

Advantages of Ladder Logic

1.Familiar Programming Language

2.Cost-Effective Equipment

3.Reliable Parts

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