Dear PLC Technical members,

Welcome to the Blog PLC Technical, today in this article, you will learn some of the fundamentals of an HMI, and types of HMI, as well as communication protocols.

Presentation to HMI graphical display

In this article, I would like to show you the Presentation to HMI graphical display. Before we start, the following is the rundown of things you learn.

• Introduction to HMI.
• Types of HMI.
• Communication protocols Types of HMI

1. Definition of an HMI 

A control machine HMI, Human Machine Interface is the graphical presentation that represents a machine, cycle, or facility so the client can, undoubtedly, naturally control and screen the status of such a system.

A basic machine will require a basic interface for the client and not need an HMI. A couple of pointer lights, some press fastens, and switches will be everything necessary to work a straightforward machine, say one that presses parts into a projecting of certain sorts. To rapidly give you a thought of what the lights and press catches would do, is to illuminate the operator that a section was set up and prepared for the following stage along the line to a completed piece. The operator would know now the machine is prepared, add another segment to the part, and press the suitable catch to start the following activity.

1.1 How is it actually connecting to the process?

Programming personals use special software to design the process on a personal computer. in designing, it is downloaded to the HMI panels. The operator uses these animated screens to control the process, and each brand of HMI has its own unique programming software.

2. Types of HMI

2.1 Display size

Ordinarily from 3 inches to 25 inches for SIMATIC HMI panels.

2.2 Monochrome or colored

Color HMI is distinctive what's more, take into account status to handily be appeared with colors, be that as it may, monochrome units are less expensive, what's more, efficient for demonstrating a modest quantity of information, like speed feedback or time left in a batch.

2.3 Screens with keypad or screen touch

Touchscreens are advantageous and permit quick reactions, however, they are more costly than models with just capacity and the keys.

3. Communication Protocols

Programming the HMI needs to program each indicator and button to particular information or on the input or output locations of a PLC, this brings up another point the HMI and PLC need to be viable, this implies they have to ready to converse with one another they do this on what is called a Protocol different.

Communication utilizes various protocol normal. Protocols are like Modbus serial, internet IP, and Profibus. They are all just industrial network kind of like the network.

3.1 Modbus

While connecting a PLC and HMI protocol and communication parameters must be the equivalent on the two devices right wiring associations and practices must be watched.

For example, we are using an Allen Bradley PLC and HMI operator interface. The electrical connection is RS-485, the Allen Bradley PLC will be set up to communicate on the rs-485 port using Rslogix 500 software.

3.2 Ethernet and TCP/IP

• Transport: TCP
• Network: IP

The term TCP/IP identifies with TCP or Transmission Control Protocol, where the IP is Internet Protocol.

In the TCP/IP protocol, there is somewhat a send/get recognize connection among PLC and VFD. The packets go down the stack, received at the VFD associated with your network, a receipt affirmation returns up the stack to the PLC.

This kind of communication protocol might be utilized with a VFD where you order a speed and need to guarantee that the VFD got the message.

3.3 Profibus DP / Profibus PA

Communication Protocol Profibus is a common language between the devices so that devices can talk and react to one another.

There are two principal variations of the Profibus, one Profibus DP represents decentralized peripherals that are utilized to work devices through a concentrated regulator underway production line computerization applications.

Profibus DP uses two centers of protected link, with aluminum sheath, and runs at speeds between nine point six kilobits for each second and 12 megabits every second.

Profibus PA transmission rate is slower than PROFIBUS DP, Profibus PA imparts at a fixed speed of 31.25 kilobits.

Profibus PA devices are planned so that can be appropriate for fire danger conditions, by guaranteeing the stable control voltage, and restricting the current levels to dodge fire peril Profibus DP and Profibus PA can be conveyed.

From here we have finished the subject of the presentation to HMI, and types of HMI, as well as communication protocols, If you like it, please share it with friends until it benefits, and then meet on a new topic on the blog PLC Technical. 

Regards, 

PLC Technical