Difference between HMI and PLC


What is a PLC?
The PLC stand for Programmable Logic Controller. They are most usually applied in industrial applications, it generally lacks a keyboard, mouse, and a monitor, as it is normally programmed to run a system or machine.
The system or machine user seldom interacts directly with the program of PLC. When it is required to either create or edit the program of PLC, a PC is usually connected to it.
The PLC has a significant capability for real-world I/O connectivity. Most models of PLC feature a huge variety of interchangeable modules of I/O, which let for suitable interfacing with virtually any kind of laboratory or industrial equipment.
Mainly PLCs are programmed in a Ladder Logic. Ladder Logic is fundamentally a program of Boolean logic-solving with a graphical user interface planned to look like a basic wiring diagram, common to all electricians industry.

What is a HMI?
A HMI sometimes also known as a MMI. HMI is stand for Human to Machine Interface and MMI is stand for Man to Machine Interface. Even though MMI is not supposed to be politically correct now that term less and less.
The job of HMI is it to translate the signals and intentions from a human into signals of electric for the information system of machine to use. Therefore in doing so, lets the human operator to create interactive changes in the data and software process.
HMI its quite frequently has a display integrated into them as well to allow the operator to distinguish the relevant data to the action being carried out.

The computer evolution has and continues to have a big impact on the industry and society. We are in an amendment cycle with the current evolution of computer, but more significantly we are trying to amend to meet the transformations for the next decade. Software and hardware are persistently being improved. Computers are now more powerful and will ultimately give a human to machine interface.

While other tool is PLC hence and based supports interface. One of the equipment is said to be technology of Human Machine Interface based and is said that it does not comply for network interface or computer. It has a port of USB which can help to download data.

From the qualifications below are the some diversities between HMI and PLC
HMI:
1. There will be unit display in HMI with the buttons of function.
2. It is able to monitor what current happenings during executions.
3. HMI is able to operate in both manual and auto mode.
4. It is able to change the set point.
5. HMI is usually a touch screen of the PLC
PLC:
1. There is no unit display.
2. The user can not monitor what happening in the execution in the PLC.
3. PLC called as programmable logical circuit.
4. PLC running only in auto mode. User can not proceed if there is error during the operation till it repaired or corrected.
5. The set point can not be adjusted in PLC. If requires to be adjusted then the program license must be downloaded.

PLCs are inserted type controllers of ladder logic with set-points of programmable parameter for a control function of automation. Commonly, HMI is a PC based interface with frequently configurable software and broader functionality.

An HMI will need far bigger control and validation, and will be judged for the compliance of 21 FR pt11. It will all base on the HMI/software functionality that you have for the FBD. It would that it is unlikely the HMI can not be obsessed up to a PC or printer if you need it.

Hopefully this article can add your insights.
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All Labels

  1. ABB PLC
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  9. Arduino
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  11. Audio and PLC
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  13. Baldor PLC
  14. Battery Level Indicator using PLC Analog
  15. BMS
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  18. CIMON PLC
  19. Click Series PLC
  20. Computer Vision
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  26. CX-One
  27. DCS
  28. DDC
  29. DELMIA V5
  30. DeltaV
  31. Digital Input
  32. DirectLogic PLC
  33. DirectSOFT PLC
  34. Eaton PLC
  35. Elevator with PLC Program
  36. EPICS PLC
  37. Fatek PLC
  38. Festo PLC
  39. Fieldbus
  40. Forex Trading and PLC
  41. FPGA PLC
  42. GE Fanuc PLC
  43. GP proface
  44. GX Developer
  45. Heater Controller with PLC
  46. Hitachi PLC
  47. HMI
  48. Home Automation
  49. Honeywell PLC
  50. IDEC PLC
  51. Internet of Things
  52. IoT
  53. Keyence PLC
  54. Koyo PLC
  55. LED Display
  56. LG PLC
  57. Lock Unlock Door Using PLC
  58. Logixpro PLC
  59. Maple OIT
  60. Matsushita PLC
  61. MELSEC A
  62. MELSEC Q
  63. Memory PLC
  64. Micro PLC
  65. Microcontroller
  66. MicroLogix 1000
  67. MicroSmart PLC
  68. Mitsubishi PLC
  69. Mobile Application
  70. Modbus
  71. ModBus Communication
  72. ModBus RTU
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  74. Modicon PLC
  75. Momentum PLC
  76. Motion Control
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  78. Omron PLC
  79. OPC
  80. PAC
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  86. PLC and Android
  87. PLC and Arduino
  88. PLC and CNC
  89. PLC and Computer
  90. PLC and Facebook
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  110. PLC for Injection Molding
  111. PLC for Marking
  112. PLC for Packing
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  114. PLC for Snack Vending Machine
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  116. PLC for Water Treatment
  117. PLC Hardware
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  122. PLC Link Model
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  127. PLC Simulator
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  134. PLCSIM
  135. Power Supply for PLC
  136. Profibus
  137. ProSafe PLC
  138. Push ON Push OFF with PLC
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  141. Raspberry Pi and PLC
  142. Read Data
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  146. SCADA
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  148. SHARP PLC
  149. Siemens PLC
  150. Simple ModBus
  151. SINUMERIK CNC
  152. Small Modular PLC
  153. Standard Sequence Programming for PLC
  154. Substation Automation System
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  156. Telemetry
  157. TEP PLC
  158. Texas Instruments PLC
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  160. Toshiba PLC
  161. Touch Screen PLC
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