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Questions tagged [plc]

PLC (Programmable logic controller) or programmable controller is a digital computer used for automation of electromechanical processes, such as control of machinery on factory assembly lines, amusement rides, or light fixtures.

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PLC , DIGITAL COUNTER

newbie here. I work in a factory that produce electric cables. I'm trying to build a web application that will handle production processes. For this i need some real time data. There are multiple types of machines , some of them are older and uses a…
BadabingBB
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Can I know the memory address of RS-485 in DVP-14SS2?

This is the port of DVP-14SS2 for RS-485 [1]: https://i.stack.imgur.com/yXL9u.png
Jason Lee
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Should a computer science student learn about Programmable Logic Controllers(PLC)?

I want to know that will it be beneficial for a computer science student to take up a course in Basics of Programmable Logic Controllers (PLC) and learn this topic? I mean will this knowledge be useful in later stages?
Yukti Kumari
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Life expectancy of usb stick when datalogging

I know that on average a flashdrive has a life expectancy of roughly 100,000 write cycles. This raises a question for me I have written a program where I write some values to a csv file on a usb stick every 6 seconds. Every day a new file is…
Kpotmake
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Whats the best way to send data from a (WAGO) PLC to an cloud database?

Whats the best way to send data from a (WAGO) PLC to an (DynamoDB) cloud database? Our situation: We have WAGO PLC's(750-880, 750-882, 750-890) installed on site and we would like to send multiple data to an cloud database, preferabel an AWS…
Niels
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How to simulate a micrologix allen bradley PLC?

Currently I'm working on writing data to a test machine that simulates reads from an Allen Bradley PLC in python. This machine is supposed to replicate another that we have live that simply reads the PLC tags, and I don't have any spare PLC's just…
Fastas
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Should HMI devices have RTOS on them?

I know that PLC devices must have RTOS such as VxWorks, but is the same true with HMI devices that connect with PLC?
datum
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How to access all variables in all databases from PLC (without specifying the name of database or variable)?

In the plc database i have a database named "status" which has a variable named "Temperature". Since I know the names, I access the value of this variable like this: from opcua import Client client = Client("url") client.connect() temperature =…
Qendrim Krasniqi
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(Twincat-structured text) Count the button pressed according to the LEDs on

i am doing a remember game similar to Simon Game with Twincat structured text. And i have a problem that how would i check the buttons are pressed same as the LED on, and count how many buttons have been pressed in case you press it wrong? Thanks…
Hoang Ho
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AllenBradley Compactlogix PLC Ethernet IP & C# Communication?

I have Compact Logix Ethernet/Ip PLC. I want to make small scada/hmi on my pc with C#. I can use visual studio 2017 windows forms. I will take some data from plc to pc and I will show on c# and changed some picture image. how can I do communication…
ahmetnoktacom
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I need help getting data into Microsoft Excel from an Allen-Bradley PLC automatically

I need help getting data into Microsoft Excel from an Allen-Bradley PLC automatically each time an "event" happens. For example, each time an alarm for a steam valve turns on, I need to record date, time, and duration of the problem. I can write the…
saiprasad babhale
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how to import c code to TwinCAT

I am quite new to TwinCAT 3.I am trying to import a C code from Dymola to TwinCAT 3.I have gone through BECKHOFF manual but it didn't help much. It would be grateful,if you could help me.
venkat reddy
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Ladder diagram in winSPS

I have to express an RGB led in a ladder diagram using winSPS. I have used CodeSys before but that is all my experience. Can someone help me with the schematic for it?
user3674373
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Writing OPC - need some advice

Im using free fatrat library to create server and i have a few question: On server site i think that I only need to do is give parameter about server like clsid, description, version and create branches and leafs, am I wrong? I dont know either if…
detheroc
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Beginner Level PLC Programming / Simulation and Configuration

I am a beginner in PLC programming and just started to learn by self. Is there any simulation software for PLC in Windows? Do we have a PLC that works on 5 volts DC power supply? Actually for a Industrial project I need to control the following: 1.…
Programmer
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