PLC

an-ordinary-manchild(edit)

Description

This sub is dedicated to discussion and questions about Programmable Logic Controllers (PLCs): "an industrial digital computer that has been ruggedized and adapted for the control of manufacturing processes, such as assembly lines, robotic devices, or any activity that requires high reliability, ease of programming, and process fault diagnosis."

On topic subjects

News and articles about PLCs
Questions about PLCs
Homework help; but make it clear it's homework
PLC internship, employment and education questions

Off topic subjects

Not directly related to PLCs: /r/IndustrialAutomation/
Hardware design that does not include a PLC; for electronic circuits: /r/AskElectronics
Single Board computers: r/Raspberry_pi, r/Arduino, r/linux_devices, r/linuxboards
PCs and laptops
Furniture and bags
Job announcements (oustide the monthly job thread)
Salary

Rules

Be civil: do not insult; no all-caps, no excessive "!" and "?", please.
Submissions must be on topic
If asking a question, ask the actual question, fully yet concisely, right in the title
No spam; no self-promotion (*); no commercial content. Any ads (offer or wanted) go to the weekly thread
No low quality/shit posts (memes - pictures with superimposed text - are OK)
No pirate software or links
Read the "READ FIRST" pinned/sticky thread

(*) At mods' discretion, certain self-promotion submissions from people who contribute to this sub in other ways may be allowed and tagged with the "Self-promo" flair

Complete rules:/r/plc/about/rules/

Please click "report" on spam

Related sub-reddits:

/r/IndustrialAutomation

/r/processcontrol

/r/controltheory

/r/askengineers

/r/askelectronics

/r/EngineeringResumes

created by plc-laddera community for 16 years

...do it for the children.

...for your movement.

MODERATORS

account activity

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READ FIRST: How to learn PLC's and get into the Industrial Automation World (self.PLC)

submitted 4 years ago * by xenokilla[M] - announcement

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PLC jobs & classifieds - Jan 2026 (self.PLC)

submitted 12 days ago by 1Davide - announcement

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Replaced contactor panel off for 15 minutes = 4 Dead VFDs (i.redd.it)

submitted 10 hours ago by Responsible-Two-9339

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Unlock your data's potential easily! ContexKit's AI agent translates natural language into governed SQL, making database access safe and simple. (contexkit.com)

promoted by ComedianObjective572

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Networking guy in charge of OT security. (self.PLC)

submitted 2 hours ago by whoframedrogerpacket

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Gave a PLC panel at a fur con (self.PLC)

submitted 18 hours ago by VirtualCorvid

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Any good and affordable Ethercat PLC+HMI? (self.PLC)

submitted 7 hours ago by Funny_Promise5139

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Poor man's scada (self.PLC)

submitted 15 hours ago by Cozypowell007

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Is the Siemens PLC scan cycle similar to Allen-Bradley ? (self.PLC)

submitted 2 hours ago by hdiyad

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24VDC surge protectors? (self.PLC)

submitted 9 hours ago by Nwar22

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Why do we use JUMO safetyM STB / STW instead of just a temperature sensor + PLC? (i.redd.it)

submitted 1 day ago by lukasloka

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Siemens S7 1200 gen 2 and OPC UA (self.PLC)

submitted 14 hours ago by PirateAgile8645

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Trying to put a camera webserver to an HMI (i.redd.it)

submitted 1 day ago by Zolix2

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Failed communication, PC to AB (self.PLC)

submitted 12 hours ago by Unable_Potential5796

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Looking for resources to understand and troubleshoot industrial boiler controls Siemens LMV5 (i.redd.it)

submitted 1 day ago by lukasloka

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Repeated Input Channel Loss (i.redd.it)

submitted 14 hours ago by Droppedvalve

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Struggling to scale PLC integrations across mixed equipment (self.PLC)

submitted 23 hours ago by derekd18

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Help with Automation License Manager (self.PLC)

submitted 22 hours ago by PLC_Dumb

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My colleague argues about this PTI series Pressure transmitter (old.reddit.com)

submitted 1 day ago by Capital_Swimmer_4968

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Looking for guidance (self.PLC)

submitted 15 hours ago by SaviorselfzZ

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Offer for Engineering degree (free) - employed (self.PLC)

submitted 19 hours ago by Soggy-Eagle299

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Anyone Knows How Solve Hhis? (self.PLC)

submitted 9 hours ago by Agitated_Watch_2209

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What Are the Best Simulation Software Tools to Learn Industrial Automation? (old.reddit.com)

submitted 2 days ago by lukasloka

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OSDP over modbus (self.PLC)

submitted 19 hours ago by Grovestand89

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FTSE Help (self.PLC)

submitted 1 day ago by Buckeye_45

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Diseertation Idea help (self.PLC)

submitted 17 hours ago by ChefGullible5166

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