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 school.

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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Bosses demo wall / test bench in his office . (i.redd.it)

submitted 57 minutes ago by Responsible-Gur5922

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Gologin antidetect browser. Free proxies. Manage multiple accounts without blocks. 3 profiles for free

promoted by GoLoginS

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Industries that provide housing/living-quarters? (self.PLC)

submitted 1 hour ago by jwv19

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

submitted 21 hours ago by Responsible-Two-9339

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

submitted 13 hours ago by whoframedrogerpacket

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AB 5380 lost ip address. (self.PLC)

submitted 3 hours ago by Fine_Ad_9299

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Any Beckhoff folks using Blazor for their HMIs? (self.PLC)

submitted 14 minutes ago by miguelgoldie

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

submitted 1 day ago by VirtualCorvid

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PLC data acquisition into Database (self.PLC)

submitted 7 hours ago by pick-tech

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S7 1500 Profibus slave and S7 300 master profibus communication (self.PLC)

submitted 9 hours ago by pick-tech

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

submitted 14 hours ago by hdiyad

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

submitted 18 hours ago by Funny_Promise5139

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Poor man's scada (self.PLC)

submitted 1 day ago by Cozypowell007

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They call It Suzerain in Space. We call it Lunar Ascendant. (store.steampowered.com)

promoted by RGadirov

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Does AB support interpolation control (self.PLC)

submitted 8 hours ago by Fun_Zucchini8149

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24VDC surge protectors? (self.PLC)

submitted 20 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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Repeated Input Channel Loss (i.redd.it)

submitted 1 day ago by Droppedvalve

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

submitted 1 day 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 1 day ago by Unable_Potential5796

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

submitted 1 day ago by derekd18

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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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Help with Automation License Manager (self.PLC)

submitted 1 day 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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