r/PLC is a subreddit with 135k members. The most common kinds of discussions are advice requests and solution requests, and the community frequently discusses plc, looking for, automation, struggling, and engineering, and they frequently recommend/review hmi, plc, and software tools.
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."
Popular Themes in r/PLC
#1
Advice Requests
: "“RS Automation” PLC"
8 posts
#2
Solution Requests
: "PLC Ladder Logic Simulator and Learning Platform — Free, No Ads, Feedback Welcome"
5 posts
#3
Pain & Anger
: "easter eggs…"
2 posts
#4
Ideas
: "I got tired of our PLC coding standards living in a PDF nobody re-reads, so I built a linter for Structured Text"
2 posts
Popular Topics in r/PLC
#1
Plc
: "Rate my Plc lab setup & project ideas for Siemens S7-313C and KTP700"
204 posts
#2
Looking For
87 posts
#3
Automation
: "2 yrs in Automation and i feel like the more i learn the more i realize how little i know ; is being a polymath actually realistic in this field or should i just specialize ?"
67 posts
#4
Struggling
43 posts
#5
Engineering
: "I built a browser-based IEC 61131-3 PLC Engineering
environment, looking for people to tear it apart"
35 posts
#6
Control
: "I have 10 no of Sinamics V20 VFD in a Control panel where Modbus is used for frq source. Setting parameter for all VFD manually really drains the energy."
34 posts
#7
Software
: "Duplicating PLC Software."
29 posts
#8
Siemens
: "Bunch of Siemens junk"
27 posts
#9
Hmi
: "What kind of software and adapter do I need to program this old Siemens Hmi?"
23 posts
#10
Modbus
: "ModbusLens v1.1.0 — trying to make Modbus debugging less painful"
20 posts
Products Discussed in r/PLC
Hmi
371 reviews
#1
Weintek
4.1★ from 30 reviews
#2
Red Lion
4.1★ from 27 reviews
#3
Inductive Automation
4.4★ from 25 reviews
Plc
348 reviews
#1
Siemens
4.2★ from 51 reviews
#2
Automation Direct
4.2★ from 30 reviews
#3
Beckhoff
4.7★ from 29 reviews
Software Tools
30 reviews
#1
Filezilla
4.0★ from 2 reviews
#2
SmartGit
4.0★ from 1 review
#3
ChatGPT
4.0★ from 1 review
Flair Used in r/PLC
#1
Bad title
: "Certificate from Siemens"
1 post
#2
Spam
: "The parts of automation nobody talks about until they break the line"
1 post
Member Growth in r/PLC
Yearly
+26k members(23.8%)
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About
GummySearch helps people research Reddit communities by organizing activity, growth, themes, and post-level signals into one place.
This page gives a focused view of r/PLC, including current member size, discussion patterns, product reviews, and related communities to explore.
This data is synced periodically so insights stay current and useful for ongoing research.
Last updated: June 16, 2026