r/PLC is a subreddit with 136k members. The most common kinds of discussions are advice requests and solution requests, and the community frequently discusses plc, looking for, automation, struggling, and control, 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"
16 posts
#2
Solution Requests
: "Can anyone help identify: What this error means? Possible causes Troubleshooting steps This is used on an oil rig control system. Any help would be appreciated."
4 posts
#3
Pain & Anger
: "easter eggs…"
3 posts
#4
Ideas
: "If you rebuilt your machine today, what would you choose differently?"
1 post
Popular Topics in r/PLC
#1
Plc
: "Rate my Plc lab setup & project ideas for Siemens S7-313C and KTP700"
178 posts
#2
Looking For
87 posts
#3
Automation
: "4 Weeks as Automation Engineer - Advice on PLC Programmring?"
71 posts
#4
Struggling
44 posts
#5
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."
37 posts
#6
Engineering
: "Is it possible to get into Automation without Engineering degree ?"
35 posts
#7
Siemens
: "Bunch of Siemens junk"
29 posts
#8
Software
: "Duplicating PLC Software."
25 posts
#9
Hmi
: "What kind of software and adapter do I need to program this old Siemens Hmi?"
23 posts
#10
Modbus
: "Completely in over my head with Modbus"
19 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
Off topic
: "Star-Delta Issuer"
4 posts
#2
Spam
: "The parts of automation nobody talks about until they break the line"
1 post
Member Growth in r/PLC
Yearly
+26k members(23.7%)
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About
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Last updated: June 23, 2026