Industrial Automation, PLC, VFD, and Troubleshooting
PLC Addressing: Rack/Slot vs Tag-Based
In a PLC system, every input, output, and internal memory location needs a way to be identified by the controller.
This identification method is called addressing.
In simple …
Read MoreLadder Logic is one of the most common PLC programming languages used in industrial automation.
It was designed to look similar to electrical relay control circuits, which makes it easier for …
Read MoreSeal-In Circuits Explained
A seal-in circuit is one of the most important basic patterns in PLC ladder logic and relay logic.
It is commonly used when an operator presses a momentary Start …
Read MoreTimers are one of the most common instructions used in PLC programming.
A timer allows the PLC to use time as part of the control logic.
In simple words:
A PLC timer waits …
Read MoreIn the previous post, we covered the basic PLC timer instructions:
TON = Timer On Delay
TOF = Timer Off Delay
RTO = Retentive Timer On
Now we are going one step deeper.
In real …
Read MoreIn industrial automation, a PLC program is not just a file.
It is the brain of the machine.
If the PLC program is lost, outdated, modified incorrectly, or not documented, troubleshooting becomes …
Read MoreLadder logic is one of the most common programming languages used in industrial automation.
It is used to program PLCs that control machines, conveyors, pumps, valves, motors, packaging equipment, process systems, …
Read MoreA PLC program should do more than make a machine run.
A professional PLC program should be:
OrganizedReadableTroubleshooting-friendlySafeConsistentExpandableMaintainable
In real industrial environments, machines are modified, maintained, repaired, upgraded, and troubleshot by different technicians …
Read MoreIn industrial automation, two words appear constantly in PLC logic:
PermissiveInterlock
They are related, but they are not exactly the same.
Understanding the difference helps automation technicians troubleshoot faster, read ladder logic better, …
Read More
33. PLC Programming Best Practices: Structure, Tags, Comments, and Troubleshooting ( 33 of 35 )
PLC Programming Best Practices
A PLC program should not only make the machine run.
A good PLC program should also be:
Easy to understand
Read MoreEasy to troubleshoot
Easy to modify
Easy to document
Easy to recover
Safe to …