Industrial Automation, PLC, VFD, and Troubleshooting
In 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 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 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 MoreTo understand PLC programming, you need to understand how a PLC stores information.
A PLC does not only turn inputs and outputs ON or OFF. It also stores data in memory.
That …
Read MorePLC 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 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 MoreIn industrial automation, many machines operate in steps.
A door opens, stops, closes, and faults.A conveyor starts, runs, stops, and detects jams.A filler waits for a bottle, fills, verifies level, and …
Read MoreIn professional PLC programming, one of the best practices is to separate raw physical I/O from the logic used inside the program.
This is done using:
Input BufferingOutput Buffering
Input buffering means copying …
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