Industrial Automation, PLC, VFD, and Troubleshooting
In PLC programming, not every instruction directly turns on a motor, counts a box, or starts a timer.
Some instructions are used to control how the PLC program executes.
These are called …
Read MoreIn industrial automation, PLC counters are used when a machine needs to count events.
A counter can count:
Parts
Boxes
Bottles
Cycles
Machine strokes
Rejects
Pallets
Sensor pulses
Production totals
A counter does not count time.A counter counts how many times …
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 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 MoreBefore learning advanced PLC programming, every automation technician must understand the basic logic operations used in ladder logic.
The three most important logic functions are:
AND
OR
NOT
These are the foundation of almost every …
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 MoreHow to Diagnose a Control Panel That Appears Completely Dead
One of the most common troubleshooting situations in an electrical control panel is this:
Nothing works.No lights.No relay response.No motor starter.No PLC …
Read MoreHow to Diagnose PLC-Controlled Circuits Without Guessing
PLC troubleshooting is one of the most important skills for an automation or maintenance technician. In modern industrial panels, the PLC is often the …
Read MoreWhy the PLC Says “ON” but the Field Device Does Not Energize
One of the most common troubleshooting problems in PLC-controlled panels is this:
The PLC output LED is ON,but the field …
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