Category: PLC Basics
PLC Misses a Sensor Pulse? A Faster Screen Won\’t Fix the Scan
A short pulse can occur entirely between ordinary input samples.
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PLC Watchdog Fault Appears Randomly? Average Scan Time Can Hide It
A task can look fast on average and still exceed its allowed execution time during a rare path.
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Normally Closed Sensor, Normally Open Contact? The PLC Logic Trap Explained
The contact drawn in ladder logic does not necessarily describe the physical contact inside a sensor.
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Is 4 mA a Zero Reading or a Fault? Stop Treating Every Low Value the Same
A low process value and an invalid measurement are not interchangeable.
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Your PLC TON Timer Keeps Resetting? Look for the One-Scan Dropout
A timer that never finishes may be doing exactly what its instruction requires.
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TOF Timer Still On After the Input Turns Off? That May Be the Point
An off-delay timer intentionally keeps its output condition active for a period after the enabling condition disappears.
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Retentive Timer Won\’t Start From Zero? Check the Reset Contract
A retentive timer is designed to preserve accumulated time across the interruptions defined by its instruction.
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PLC Disaster Recovery Guide: How to Protect Your Control Systems from Unexpected Failures
Programmable Logic Controllers (PLCs) are the backbone of modern manufacturing.When a PLC fails—whether due to hardware damage, corrupted logic, power issues, cyberattacks, or accidental overwrites—the result can be catastrophic: production stops, scrap increases, and recovery time can stretch from minutes to days. A proper PLC disaster recovery plan ensures you can restore your system quickly,…
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5 HMI Design Mistakes to Avoid: A Practical Guide for Better Industrial Interfaces
5 HMI Design Mistakes That Hurt Usability (and How to Fix Them) A Human–Machine Interface (HMI) is one of the most critical components in industrial automation. It’s the operator’s window into the machine.Yet many HMIs are still designed with confusing layouts, poor visibility, and unnecessary complexity—leading to downtime, operator errors, and slower troubleshooting. Here are…
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When You Need a Safety PLC: A Complete Guide to Safety Requirements and Industrial Compliance
In modern industrial automation, safety is no longer optional—it’s a regulatory, operational, and ethical requirement. As machinery becomes faster, more complex, and more interconnected, traditional safety relays are no longer enough for many applications.This is where a Safety PLC (Programmable Logic Controller) becomes necessary. Whether you’re designing a new machine, upgrading old equipment, or ensuring…
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