PLC Scan Time & Pulse Capture

Estimate whether your PLC can detect short pulses based on scan time, input update rate, and filtering. This helps explain missed counts, unreliable sensors, and fast machine events.

Open Calculator PLC Troubleshooter

What this helps you do

Predict missed pulses
Understand scan time limits
Decide when high-speed inputs are needed
Debug intermittent counts

Where This Fits in PLC Troubleshooting

Problem Solver → PLC Troubleshooter → Input Issues → Pulse Capture

Pulse Detection Calculator

Pulse Width (ms)

Scan Time (ms)

Input Update (ms)

Filter (ms)

Enter values and click Calculate.

PLC Inputs Troubleshooter PLC Hub

Why Pulses Get Missed

Pulse shorter than scan time
Input filter too long
Remote I/O latency
Slow task rate
No hardware latch