Category: PLC

PLC programming, ladder logic, I/O, timers, counters, HMI, real-world projects.

PROFINET Device Is “Not Reachable”: Causes and Step-by-Step Fixes

PLC Can Be Pinged but TIA Portal Cannot Connect

TIA Portal Cannot Find the PLC: Causes and Step-by-Step Fixes

Siemens BF or Bus Fault LED Is Flashing: Causes and Step-by-Step Fixes

Siemens Red ERROR or SF LED Is On: Causes and Step-by-Step Fixes

Siemens CPU Suddenly Goes Into STOP Mode: Causes and Troubleshooting

Siemens PLC Will Not Go Into RUN Mode: Causes and Fixes

Modbus RTU vs Modbus TCP: What’s the Difference?

Sinking vs Sourcing Inputs Explained Simply

PLC vs Microcontroller: Which Should You Use and Why?