ladder logic - PLC Programming & Automation

The 5 PLC Programming Languages and When to Use Each

September 12, 2026February 3, 2024 by PLC

Ladder rung with Start_PB XIC, seal-in branch on Conv_Run, Stop_PB XIO and Guard_OK XIC driving the Conv_Run OTE coil

Ladder, FBD, Structured Text, SFC and IL compared on real hardware: what Studio 5000 v33 and TIA Portal V18 support, and which one to pick per job.

ControlLogix Ladder Troubleshooting, Rung by Rung

September 13, 2026January 17, 2024 by PLC

Ladder rung with a bug: XIC Conv3 Start in series with XIO Conv3 EStop driving OTE Conv3 Run, with no seal-in branch around the start contact

A rung by rung ControlLogix ladder troubleshooting method: read the highlighting, use cross reference and search, find double coils, read the fault record.

PLC Programming for Beginners: Your First Working Project

September 13, 2026January 8, 1970 by PLC

Ladder rung with Start in parallel with the Conveyor seal-in contact, in series with a normally closed Stop contact and a normally closed Overload contact, driving the Conveyor output coil

PLC programming for beginners without the theory dump: pick a simulator, write a start/stop rung, add a timer and a counter, wire one HMI button.