PLC-Laddertesting
6 posts
How to Test an Ignition HMI Without a PLC: OPC UA Against Simulated Logic
Test an Ignition HMI without a PLC: point the gateway's OPC UA client at simulated logic, bind real tags, and verify screens before the hardware ever arrives.
How to Test an Ignition HMI Without a PLC: OPC UA Against Simulated
Test an Ignition HMI without a PLC: point the gateway's OPC UA client at simulated logic, bind real tags, and verify screens before the hardware ever arrives.
Catching Unsafe PLC Logic Before Commissioning: Find Ambiguous Control Behaviour Early
How to catch ambiguous and unsafe PLC control behaviour before commissioning: the six bug classes, simulation-first testing, and structured test injection.
Most commissioning rework starts as an unread assumption
Why control logic fails at FAT, and how to surface ambiguity and unsafe behaviour while it is still cheap — before the panel is powered.
Free Online PLC Simulator: Test Ladder Logic Without Hardware
Test ladder logic in your browser before hardware: how the scan cycle works, what to simulate (seal-ins, timers, interlocks) and a worked conveyor example.
Testing PLC Logic Like a Protection Engineer: CSV Injection Files
Protection engineers inject a table of quantities and check what trips. The same method for PLC logic: CSV scenarios, checked at the outputs, not internals.