Competency and practice field guide
Two-hand press curriculum scenario: practice plan
Direct answer
The learner can explain why two true inputs are only the starting point, then test simultaneity, release, cycle completion and restart cases.
Written for pLC beginners moving from a simple AND condition toward explicit state, timing and release requirements.
Scope
Left and right commands, Boolean AND truth, input edges, simultaneity window, cycle request, completion, release and restart state.
Signal path
Physical buttons through inputs, edge and time logic, cycle state, output request, modeled press response and completion feedback.
Baseline practice
Both buttons changing from released to actuated as required and producing one bounded cycle followed by complete release.
Edge cases
One button held, delayed second button, bounce, early release, repeated scan, incomplete cycle, restart and power return.
Fault practice
An input, Boolean, edge, timing, state, output-request, feedback, release or restart mismatch.
Transfer to the job
The learning behavior documented separately from any production safety-system requirement and target implementation.
Why is a two-hand press exercise more than an AND gate?
An AND gate proves only that both values are true. A complete behavioral exercise also defines timing, anti-tie-down, release, cycle ownership, stopping and restart.
Should holding both buttons repeat the cycle?
Normally the training requirement should prevent repeat until both controls return to the declared released state, but the exact application contract must be explicit.