Interactive Controls Demo
Robot-to-PLC handshake simulator
A live model of the four-way handshake I use to coordinate a FANUC robot with a PLC during machine tending — request, acknowledge, complete, and clear — with auto/manual modes, non-critical status flags, and fault, hold, recover, and abort behavior. It runs entirely in your browser with original code; no customer logic is exposed.
Why A Four-Way Handshake
Neither side moves until the other confirms — so no edge is ever missed.
A two-way pulse can be lost if one controller scans slower than the other. A four-way handshake makes every transition wait for confirmation: the PLC requests, the robot acknowledges, the robot reports complete, then the PLC clears the request before the robot clears its flags. That interlock is what keeps a cell recoverable when something stalls mid-cycle.
- Mode
- Auto
- Command
- —
- Handshake phase
- Idle
- Cycles complete
- 0
Original demonstration logic. Signal names, the command sequence, and timing are illustrative of general integration practice and do not represent any specific customer's program.