: Signals from the CNC to the PMC (e.g., "spindle at speed" status).
The PMC is essentially a specialized Programmable Logic Controller (PLC) embedded within the Fanuc control. It uses , a graphical language based on relay logic circuit diagrams. It was originally designed to replace hard-wired relay panels, making it intuitive for electricians to understand. fanuc ladder logic
FANUC uses a . Memorize this table: