https://studylib.net/doc/27655932/349-810-820-ga3-interface-part-1-signals--sinumerik-810-8...
SINUMERIK 810/820 Interface & Signals Planning Guide
Planning guide for SINUMERIK 810 GA3 and 820 GA3 systems, covering interface descriptions and signals. Engineering, control systems.
sinumerik 810820interfacesignalsplanning