Siemens SINUMERIK 828D Function Manual page 37

Channel-specific signals (DB21, ...)
PLC to NC:
• Control signal "Delete distance­to­go"
NC to PLC:
• NC status signals (NCK alarm active)
Axis/spindle-specific signals (DB31, etc.)
PLC to NC:
• Control signals to axis/spindle (e.g. follow­up mode, servo enable, etc.)
• Control signals to drive (bytes 20, 21)
NC to PLC:
• Status signals from axis/spindle (e.g. position controller active, current controller active, etc.)
• Control signals from drive (bytes 93, 94)
Function interface
The function interface is generated by function blocks (FB) and function calls (FC). Function requests, e.g. to
traverse axes, are sent from the PLC to the NC via the function interface.
References
For detailed information about the following subject areas, please refer to:
• Description of the basic PLC program:
→ Function Manual, Basic Functions, Basic PLC Program (P3)
• Description of the event-driven signal exchange (Auxiliary and G functions):
→ Function Manual Basic Functions; Auxiliary Function Output to PLC (H2)
• Overview of all interface signals, functional and data components:
→ Parameter manual
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
A2: Various NC/PLC interface signals and functions
1.2 NC/PLC interface signals
37