Siemens SINUMERIK 840D sl Function Manual page 14

Detailed description
2.1 NC/PLC interface signals
NC and operator-panel-front-specific signals (DB10)
PLC to NC:
• Signals for influencing the CNC inputs and outputs
• Keyswitch signals (and password)
NC to PLC:
• Actual values of CNC inputs
• Setpoints of CNC outputs
• Ready signals from NC and HMI
• NC status signals (alarm signals)
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,
• 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:
• Description of event-controlled signal exchange (auxiliary and G functions):
• Overview of all interface signals, function blocks and data blocks:
8
etc.)
/FB1/ Function Manual, Basic Functions; Basic PLC Program (P3)
/FB1/ Function Manual, Basic Functions; Auxiliary Function Output to PLC (H2)
/LIS/Lists
Basic logic functions: Various NC/PLC interface signals and functions (A2)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0