Siemens SINUMERIK 840Di 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 MMC
• NC status signals (alarm signals)
Channelspecific signals (DB21, etc.)
PLC to NC:
• Control signal "Delete distance-to-go"
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., follow-up 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.
2-2
etc.)
Various NC/PLC Interface Signals and Functions (A2)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0