Siemens SINUMERIK 840C - Manual (Page 810)

12.93 12 Functional Descriptions
12.7.1 Overview
The diagram "Structure of spindle control" provides an overview of the functions available and
also the flow of data and commands. Data flows in the direction indicated:
Setpoints and control data
Actual values and status data
Switching commands
Status
Structure of spindle control
CONTROL UNIT
Switching logic
Mode switching
Monitoring functions
NC PLC
Command
channel
Open-loop speed control
Servo position control
Monitoring functions
Link RAM
Measuring circuits
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SINUMERIK 840C (IA)