Siemens SINUMERIK 840C Installation Instructions Manual page 810

12.93
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
NC
Switching logic
Mode switching
Monitoring functions
Structure of spindle control
© Siemens AG 1992 All Rights Reserved
SINUMERIK 840C (IA)
PLC
CONTROL UNIT
Link RAM
Open-loop speed control
Servo position control
Monitoring functions
Measuring circuits
6FC5197- AA50
12 Functional Descriptions
12.7.1 Overview
Command
channel
12–35