10.94 12 Functional Descriptions
12.20.1 Functional description
12.20.1 Functional description
The term "Extended stop and retract" refers to the error reactions listed below:
• Parameterization of error reaction by means of machine data and part program commands
• Monitoring sources (error identification)
• Shutdown of machine in order to prevent damage to tool or workpiece wherever possible
• Separation of tool and workpiece through traversing motions (retractions) initiated in the
event of an error/fault
The 840C system and SW version 4 provides an extended functionality for the retraction
operation. The axes/spindles (drives, motors, encoders, etc.) and the control involved in the
controlled stop and retract process must all be operational: If one of these components fails,
the full scope of the system reaction described below may not be available.
"Extended stop and retract" comprises the following functions:
• Monitoring sources (error detection)
• DC link buffering (generator operation)
• Stopping and
• Retraction
Both the sources for error detection and the reactions in the form of stop and retraction can be
• parameterized via machine data (NC and drive)
• controlled via the PLC and/or
• programmed by means of G commands.
Both sources and reactions can be
• internal and/or
• external.
12.20.2 Parameterization, control and programming
The "Extended stop and retract" function comprises:
1. Parameterization of the operating characteristics via machine data:
• General machine data:
– To enable the new operating characteristics for the stop process
– To parameterize the times for extended stopping
• Machine data specific to channel/mode group:
– To assign the mixed I/O modules for the retraction operation in the form of:
- Inputs (external sources) and
- Outputs (external reactions).
– Application of internal sources:
- Mode group stop
- EMERGENCY STOP
which must initiate a retraction operation.
– Definition of internal reactions to be initiated in the case of a retraction operation:
- Alarm and mode group stop
- Retraction operation as open-loop control function and/or as
- Autonomous drive function
• Machine data specific to axis/spindle:
– To assigned the mixed I/O modules for the retraction operation in the form of:
- Outputs (external reactions)
© Siemens AG 1992 All Rights Reserved 6FC5197- AA50
12–213
SINUMERIK 840C (IA)
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