MagnaTran 7.1 User’s Manual
Operation
MN-003-1600-00
Wafer Presence Sensors-Extend and Retract
Brooks Automation
Revision 2.2
6-35
Robot moves to
Station T and Z
Does the Station
Have a Wafer
Is Sensor configured
for active arm?
Check Sensor Type
Error Message
Generated
PICK operation
Stopped
REtract Sensor
EXtend Sensor
Is Sensor configured
for active arm?
PICK
Complete
Read Sensor
State
Read Sensor
State
Indicates Wafer
at Station
PICK Proceeds
Indicates NO Wafer
PICK Proceeds
is on End Effector
Check Sensor Type
Error Message
Generated
Pick Operation
Considered Failed
Operations
Proceed
Indicates NO Wafer
at Station
Indicates Wafer
is on End Effector
Read Sensor
State
Read Sensor
State
REtract Sensor
EXtend Sensor
ON
YES
NO
OFF
YES
YES
NO
NO
NO
ON
ON
OFF
OFF
OFF
ON
Pre-Extend Test
Successful Action Test
YES
Perform PICK
Proceed
Proceed
Figure 6-10: Pre-Extend and Successful Action Flowchart
Robot retracts if necessary
without check
Presence Sensor?
Does the Station
Have a Wafer
Presence Sensor?
Proceed
Proceed