
B–64153EN/01
7. SAFETY ZONE CHECK
97
ZRN
JOG
SAFRQ
SAFEXE
+X, – X
Movement to X axis
Movement to
position A
ZP1 confirmation
High–speed reference position return
Safety zone position detection
After automatic or manual reference position return along the X–axis,
automatic safety zone setting is enabled when X–axis reference position
return completion signal ZP1 is set to 1. In this case, safety zones can be
set automatically if manual reference position return mode is selected, and
the SAFRQ signal is set to 1. At this time, the workpiece holder position
detector must also be ready for operation.
Then, when feed axis direction select signal +X or –X is entered, the tool
moves along the X–axis to position A, set in parameter No. 16535, either
at the manual rapid traverse rate or at the feedrate set in parameter No.
16536. At this time, the CNC clears the currently set safety zones.
During movement to position A, the CNC memorizes the position of one
end of each workpiece holder at the rising edge of the workpiece holder
position detector signal.
Upon the completion of movement to position A, the SAFEXE signal is
set to 1. If the feed axis direction select signal +X or –X is entered again
after the SAFEXE signal has been set to 1, the tool performs high–speed
reference position return along the X–axis. During high–speed reference
position return, the CNC sets each safety zone by memorizing the position
of the other end of each workpiece holder at the rising edge of the
workpiece holder position detector signal.
Safety zones are set in order from #1 to #2 to #3 to #4 if movement is made
for detection in the positive direction along the X axis during high–speed
reference position return. Safety zones are set in order from #4 to #3 to
#2 to #1 if movement is made for detection in the negative direction along
the X axis during high–speed reference position return.
Upon the completion of high–speed reference position return, the
SAFEXE signal is set to 0 to end automatic safety zone setting. After the
SAFEXE signal has been confirmed as having been set to 0, the SAFRQ
signal is set to 0.
Timing chart
Detection method 2