Yaskawa YASNAC PC NC I/O Signal Function Manual - Manual (Page 56)

6 - 15
YASNAC PCNC I/O Signal Function Manual Chapter 6: Operation Support Functions
6.10 Machine Lock Input Signal
The machine lock input signal is used to prevent output of the output pulses of the PCNC to servo
units.
The machine lock function is used to check a new program without actually moving the axes.
When the MLK input signal is “closed”, although the logic circuit distributes pulses, the axes are
not moved (both in automatic and manual mode operations).
Since the logic circuit distributes pulses, the position data is updated as the axis move commands
are executed.
To change the status of the MLK input signal from “closed” to “opened” or from “opened” to
“closed”, the PCNC must be stopped. In other words, if the MLK input signal status should be
changed, the PCNC must be in the Block Stop state or Feed Hold state. If it is changed when the
PCNC is in other states, attempted change is ignored.
By using the AMLKX(#30840) to AMLK5(#30844) input signals, the machine lock function can
be called for the individual axes.
If the MLK input signal is “closed” during single-block mode operation, the machine lock func-
tion becomes valid after the block stops.
6.11 Auxiliary Function Lock Input Signal
The auxiliary function lock input signal is used to omit the execution of the M,S,T and B func-
tions for the execution of a part program in automatic mode.
If the AFL input signal is “closed”, the PCNC ignores the M,S,T and B commands specified in a
part program. The code/decode output sugnals (M00R, M01R, M02R and M30R) are output,
however. Analog D/A signal is also output to the spindle.
If the AFL input signal status is changed from “opened” to “closed” or from “closed” to “opened”
during the execution of a part program, the program is executed according to the selected AFL
input signal state from the block next to the one currently being executed.
Machine Lock Input Signal MLK #30066
Axis-dependent Machine Lock
Input Signal
AMLKX to AMLK5 #30840 to #30844
Auxiliary Function
Lock Input Signal
ALK #30067