
B-63494EN/02 3.SAFETY FUNCTIONS
- 15 -
3.1 APPLICATION RANGE
The dual check safety function assumes the following configuration:
A) One protective door is provided.
B) If the protective door is closed, safety is assured.
C) One safety area is provided. However, up to four protective
doors with a lock can be installed within the area.
When the operator makes a request to open the protective door, the
safety functions are enabled, and the protective door can be unlocked.
While the protective door is open, the active safety functions assure
safety. When the request to open the protective door is canceled, the
protective door is locked, and the safety functions are disabled.
The dual check safety function provides these safety functions while
the protective door is open, as described above. Some of the safety
functions continue working while the protective door is closed.
WARNING
Each machine tool builder should take measures to
assure safety while the protective door is closed
and to ensure safety related to a rotation axis and
travel axis. At the same time, safety measures for
the FANUC servo motor or spindle motor need to
be taken, while the door is open.
The dual check safety function has the following safety functions:
Safe-related I/O signal monitoring
This function in redundant mode monitors I/O related to safety
(emergency stop, protective door lock/open/close state, power-down,
safety speed/safety position selection signal, safety position switch,
programmable safe-related I/O signals) in redundant mode. The
emergency stop, protective door lock/open/close state, power-down,
safety speed/safety position selection signal, safety position switch,
and programmable safe-related I/O signals are checked in redundant
mode. If the two corresponding inputs do not match, the system
judges that an abnormal event has occurred. The power-down (MCC
off) signal is output in redundant mode (from two paths). Whether the
2-path output is normal is judged in a MCC off Test.
Safe speed monitoring
This function checks that the rotation speeds of the servo motor and
spindle motor are within a predetermined speed range, using two
CPUs in redundant mode. If a speed exceeding the range is detected,
the system judges that an abnormal event has occurred.