
3.SAFETY FUNCTIONS B-63494EN/02
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Programmable safe-related I/O signals
For use by the machine tool builder for an arbitrary purpose, 16 points
of input signals and 8 points of output signals are available. These
signals are monitored in dual mode. By using the C language executor
and the PMC ladder function, logic for handling these signals can be
developed by the machine tool builder.
With this function, Dual Check Safety can be applied in a flexible
manner to a machine that has two or more protective doors and a
complex signal system.
CAUTION
1 The FSSB I/O module is not used with tool post 2
of a 1-CPU 2-path machine and tool post 3 of a
2-CPU 3-path machine, so that the programmable
safe-related I/O signals are not applicable to these
tool posts.
2 This function is not applied to the Series 21i-B
(PMC-SA1) and loader control.
Safety position switch
Two CPUs, namely, the CNC CPU and monitor CPU, monitor the
position independently of each other, and output a signal (safety
position switch signal) via two paths according to the position set in
the safety parameter. The dual check safety function checks the state
of the safety position switch signal sent via each of the two paths. If
an error is detected, the independent CPUs immediately shut off
power to the motor drive circuit.
CAUTION
1 The machine position monitored by this function is
not a specified position but an actual position
(position determined from feedback data sent from
the position detector). So, this function cannot be
used with a machine based on a nonlinear link
feature.
2 This function is not applied to the Series 21i-B
(PMC-SA1) and loader control.