PRE-INSTALLATION
2-3
Hardware
and Installation User Manual
ICS
3–304.81 Safety Recommendations:
Consideration
should be given to the use of an emergency stop function which is
independent
of the programmable controller
.
Where
the operator is exposed to the machinery
, such
as in loading or unloading
a machine tool, or where the machine cycles automatically, consideration
should be given to the use of an electromechanical override or other redundant
means, independent of the programmable controller, for starting and
interrupting
the cycle.
If provision is required for changing programs while the equipment is in
operation, consideration should be given to the use of locks or other means of
assuring
that such changes can be made only by authorized personnel.
These recommendations are intended as safeguards against the failure of
critical
components and the effects of such failures or the inadvertent errors that
might be introduced if programs are changed while the equipment is in
operation.*
*The ICS 3–304.81 Safety Recommendations are reproduced by permission of
the National Electrical Manufacturers Association from NEMA ICS 3–304,
Programmable
Controller Standard.
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