Siemens SIMATIC TI525 Hardware And Installation Manual page 26

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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PRE-INSTALLATION
2-3
Hardware and Installation User Manual