4
Programming
Considerations
To conform with ICS Safety Recommendations, checks should be placed
in the controller to ensure that all writable registers that control critical
parts of plant or machinery have limit checks built into the program, with
an out-of-limit safe shut down procedure to ensure safety of personnel.
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 only authorized personnel can make such changes.
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. *
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The ICS 3-304.81 Safety Recommendations are reproduced by permission of the National Electrical
Manufacturers Association from NEMA ICS 3-304
2.3 Limited Liability Warranty
Weintek products include the isolated power supply are covered by a limited liability warranty from
defects in material and workmanship. This warranty does not apply :
(a) if, in the judgment of Weintek, the product fails due to damage from shipment, handling, storage, accident
(natural and man-mad) ;
(b) if the product fails due to misuse, including but not limit to incorrect set-up and wiring, current leakage
from machine platform and incorrect input power ;
(c) if the product has been maintained in a manner not conforming to product's instructions or has been
modified in any way,
(d) if the serial number has been defaced or removed.
