- Learning RSLogix 5000 Programming
- Austin Scott
- 170字
- 2021-07-16 20:15:10
Safety warning – loss of control/view
The designer of any control scheme must consider the potential failure modes of control paths and, for certain critical control functions, provide a means to achieve a safe state during and after a path failure. The examples of critical control functions are emergency and over-travel stop that may include the following capabilities:
- Separate or redundant control paths must be provided for critical control functions.
- System control paths may include communication links. Consideration must be given to the implications of unanticipated transmission delays or failures of the link.
- Each implementation of a control system must be individually and thoroughly tested for proper operation before being placed into service.
- Failure to follow these instructions can result in death, serious injury, or equipment damage.
This book is not comprehensive for any systems using the given architecture. It does not absolve users of their duty to uphold the safety requirements for the equipment used in their systems or compliance with both national or international safety laws and regulations.
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