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To make a PLC fail-safe the system does not require energization to stop the drives associated. For example, usually, an emergency stop is a normally closed contact. In the event of a power failure this would remove the power directly from the coil and also the PLC input. Hence, a fail-safe system.
So, if an action is called for, and you don't have to time to analyze the situation to a proper degrees, then fail safe: Don't do the action. Let someone with more time or patience handle it. If an action must be done, then fail safe: Don't delete the article. Close as or "no action, insufficient resources to properly adjudicate the request".
A system that is designed to fail safe, or fail-secure, or fail gracefully, whether it functions at a reduced level or fails completely, does so in a way that protects people, property, or data from injury, damage, intrusion, or disclosure.
Fail-safe systems become safe when they cannot operate. Many medical systems fall into this category. For example, an infusion pump can fail, and as long as it alerts the nurse and ceases pumping, it will not threaten the loss of life because its safety interval is long enough to permit a human response. In a similar vein, an industrial or ...
Mike Antonucci’s Union Report appears most Wednesdays; see the full archive. The Chicago Teachers Union decided last week to cease in-person schooling until a variety of conditions were met. In ...
In engineering and systems theory, redundancy is the intentional duplication of critical components or functions of a system with the goal of increasing reliability of the system, usually in the form of a backup or fail-safe, or to improve actual system performance, such as in the case of GNSS receivers, or multi-threaded computer processing.
But it does mean the way it was caught likely resulted in the death or maiming of at least one dolphin. Is the "dolphin-safe" law actually making a difference? It's complicated.
One of the most common fail-safe systems is the overflow tube in baths and kitchen sinks. If the valve sticks open, rather than causing an overflow and damage, the tank spills into an overflow. Another common example is that in an elevator the cable supporting the car keeps spring-loaded brakes open. If the cable breaks, the brakes grab rails ...