These are some examples of typical devices and conditions that can be monitored and used to trigger messages or alarms:
HOISTS-
Geared limit switches.
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Gravity operated limit switches.
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Wire rope guide limit switches.
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Weight overload limits and scale systems.
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Motor thermal switches.
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Brake answer-back switches.
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Motor thermal overload relays.
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Hoisting or lowering in progress.
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Hoist brake condition (brake slip or brake failure).
TRAVEL MOTIONS
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Slow down and stop limit switches.
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Motor thermal switches.
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Motor overload relays.
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Travel announcements (direction, load overhead, etc.)
VARIABLE FREQUENCY DRIVES and PLC CONTROLLERS