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2. Limit switch - Wikipedia

   en.wikipedia.org/wiki/Limit_switch

   In electrical engineering, a limit switch is a switch operated by the motion of a machine part or the presence of an object. A limit switch can be used for controlling machinery as part of a control system , as a safety interlock , or as a counter enumerating objects passing a point.

3. Level sensor - Wikipedia

   en.wikipedia.org/wiki/Level_sensor

   Conductive level sensors are ideal for the point level detection of a wide range of conductive liquids such as water, and is especially well suited for highly corrosive liquids such as caustic soda, hydrochloric acid, nitric acid, ferric chloride, and similar liquids. For those conductive liquids that are corrosive, the sensor's electrodes need ...

4. Multi-Point Interface - Wikipedia

   en.wikipedia.org/wiki/Multi-Point_Interface

   The Multi-Point Interface – Siemens (MPI) is a proprietary interface of the programmable logic controller SIMATIC S7 of the company Siemens. [1] It is used for connecting the stations programming (PC or personal computer), operator consoles, and other devices in the SIMATIC family. This technology has inspired the development of protocol ...

5. Industrial control system - Wikipedia

   en.wikipedia.org/wiki/Industrial_control_system

   A feedback control loop is directly controlled by the RTU or PLC, but the SCADA software monitors the overall performance of the loop. For example, a PLC may control the flow of cooling water through part of an industrial process to a set point level, but the SCADA system software will allow operators to change the set points for the flow.

6. Railroad switch - Wikipedia

   en.wikipedia.org/wiki/Railroad_switch

   A right-hand railroad switch with point indicator pointing to right Animated diagram of a right-hand railroad switch. Rail track A divides into two: track B (the straight track) and track C (the diverging track); note that the green line represents direction of travel only, the black lines represent fixed portions of track, and the red lines depict the moving components.

7. Hiccups are common and usually harmless. But they can ... - AOL

   www.aol.com/hiccups-common-usually-harmless...

   "Most people experience hiccups at some point in their life," explains Dr. Christopher Pullins, a family medicine physician with Mayo Clinic. "But the frequency and severity of them vary among ...