But limit switches make or break contact permanently when they are actuated.Д®lectrical relay is a switch whose contacts open or close when its coil is energised. They make or break contact only as long as they are held pressed. Push button switches are momentary switches. How does a limit switch differ from a push button switch? Temperature switches senses change in temperature and open or close contacts when a predetermined temperature is reached.ДЎ3. Pressure switches open or close contacts based on the system pressure. What is the difference between pressure switch and a temperature switch? A stepping unit is built from memory valve and a preswitched AND valve with two inputs.ДЎ2. Combinational circuit design.ДЄ step counter is a digital modular counter constructed from stepping units. Name the common methods used for designing logic circuits?ДЎ. Draw the symbol for fluidic OR element and write its truth table. (iv) Quite insensitive to temperature, vibration, shock, electric noise and radiation.ДЁ. (iii) Very little space needed for mounting. What are the advantages of fluidic elements? Fluidic elements have no mechanical moving parts.Д§. The elements use moving parts such as diaphragms, springs, disk, balls, poppets.ДЇluidics is fluid logics. These elements are available as AND, OR, NOT logic elements. The MPL elements are miniature pneumatic elements. What are moving part logic elements (MPL)? (i) Pneumatic limit valves (ii) Back pressure sensor (iii) Proximity sensor (iv) Gap sensor or Interruptible jet sensor (v) Limit switch.ДҐ. Name the different pneumatic position sensors. at any moment they can be in one of the two states. The components of logic control are sensors and switching elements called binary elements, i.e. The logic control is a control based on logic functions like AND, OR, NOT etc.

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