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ECT 464

ECT 464. Lecture 4a Input/Output Modules. Most men forget God all day and ask Him to remember them at night. Evening, morning and noon        I cry out in distress,        and he hears my voice. Psalm 55:17. Typical Digital Inputs. User Input Limit Proximity Temperature Flow Level

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ECT 464

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  1. ECT 464 Lecture 4a Input/Output Modules

  2. Most men forget God all day and ask Him to remember them at night. Evening, morning and noon        I cry out in distress,        and he hears my voice. Psalm 55:17

  3. Typical Digital Inputs User Input Limit Proximity Temperature Flow Level Pressure

  4. Typical Digital Outputs Lights/LED’s Solenoid Coils Alarm/Bell/Whistle Motor Relay

  5. Input Modules • AC • Opto Triac Input • DC • Opto LED either sinking or sourcing Sinking- Current flows in input and out common Sourcing- Current flows in common and out input connection.

  6. Proximity Switches • Either Sinking (NPN) or Sourcing (PNP) • Must be paired up with opposite input module logic. Sinking (NPN) – current flows in the collector from the input module and flows out the emitter to ground. The input is a low signal felt on the base of the transistor. Sourcing (PNP) – current flows in the emitter and flows out the collector to the input module. The input is a low signal felt on the base of the transistor.

  7. Output Modules • AC • Opto Triac Output • DC • Opto-transistor either sinking or sourcing Sinking- Current flows in output and out common Sourcing- Current flows in common and out output connection.

  8. Next Class • Special Functions • I/O scans and memory layout

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