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Understanding Digital Input and Output Modules in Control Systems

Learn about typical digital input and output modules, including user input limit, sensors, switches, and signaling devices like lights and alarms. Understand sinking and sourcing configurations for effective control.

elliott-boyle
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Understanding Digital Input and Output Modules in Control Systems

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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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