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  1. 1. Digital Inputs & Outputs Carlos Tangerino December, 2010
  2. 2. Schneider Electric 2- Division - Name – Date Basic concept ●By default, the outputs are always ON ●The control logic only turn outputs to OFF condition ●If one of the logics decides for turn the output OFF, the final state will be OFF ●One output respect the logics priorities ●One or more outputs respect the priorities among them ●Loads with same priority must use round-robin scheduling
  3. 3. Schneider Electric 3- Division - Name – Date Fixed Logic, variable Atributes ●The physical state of a control device (ex.: relay) ● Depends on the physical contacts connections or device model ● ON state means – The energy is available for this output ●Control atributes ● AUTO – Indicated if the state of an output is controlled by the system or by the user. (0=MANUAL, 1=AUTO) ● FORCE – If AUTO mode is off, this flag indicates the forced state. (0=Force OFF, 1=Force ON) ● DEMAND – Output state from the demand control logic. (0=OFF, 1=ON) ● TIMER – Output state from the time control logic (0=OFF, 1=ON) ● TOU – Output state from the time of use control logic. (0=OFF, 1=ON) ● INVERTION – Command to invert the output state (0=Not Inverted, 1=Inverted)
  4. 4. Schneider Electric 4- Division - Name – Date Control Priorities ●One output may be controlled by more than one internal logic ●The decision for a such state follow the priority list as: ● Lowest priority – Demand control – Timer control – TOU control – Bypass ● Highest priority
  5. 5. Schneider Electric 5- Division - Name – Date Control Logic DEMAND TIMER TOU AUTO FORCE INVERTION OUTPUT
  6. 6. Schneider Electric 6- Division - Name – Date Advanced Output DirectDirect TONTON TOFFTOFF Output same as input Timer ON Timer OFF T T We can create many ways to control the output. Worth it? Timers Tempo mínimo OFF Tempo mínimo ON Tempo máximo OFF Pausa após ON Pausa após OFF
  7. 7. Schneider Electric 7- Division - Name – Date Control Functions SH SL POFF PON Demand ON OFF Time SH – Setpoint High SL – Setpoint Low POFF – pause after OFF PON – Pause after ON Output
  8. 8. Schneider Electric 8- Division - Name – Date Digital Input Physical Interface RAW INPUT DEBOUNCE FILTER DIGITAL INPUT To Application OPEN CLOSE T
  9. 9. Schneider Electric 9- Division - Name – Date Digital Input Type ●Always open – Force condition ●Always close – Force condition ●Direct input – Same state as the input ●Inverted input – The state is inverted ●Count on close – Increment the counter value on close transition ●Count on open - Increment the counter value on open transition ●Count on change - Increment the counter value on any change ●Toggle – Change state on close ●The input type selection depend on the behavior of the connected device
  10. 10. Schneider Electric 10- Division - Name – Date Digital Inputs - Application ●The digital inputs can be used isolated or in group ●One isolated digital input may be used as: ● Event monitoring ● Alarm monitoring ● KYZ control (TOU, EOI) ●One or more digital inputs may be combined to interface pulse energy meters. Ex: ● Input 1 – kWh pulse - received ● Input 2 – kVArh pulse - received ● Input 3 – kWh pulse – delivered ● Input 4 – kVArh pulse – delivered ● Input 5 – EOI pulse ● Input 6 – TOU pulse (off-peak) ●Mixed mode as pulse counter and trip detection at same input