1. Digital Inputs & Outputs
Carlos Tangerino
December, 2010

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. 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. 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. Schneider Electric 5- Division - Name – Date
Control Logic
DEMAND
TIMER
TOU
AUTO
FORCE
INVERTION
OUTPUT

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. 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. Schneider Electric 8- Division - Name – Date
Digital Input Physical Interface
RAW
INPUT DEBOUNCE
FILTER
DIGITAL
INPUT
To Application
OPEN
CLOSE
T

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. 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