Rockwell Automation 1760-xxxx Pico Controller User Manual - Manual (Page 124)

Publication 1760-UM001D-EN-P - September 2005
4-64 Draw a Circuit Diagram with Pico
Definition of the contacts and relays used:
If you use Pico with a time switch, you can define both the stairwell
lighting and the continuous lighting periods via the real time clock.
If you use Pico with analog inputs, you can optimize the stairwell
lighting, via a brightness sensor to suit the lighting conditions.
Activation Effect on Lighting
Button pressed briefly Light ON or OFF.
Lights turn off automatically after 6 minutes.
Button pressed for more than 2
seconds Continuous lighting
Item Function
I1 Button ON/OFF
Q1 Output Relay for light ON/OFF
M1 Marker relay. This is used to block the ‘switch off automatically after 6
minutes’ function for continuous lighting.
T2 Scan to determine how long the button was pressed. If pressed longer than 2
seconds, switch on continuous lighting (X, on delayed, value 2 seconds).
T3 Turn lights off after the light has been switched on for 6 minutes.
T4 Turn lights off after 4 hours continuous lighting (X, on-delayed, value 4:00
hours).
I1---------TT2
T2---------SM1
I1--------- Q1
T3
Q1-M1------TT3
Q1---------RM1
I1---------TT2
T2---------SM1
I1--------- Q1
T3
T4
Q1-M1------TT3
--------TT4
Q1---------RM1
The Pico circuit diagram for the
functions described above
looks like this: The enhanced Pico circuit diagram:
after four hours, the continuous
lighting is also switched off.