Rockwell Automation 1760-xxxx Pico Controller User Manual - Manual (Page 161)

Publication 1760-UM001D-EN-P - September 2005
Retention 7-11
Off-Delayed, Off-Delayed Switching with Random Time Range, Retentive
Task:
No-load running of a conveyor belt. (Same as the previous example
except implemented using an off-delay timer)
Contacts and relays used:
I2 and I3 are converted to one-shot pulses by T6/T7. Only the
actuation of the push-button is recognized. In the above example, T7
does not have to be retentive.
Signal diagram:
U = Supply voltage
Coil Function
T6/T7 Single pulse
I2 Start conveyor belt
Q1 Conveyor belt motor
I3 Stop conveyor belt
M16 Stop selected
T8 Remaining time
I2---------TT6
T6-T8------SQ1
M16
I3---------TT7
T7--------SM16
M16---------TT8
T8---------RQ1
RM16
30.00
TRG
RES
S
{ T8
+
Circuit Diagram: Parameters Entered:
Time setting for T6, T7
U
I2/T6
Q1
I3
M16
t
1
t
2
T8
t + t = 30s
1 2