Rockwell Automation 1760-xxxx Pico Controller User Manual - Manual (Page 159)

Publication 1760-UM001D-EN-P - September 2005
Retention 7-9
Examples
On-Delayed, Switching On-Delayed with Random Range, Retentive
Task 1 (On-Delayed):
A motor must start up 30 seconds after an enable signal is given.
This task is implemented using an input device which retains its '1'
state on power-up.
Contacts and relays used:
Signal diagram:
U = Supply voltage
I1 must be activated when the power is turned back on.
Task 2
A conveyor belt is to be run empty. This no-load running is
implemented by using a time relay to keep the belt running following
the STOP BELT command until the preset time has elapsed. If this
procedure is interrupted by an interruption of power, the belt is only
permitted to run empty after power-up for the remainder of the preset
time period. This task is implemented using retentive markers.
Coil Function
I1 Motor Enable
Q2 Motor
T8 Delay time
I1---------TT8
T8------{Q2 30.00
TRG
RES
X
S
{ T8
+
Circuit Diagram: Parameter Display:
t + t = 30s
U
I1
T8
t
1
t
2 1 2