Rockwell Automation 1760-xxxx Pico Controller User Manual - Manual (Page 162)

Publication 1760-UM001D-EN-P - September 2005
7-12 Retention
Single-Pulse Timing Relays, Retentive
Single-pulse timing relays are suitable for metering adhesives, liquids
etc.
Task: A lubricating device is to always dispense the same quantity of
oil.
Contacts and relays used:
Signal diagram:
U = Supply voltage
Range A: In this case, the power is interrupted. When power is
restored, the output stays on for the remaining time.
Range B: The time period expires without interruption.
Coil Function
I1 Start lubrication
Q1 Oil valve
T8 Oil time
30.00
TRG
RES
T8
+
{
S
I1---------TT8
T8---------{Q1
Circuit Diagram: Parameters entered:
U
I1
T8
t
1
t
2
Q1
t
A B
t + t = 30s
1 2