User manual

Publication 1760-UM001A-EN-P
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.
Ta sk 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:
U
I1
T8
t
1
t
2
t +
1
t = 30 s
2