User Manual

easy Program cycle
291
08/04 AWB2528-1423GB
• The changeover of a relay coil does not change the
switching state of an associated contact until the next
cycle starts.
• Always wire forward or from top to bottom. Never work
backwards.
Example: self-latching with own contact
Start condition:
Inputs I1 and I2 are switched on.
Q1 is switched off.
This is the circuit diagram of a self-latching circuit. If I1 and
I2 are closed, the switching state of relay coil
Ä Q 01 is
“latched” via contact
Q01.
• 1st cycle: Inputs I1 and I2 are switched on. Coil Q1 picks
up.
•Contact
Q01 remains switched off since easy evaluates
from left to right. The first coil field was already passed
when easy refreshes the output image in the 6th segment.
• 2nd cycle: The self-latching now becomes active. easy
has transferred the coil states at the end of the first cycle
to contact
Q 01.
Example: Do not wire backwards
This example is shown in Section “Creating and modifying
connections”Page 106. It was used here to illustrate how
NOT to do it.
In the third rung, easy finds a connection to the second rung
in which the first contact field is empty. The output relay is
not switched.
I 01--u-I 02-..--Ä Q 01
Q 01--k
I 01----Q 04--o
z------k
h--------I 03--
L: 8 C:2 B:7688