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Inside EZD
MN05013005E
388
Effects on the creation of the circuit diagram
EZD evaluates the circuit diagram in these six segments in
succession. You should take into account two factors when
creating your circuit diagram.
• 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
Q 01
.
•
1st cycle:
Inputs I1 and I2 are switched on. Coil Q1 picks
up.
• Contact
Q 01
remains switched off since EZD evaluates
from left to right. The first coil field was already passed
when EZD refreshes the output image in the 6th segment.
•
2nd cycle:
The self-latching now becomes active. EZD 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 139. It was used here to illustrate how
NOT to do it.
In the third rung, EZD 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
