What You Must Consider When Creating The Circuit Diagram - Eaton easySafety Manual

easySafety internal
IS01--u-IS02-..--Ä QS01
QS01--k
606
• to exchange easyNet data if this easySafety device
receives new read data or provides new send data (a
section "easyNet network" on page 521).
• to copy all new switching states to the process image.
The easySafety device uses a fixed process image that lasts
for the duration of a cycle. This ensures that each rung is
evaluated with the same switching states for one cycle, even
if the input signals at IS1 to IS14, for example, change their
status several times within a cycle.
What you must consider when creating the circuit
diagram
The easySafety device evaluates the circuit diagram in
segments, and from top to bottom within a segment, from
circuit diagram line 1 - n. You should therefore remember
two points when you create your circuit diagrams.
• 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 IS01 and IS02 are switched on.
QS01 is switched off.
This is the circuit diagram of a self-latching circuit. If IS01
and IS02 are closed, the switching state of relay coil
is "latched" via contact
QS01
1 st cycle: Inputs IS01 and IS02 are switched on. Coil QS01
picks up.
Switching contact
QS01
device processes the circuit diagram segment for segment
from top to bottom and from left to right from the first
segment. By the time the easySafety device refreshes the
process image of the outputs and therefore the coil field with
02/16 MN05013001Z EN
.
QS01
remains off because the easySafety
Ä