6 Internal
6.1 circuit diagram cycle
Operating instructions 05/10 MN05013003Z-EN www.eaton.com 187
6 Internal
6.1 circuit diagram cycle
In conventional control systems, a relay or contactor control processes all the
rungs in parallel. The speed with which a contactor switches in this case
depends on the components used, and ranges from 15 to 40 ms for relay
pick-up and drop-out.
With easy the circuit diagram is processed with a microprocessor that
simulates the contacts and relays of the circuit concerned and thus
processes all switching operations considerably faster. Depending on its
size, the easy circuit diagram is processed cyclically every 2 to 40 ms.
During this time, easy passes through five segments in succession.
6.1.0.1 How evaluates the circuit diagram:
In the first three segments easy evaluates the contact fields in
succession.As it does so, easy also checks whether the contacts are
connected in parallel or series and stores the switching states of all the
contact fields.
In the fourth segment, easy assigns the new switching states to all the coils
in one pass.
The fifth segment is outside the circuit diagram and easy uses it to establish
contact to the “outside world”: The output relays Q1 to Q… are switched
and inputs I1 to I… are read again. easy also copies all the new switching
states to the status image register.
easy only uses this status image for one cycle. This ensures that each rung is
evaluated with the same switching states for one cycle, even if the input
signals at I1 to I12, for example, change their status several times within a
cycle.
Rung Segment
123 45
1
2
3
4
…
…
I1-Q1-j--ÄQ8
I1-I4-Ö1-TT2
I2-I3----RT2
T2-u-----ÄQ1
P1-k
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