Eaton PROFIBUS-DP EZ204-DP User Manual Page 235

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For more information visit: www.EatonElectrical.com 231MN05013003E
6Inside EZ
EZ 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 EZ 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 EZ circuit
diagram is processed cyclically every 2 to 40 ms.
During this time, EZ passes through five segments in
succession.
How EZ evaluates the circuit diagram:
In the first three segments EZ evaluates the contact fields in
succession. As it does so, EZ 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, EZ assigns the new switching states to
all the coils in one pass.
Rungs Segment
123 45
1
2
3
4
I1-q1-j--ÄQ8
I1-I4-Ö1-TT2
I2-I3----RT2
T2-u-----ÄQ1
P1-kêê êêê
EZ500_700.book Page 231 Tuesday, May 3, 2005 5:15 PM
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