Eaton PROFIBUS-DP EZ204-DP User Manual Page 194

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Wiring with EZ
MN05013003E190
Figure 77: EZ circuit diagram shift register
How does the shift register work?
The shift pulse is activated for exactly one cycle. To do this,
the shift pulse is generated by evaluating the change from I1
OFF to I1 ON – the rising edge.
In this way, therefore, the cyclical processing of EZ is used to
trigger the shift pulse.
When I1 is activated for the first time, the marker relay break
contact M7 is closed during the first pass through the cycle.
Thus, the series circuit consisting of I1, break contact M7
(closed) and M8 is activated. Although M7 is now also
activated, this does not yet have any effect on contact M7.
The contact of M8 (make contact) was still open during the
first cycle so a shift pulse cannot yet be generated. When the
relay coil M8 is activated, EZ transfers the result to the
contacts.
Generate shift pulse
Set 4th storage location
Clear 4th storage location
Set 3rd storage location
Clear 3rd storage location
Set 2nd storage location
Clear 2nd storage location
Set 1st storage location
Clear 1st storage location
Clear all storage locations
I1um7----ÄM8
h------ÄM7
M8uM3----SM4
dm3----RM4
dM2----SM3
dm2----RM3
dM1----SM2
dm1----RM2
dI2----SM1
hi2----RM1
I3------uRM1
dRM2
dRM3
hRM4
EZ500_700.book Page 190 Tuesday, May 3, 2005 5:15 PM
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