Decentral Peripherie

Use of SFC 12 'D_ACT_DP' together with FB125

Erstellt von Import-User-1 am 29.08.2005 15:35 (2 Antworten)

  29.08.2005, 15:35

Import-User-1 Beigetreten am: 10.08.2005 Letzter Besuch: 15.05.2013 Beiträge: 3031 Bewertung:  (17)	(0)  Is there any way to stop the FB125 "DP Diagnostic" of reporting the DP nodes that I have deactivated with SFC12 as missing? Regards Johan
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  29.08.2005, 15:36

Import-User-2 Beigetreten am: 10.08.2005 Letzter Besuch: 13.12.2012 Beiträge: 1471 Bewertung:  (21)	(0)  WHAT IS PERIPHERAL I/O AND WHEN I NEED TO USE AND HOW TO PUT ADRESSES FOR IT ?
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  29.08.2005, 15:36

Import-User-2 Beigetreten am: 10.08.2005 Letzter Besuch: 13.12.2012 Beiträge: 1471 Bewertung:  (21)

(0)  Peripheral I/O refers to analog values connected to your (analog)input and output cards. They are accesed as PQWxxx and PIWxxx addresses. Digital I/Os are accessesd as IDxxx/IWxxx/IBxxx/Ix.x or QDxxx/QWxxx/QBxxx/Qx.x addresses. Furthermore, the values do not come directly from the didital module connectors; they are loaded to an input image table at every scan (for outputs, these are written from the output image table at every scan). so if the value of a digital input is read by the program, it is the value it had when it was written to the input table that is used for logic; if it has changes in the meantime, the change will not be seen by the program until next scan. Analog I/Os on the other hand are read from the periphery at the request of the program. They are "immediate reads or writes". When the program needs an analog value, it accesses the analog module, reads in the present value (and converts it) then uses that value in its logic. Hope this helps, Daniel Chartier === Edited by CS Moderator @ 10/12/2005 1:42 PM [GMT ] ===

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