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Use of SFC 12 'D_ACT_DP' together with FB125

8/29/2005 3:35 PM	Rate (0)
Import-User-1 Posts: 3609 Rating: (29)	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
Import-User-1 Posts: 3609 Rating: (29)
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8/29/2005 3:36 PM	Rate (0)
Import-User-2 Silver Member Joined: 8/10/2005 Last visit: 4/9/2024 Posts: 1486 Rating: (32)	WHAT IS PERIPHERAL I/O AND WHEN I NEED TO USE AND HOW TO PUT ADRESSES FOR IT ?

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8/29/2005 3:36 PM	Rate (0)
Import-User-2 Silver Member Joined: 8/10/2005 Last visit: 4/9/2024 Posts: 1486 Rating: (32)	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
	Last edited by: CS Moderator at: 10/12/2005 1:42 PM
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This contribution was helpful to 1 thankful Users kylelove41

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