Re: [foxboro] IOC Explanation

Hi,
 
The B0193AX document for the ECB1 and AIN block (for example) gives the 
optional integration periods for converting the mA signal to a digital value.   
The default is 1/2 second.  The IO processor integrates the value of the mA 
over 25 milli-seconds, then it adds these 20 values, computes the average and 
stores the value. If the AIN is also on 1/2 second period, this value ends up 
in the .PNT parameter if there is no other arithmetic done by the AIN. With 
this method, every change in the mA has some affect on the value in .PNT.  This 
prevents the nasty aliasing of signals that some data gathering techniques 
induce.
 
Hope this helps,
 
Terry
 
 
________________________________
From: foxboro-bounce@xxxxxxxxxxxxx on behalf of akat cassandra
Sent: Mon 12/29/2008 7:16 AM
To: foxboro@xxxxxxxxxxxxx
Subject: [foxboro] IOC Explanation



Hello everybody!
Do anyone have in mind any document in which I can find a description of the
IOC (I/O coprocessor)?
The only document that i found a simple reference of IOC is B0700AN, but
without any special explanation for example of the reset procedure of IOC
etc.


Thanks, regards & wishes for a better 2009!




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