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Calculation of PII and PQW required for given project

Created by: AGR at: 6/22/2012 4:48 AM (7 Replies)

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6/22/2012 4:48 AM	Rate (0)
AGR Experienced Member Joined: 9/29/2009 Last visit: 3/4/2020 Posts: 43 Rating: (1)	Hi, can someone help me with Calculation of PII and PQW required for given project. How shall we come to know the input and output areas are sufficient. And If we are using CP then how to assign the PII AND PQW Thanks for your help Thanks and Regards, AGR

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6/24/2012 9:06 AM	Rate (0)
Aret Posts: 2348 Rating: (265)	Thats depends on list of signals and modules you use. These should be defined by system documentation. You can count any analog signal as 2 bytes, and discrete as 1 bool. What you get then?
Aret Posts: 2348 Rating: (265)
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6/24/2012 9:57 AM	Rate (0)
Ayman Elotaify Platinum Expert Joined: 5/28/2008 Last visit: 9/3/2025 Posts: 4522 Rating: (843)	Hello AGR, I want to add something to Aret. You have to view technical specification of the CPU. You should check that it will cover all I/Os.
	Ayman Elotaify
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6/24/2012 10:05 AM	Rate (0)
AGR Experienced Member Joined: 9/29/2009 Last visit: 3/4/2020 Posts: 43 Rating: (1)	Thanks to both of you. I got a pop up from step 7 hw config when i tried to increase the area of the PII AND PQW of CPU as below: The CP addresses have to be outside the CPU addresses. I also have one DP DP Coupler for which i had to cover the PII and PQW area for DP DP coupler within the CPU. But why the CP addresses have to be outside the CPU PII and PQW addresses ? Can u please let me know. Thanks and Regards, AGR

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6/24/2012 10:53 AM	Rate (0)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 9/14/2025 Posts: 3049 Rating: (1062)	AGR But why the CP addresses have to be outside the CPU PII and PQW addresses ? Hello AGR it's just the way it is and could possibly be only answered by the Siemens Developers. I can tell you though that the 16 Bytes of I/O that each CP occupies in a 300 is used as the communications channelbetween the CPU and the CP and accessed by the standard communication FC's and FB's for that CP (note that these 16Bytes have nothing to do with the amount of datathat you can send/receive via a CP). Simply give your CP's a higher start address(considering the maximum address that your CPU can have) and then expand the PII and PIQ to suit your needs. I hope this helps
	Cheers fritz The advice and opinion given in this thread is that of the author and does not necessarily reflect the views of I S Systems Pty Limited. To find out how I S Systems can help you with your automation needs please visit www.issystems.com.au.
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6/24/2012 12:27 PM	Rate (0)
AGR Experienced Member Joined: 9/29/2009 Last visit: 3/4/2020 Posts: 43 Rating: (1)	Hi fritz, Thanks for your reply. I have one doubt that does the CP PII & PQW areabe covered by CPU PII & PQW area? Yes or No ? Thanks once again With Regards, Ankush

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6/25/2012 9:10 AM	Rate (0)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 9/14/2025 Posts: 3049 Rating: (1062)	AGR ... does the CP PII & PQW areabe covered by CPU PII & PQW area? Yes or No ? Hello AGR I fear I don't really understand your question but can tell you this much: A 300 CP occupiesI/O addresses. These I/O addresses MUST be outside of the CPU's I/O Process Image. These I/O addresses must however (somewhat obviously) fall inside the CPU's overall I/O address area. Example:A 6ES7315-2EH14-0AB0has a max I/O address area of 2048 Bytes. Let's say you set it's I/O Process Image size to 1024. Result: The lowest I/O address you can set for your CP is 1024 and the highest is 2032. I hope this helps
	Cheers fritz The advice and opinion given in this thread is that of the author and does not necessarily reflect the views of I S Systems Pty Limited. To find out how I S Systems can help you with your automation needs please visit www.issystems.com.au.
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6/25/2012 11:46 AM	Rate (0)
AGR Experienced Member Joined: 9/29/2009 Last visit: 3/4/2020 Posts: 43 Rating: (1)	Hi Fritz, Thanks alot ! i understood exactly what you said! Thanks i got answer of my question! Thanks and Regards, AGR

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