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Copying desired i/o address to specified DB

Created by: ceenetik at: 12/6/2013 12:05 PM (1 Replies)

12/6/2013 12:05 PM	Rate (0)
ceenetik Experienced Member Joined: 5/22/2009 Last visit: 1/14/2025 Posts: 50 Rating: (3)	Hi, I'm looking for a solution that will help me test communication with a device. I need to copy a desired specified i/o area (legth 150 bytes each) (starting with e.g. I1000.0, Q1000.0) to a specified DB. so i can compare values for different devices. I know I should use either SFC20 or SFC21 but I don't know how to address my desired memory area and its' length. Also I want it to copy on a trigger that I will manually set. Any ideas ?
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12/6/2013 4:44 PM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 1/1/2026 Posts: 6891 Rating: (1368)	ceenetik Hi, I'm looking for a solution that will help me test communication with a device. I need to copy a desired specified i/o area (legth 150 bytes each) (starting with e.g. I1000.0, Q1000.0) to a specified DB. so i can compare values for different devices. I know I should use either SFC20 or SFC21 but I don't know how to address my desired memory area and its' length. Also I want it to copy on a trigger that I will manually set. Any ideas ? Hello, SFC20 is used for mass copy of data pointed by source input and copy them to target area.If you are working on peripheral addresses, using SFC20 is not possible,The alternative solution in those cases is using indirect addressing and loops(for S7-300/400).If you search the forum, you will find some discussion and STL codes for that. How do access the I/O address area indirectly and what should you watch out for when copying with the SFC20? I hope this helps you Hamid Hosseini
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