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Scan time and CPU

Created by: Omer Ron at: 11/28/2016 8:37 AM (2 Replies)

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11/28/2016 8:37 AM	Rate (0)
Omer Ron Bronze Member Joined: 1/21/2014 Last visit: 4/28/2020 Posts: 64 Rating: (2)	According to the tech data attached, is it reasonable to assume that CPU 1516 will have a shorter scan time by 75% than CPU 1513? Thanks... Attachment s7-1500_techn_data_cpu_en.pdf (83 Downloads)

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11/28/2016 8:49 AM	Rate (0)
mopS04 Platinum Expert Joined: 3/5/2014 Last visit: 4/13/2021 Posts: 4366 Rating: (836)	hi Omer, is this a question? I think you mean cycle-time. Yes, the CPU 1516 is much faster in bit operation times, and so it faster in whole cycle time with the same code. Cycle time can also depend on the FW-version in the CPU. We had a FW-update on one 1516 to V2.0. The cycle-time decreases on almost 40%. hope this helps, regards,
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11/28/2016 9:20 AM	Rate (0)
Omer Ron Bronze Member Joined: 1/21/2014 Last visit: 4/28/2020 Posts: 64 Rating: (2)	Thanks for the response... What I meant to ask is if there are other factor that affect the cycle time except the execution time that mention in the tech data. From your answer, I understand that there are other significant factors. I'm thinking about replacing my S7-1513 because I want to improve the cycle time (assuming that the code is efficient). Now I wonder if the S7-1516 will give me at least a 3 time faster cycle. It will be very disappointing to spend this money for a 10%-20% faster cycle. I wanted to hear from people who've done it before if they got the results that they wished for...

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