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Retentive word value in LOGO

Created by: akifbilen at: 12/12/2018 11:29 AM (10 Replies)

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12/12/2018 11:29 AM	Rate (0)
akifbilen Regular Member Joined: 7/24/2017 Last visit: 6/11/2025 Posts: 8 Rating: (0)	Hello, I use Logo 8 OBA8. How can i set temperature value as retentive. I will enter any value for set temp value and the logo power off/on the value that i enter before keep retentive. Is there any way to do it? Thanks.

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12/12/2018 11:33 AM	Rate (0)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 1/15/2026 Posts: 36457 Rating: (4549)	Use mathematic instruction. If you enter the value via display, the value would be saved in a flash Memory.

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12/12/2018 11:47 AM	Rate (0)
akifbilen Regular Member Joined: 7/24/2017 Last visit: 6/11/2025 Posts: 8 Rating: (0)	Can you explain more? I will enter a value using "Network Analog Input" tool. For example NAI1(VW4). I want to keep retentive in VW4 data area. How can i do this using Mathematic Instruction?

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12/12/2018 11:49 AM	Rate (0)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 1/15/2026 Posts: 36457 Rating: (4549)	I must just go out of office. Later i will give you an example.

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12/12/2018 12:08 PM	Rate (0)
akifbilen Regular Member Joined: 7/24/2017 Last visit: 6/11/2025 Posts: 8 Rating: (0)	Thank you. I'm waiting your solution.

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12/12/2018 1:37 PM	Rate (0)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 1/15/2026 Posts: 36457 Rating: (4549)	In your first post you don't wrote that the value came over network input. My first was when the value came from the display. Values from network goes over VM area. If you start the LOGO!, the VM area is empty. That is the reason why after starting the LOGO! have no values. Can you give me more information? Where does the value come from? Can the value also be set to 0?

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12/12/2018 3:25 PM	Rate (0)
akifbilen Regular Member Joined: 7/24/2017 Last visit: 6/11/2025 Posts: 8 Rating: (0)	I'll give you more detail about my Project. I can read/write only VM data using Android App. There is temperature control in my Project. Because of that, i need enter set temperature that i can change it anyytime. Therefore the set temp must be in retentive memory. In summary, Using my android app i will enter set temp writing on VM data and somehow the set temp value must be retentive. (somehow?)This is the point that i need.

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12/12/2018 3:30 PM	Rate (0)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 1/15/2026 Posts: 36457 Rating: (4549)	One of my questions was: Will you set the temperature value to 0? Or negative?

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This contribution was helpful to 1 thankful Users #dP

12/12/2018 3:58 PM	Rate (0)
akifbilen Regular Member Joined: 7/24/2017 Last visit: 6/11/2025 Posts: 8 Rating: (0)	No. The set temperature will be between +10 and +30.

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12/12/2018 4:12 PM	Rate (1)
ixo65 Grandmaster Joined: 12/18/2014 Last visit: 1/15/2026 Posts: 36457 Rating: (4549)	In the attachment a possible solution. The setpoint from the HMI (or App) is polled to see if it is opposite the last stored setpoint. If so, then the current setpoint is stored. But only if the setpoint is greater than 0, because the value in the VM area of the LOGO! at restart is 0. Attachment Storing_Setpoint_from_HMI_Fail-safe_in_LOGO!_(automatically)_FS4.zip (962 Downloads)

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