10/30/2016 8:31 AM | |
Posts: 67 Rating: (7) |
Hi, I want to make a little heat controller for my workshop. I've read a lot about LOGO's and temp. measurement. It looks like i would need an expansionmodule to read a PT100. However, PT100 have a large temperaturespan, which i don't need. (It will measure room temperature) I stumbled across Siemens QAA2061, which is a 0-50 C @ 0-10V, which i suppose my LOGO 8 would read? Datasheet here; Siemens QAA2061 Questions; Can I use this sensor with a LOGO8, reading it on an analog input? Can I "translate" the values to temperature some way, ie. to get a reading on a TDE? Can I make temp up and down in 0,5C increments using buttons on digital inputs. And further have a button to set a pre-defined night economy mode? Thanks in advance. |
Last edited by: cs_dk at: 10/30/2016 8:32:51 AM |
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This contribution was helpful to1 thankful Users |
10/30/2016 9:27 AM | |
Joined: 12/18/2014 Last visit: 9/20/2024 Posts: 33807 Rating: (4200)
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Your LOGO! has 4 analog inputs 0-10V. I have prepared a program for you. And you can switch via the relay outputs 230V AC. I would however in your place rather an additional relay or a solid state relay between the relay output of the LOGO! and the heater. AttachmentSetpoint.zip (834 Downloads) |
This contribution was helpful to1 thankful Users |
10/30/2016 11:16 AM | |
Joined: 12/18/2014 Last visit: 9/20/2024 Posts: 33807 Rating: (4200)
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The LOGO! converts a voltage signal 0 -10 V or a current Signal 0/4 - 20 mA into 1000 units. The second counter in the setpoint processing is required if the setpoint is to be limited downwards, e.g. The setpoint should not be less than 15 ° C. AttachmentSetpoint_V2.zip (586 Downloads) |
This contribution was helpful to2 thankful Users |
10/30/2016 11:28 AM | |
Joined: 12/18/2014 Last visit: 9/20/2024 Posts: 33807 Rating: (4200)
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Here's the next version.
AttachmentSetpoint_V3.zip (659 Downloads) |
This contribution was helpful to2 thankful Users |
10/30/2016 2:57 PM | |
Joined: 12/18/2014 Last visit: 9/20/2024 Posts: 33807 Rating: (4200)
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Look at attached screenshots of V2 and V3. AttachmentScreens.zip (341 Downloads) |
This contribution was helpful to1 thankful Users |
10/30/2016 3:41 PM | |
Posts: 67 Rating: (7) |
Shift I5 to I1, and it does not work anymore.. Can't figure out whats going on. AttachmentVarmestyring_V2.zip (365 Downloads) |
10/30/2016 4:01 PM | |
Joined: 12/18/2014 Last visit: 9/20/2024 Posts: 33807 Rating: (4200)
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You have the background lighting flags inserted into the program, that is not mine.
All functions okay, I can see any fault. Look at attached ideo. AttachmentTest.zip (335 Downloads) |
Last edited by: ixo65 at: 10/30/2016 4:02:31 PM |
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10/30/2016 4:20 PM | |
Posts: 67 Rating: (7) |
Sorry - I have inserted the flags later on.. If I use your program, the background is white without any flag? Doh.. I have figured the mystery out now, regarding I1 and I5.. The display is reading I5, and when i change it to I1, i'll have to change the display setting to. This should work. AttachmentVarmestyring_V3.zip (346 Downloads) |
Last edited by: cs_dk at: 10/30/2016 4:24:23 PM |
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11/5/2016 10:25 AM | |
Posts: 67 Rating: (7) |
I've been quite busy, so I did not go any further with this in the previous week. How ever, i have a NO switch as night/day switch - I can easily reverse it by a NOT gate. But that changes my night and day temp. selections as well. (Night changes day temp and vice versa). I can't see where excact the connection is, can you point me in the right direction? EDIT: Day temp seems to work, and starting the heater. Night however does not start the heater, even if 25C is requested. AttachmentVarmestyring_V4_Final.zip (347 Downloads) |
Last edited by: cs_dk at: 11/5/2016 10:31:18 AM |
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