10/30/2016 8:31 AM | |
Posts: 67 Rating:
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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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10/30/2016 9:27 AM | |
Joined: 12/18/2014 Last visit: 9/7/2024 Posts: 33709 Rating:
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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 (830 Downloads) |
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10/30/2016 11:16 AM | |
Joined: 12/18/2014 Last visit: 9/7/2024 Posts: 33709 Rating:
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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 (580 Downloads) |
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10/30/2016 11:28 AM | |
Joined: 12/18/2014 Last visit: 9/7/2024 Posts: 33709 Rating:
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Here's the next version.
AttachmentSetpoint_V3.zip (654 Downloads) |
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