2/1/2024 3:44 AM | |
Joined: 12/18/2014 Last visit: 7/15/2024 Posts: 33337 Rating: (4136)
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The analog inputs of the LOGO! and the AM2 (RTD) convert any signal, whether 0-10V, 0/4-20mA or PT into 0-1000 units. And the 1000 units must then be scaled to the physical value of the respective sensor. Depending on the measuring range of the respective sensor, an analog amplifier alone is usually sufficient. If the measuring range is like in your case (1-100 PSI), then you have to use 2 analog amplifiers or even a mathematical instruction to achieve this. There is also the problem that the LOGO! only knows integers and no floating point numbers. If you use a 4-20mA sensor, you need to consider the following: 0 mA = 0 units 4mA = 200 units 8mA = 400 units 12mA = 600 units 16 mA = 800 units 20mA = 1000 units With this type of sensor, instead of 1000 usable units, you only have 800 units because the units 0-200 are reserved for the first 4 mA. So you only have a range of 200 - 1000 units available. That's why we can't give you a general solution, it depends on the sensor. AttachmentScaling_(0BA8.Standard).zip (209 Downloads) |
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