5/4/2017 6:07 AM | |
Joined: 12/18/2014 Last visit: 8/21/2024 Posts: 33603 Rating:
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Since you do not describe exactly what input it is, so I can only make assumptions. Also, you have not written how high the speed is (rpm). For normal digital inputs, Siemens only guarantees a frequency of 4Hz, which corresponds to 240 rpm. For higher frequencies, you Need a LOGO! which can only be supplied with pure DC voltage. These LOGO!s have fast inputs, in which Siemens guarantees a frequency of 5kHz, which corresponds to a speed of 30,000 rpm. From these fast inputs the corresponding LOGO! has each 4 (I3-I6). Digital expansion modules do not have these fast inputs. In addition I would program the speed evaluation differently, see attachment. AttachmentSpeed_0BA8.Standard.zip (1847 Downloads) |
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5/5/2017 7:34 AM | |
Joined: 12/18/2014 Last visit: 8/21/2024 Posts: 33603 Rating:
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The precision of the display depends on the number of measured pulses, the measurement period and the factor.
For a measuring period of one second, the speed is updated every second, with a measuring period of 10 seconds, the update takes place every 10 seconds. In attachment there is a new example. In this you can for testing in the simulation changing the measuring period over TDE Display. AttachmentSpeed_V2_0BA8.Standard.zip (1383 Downloads) |
5/6/2017 6:55 PM | |
Joined: 12/18/2014 Last visit: 8/21/2024 Posts: 33603 Rating:
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Here is an example of how to calculate the speed by measuring the period between 2 signals of the speed sensor.
AttachmentSpeed.zip (1320 Downloads) |
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