Abelko IMSE WebMaster Pro User Manual
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Contents
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5375- Sensors and actuators5�5 Digital sensors5�5�1 Digital statusA digital status input does not provide so many options. All you can do is invert the signal. An inputnormally has the value 1 = On if it is connected to earth or if the input voltage is low (< 6 V). If it isopen (not connected) or if the input voltage is high (> 6 V) it has the value 0 = Off�If you select the Inverted option, On and Off are swapped around. This is usually done if an activesensor is connected. You can use all eight digital inputs on the WMPro as digital status inputs.5�5�2 FrequencySome sensors supply pulses to represent a measured quantity such as a flow. The WMPro measuresthe frequency in Hz, which then has to be converted into the relevant unit. Digital inputs 1– 4 canmeasure frequency.The WMPro can help you calculate a scale factor for most situations. Start by selecting the box nextto the quantity you are measuring. We are measuring a flow of water in this example, so select Flow.You need to complete two fields on the same line – these fields are white and the other fields arethe same colour as the background.Consult the sensor documentation to find the value for the "Each pulse represents" field. (If thedocumentation states the value as pulses per litre, you will need to convert it to litres per pulse.) Usethe drop-down list box on the right to select the unit for the flow. The changes will take effect whenyou click the Apply Settings button.Power works in the same way as flow, and this option is used for energy meters with a pulse output.Select Rotation if the sensor measures the speed of rotation. Enter the number of pulses per revolu-tion and select the display unit.For Frequency, select the unit, Hz, and pulses per minute or pulses per hour.If none of the options applies to the quantity you are measuring, select General and calculate yourown conversion factor, the frequency in Hz and the unit. |
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