ION 7500 / ION 7600 User’s Guide

Setting Analog Zero and Full Scale Values

 

 

Determining the Zero Scale setting for output ranges below zero

To determine the Zero Scale setting for any range of output (e.g. -1000 W to 1000 W) use the Zero Scale multiplier to calculate the portion of the entire range that falls below the lowest expected value. When you subtract this portion of the range from the lowest expected value the result is entered as the Zero Scale setting:

ZeroScaleValue = MinimumValue – ZeroScaleMultiplier(Maximum – Minimum)

For example, assume the output type is 0 to 20 mA, the desired range is 4 to 20 mA, and the minimum and maximum expected values are -1000 W and 1000 W:

–1500 = – 1000W – 0.25(1000W – (–1000W))

Enter -1500 in the Zero Scale register. When the value drops to its lowest expected value of -1000 W the current output is 4 mA as illustrated below:

-1500 W

0mA

-1000 W

4mA

1000 W

20mA

Digital and Analog I/O Technical Note

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Multi-Tech Systems 7500, 7600 manual 1500 W 0mA 1000 W 4mA 20mA
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7500, 7600 specifications

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