Banner Sure Cross DX80 Instruction Manual page 27

Example: Mapping a Temperature
Map a temperature input from a Node to a 4 to 20 mA output. The starting temperature is −20 °F and the last temperature
will be 50 °F (4 mA = −20 °F, 20 mA = 50 °F). This defines the null as −20 °F and the span as 70.
With an input temperature value of −5 °F, the output value will be:
Output = (Fullscale ÷ Span)(InValue − Null) + Offset
(Fullscale ÷ Span) = 16 ÷ 70 = 0.22857
(Value − Null ) = −5 − (−20) = 15
Offset = 4
Output = 0.22857 × 15 + 4 = 7.42 mA
Example: Mapping a Distance
Map a distance input from a Node to a 0 to 10 V output. The starting distance is 200 mm and the last distance will be 2000
mm (4 mA = 200 mm and 20 mA = 2000 mm). This defines the null as 200 and the span as 1800.
With an input distance reading of 1560 mm, the output value will be:
Output = (Fullscale ÷ Span)(InValue − Null) + Offset
(Fullscale ÷ Span) = 10 ÷ 1800 = 0.00555
(Value − Null ) = 1560 − 200 = 1360
Offset = 0
Output = 0.00555 × 1360 + 0 = 7.54 V
Alarm Conditions. The standard alarm conditions are as follows:
Unsigned Alarm = 0xFFFF
Signed Alarm = 0x7FFF
If special alarm conditions are needed, consult the factory for details.
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Sure Cross Radio Networks and Host Controller Systems
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