3 - 2 WBPEEUI240751C0
Inputs and Outputs
Data Conversion
An I/O block that supports analog inputs reads currents or
voltages at its input channels, scales and converts the inputs
to real values in engineering units, then reports the input val-
ues to the Harmony controller. The block provides channel sta-
tus information along with each reported input.
High and low level inputs are converted to the proper engineer-
ing units based on input type and engineering unit high and
low value specifications. Thermocouple and RTD inputs are
converted to the proper engineering units (degrees C or degrees
F) using predefined conversion tables for each type of thermo-
couple and RTD supported.
Figure 3-1. Analog Input
T00554C
3-WIRE RTD
INT E RNAL FIEL D
POWERED
TRANSMITTER
4-20 m A
+
+
+
+
+
C
–
–
–
–
–
SINGLE-ENDED
OR
DIFFERENTIAL
VOLTAG E
V
SOURCE
±10 V OR
±100 mV
THERMOCOUPLE
EXTERNAL FIELD
POWERED
+24 VDC
4-20 mA
TRANSMITTER
COMMON
R
LEA D1
R
LEA D2
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