7.5
Analog Inputs (Voltage or mA Current)
There are three connections per analog channel providing local power output with current limiting (PWR_RTN), IO+ signal,
and IO- signal/return as needed for each functional mode (4–20 mA, ± 5 V dc, or ± 10 V dc). The following figures provide
typical wiring options.
Note
HART is optional for all internally powered mA input modes. HART is not supported for externally powered devices.
Analog Inputs Wiring Options
Caution
Internally powered 2 or 3 wire devices use the analog output DAC set at 24 mA. While
there is no thermal derating for number of active analog outputs at ambients up to 70
°°
C (158
°°
F), it is possible for a fault condition with shorted leads to cause all power
dissipation to be within the YUAA package. In this situation, there may be thermal
alarms annunciated for the processor board.
188
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