Analog Inputs Wiring Options; Analog Inputs (Voltage Or Ma Current); Geh-6855_Vol_Ii Mark Vies Functional Safety Systems Volume Ii - GE Mark VIeS System Manual

Functional safety systems for general market

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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.

GEH-6855_Vol_II

Analog Inputs Wiring Options

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.

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