Emerson FB3000 RTU Instruction Manual
D301851X012
May 2022
I/O Configuration and Wiring
39
Type
Number Supported
Characteristics
Can be configured to fail either at last
good output value or as a preset value.
3.2.1
AO Wiring
Figure 3-3
shows how to wire the analog output.
In the figure, AO_1 is configured for current output mode and is shown connected to an
external current field device. AO_2 is configured for voltage output mode and is shown
connected to an external voltage field device. AO_1 has a dedicated ISO_GND (pin 12);
AO_2 has a dedicated ISO_GND (pin 14).
Figure 3-3: Analog Output (AO) Wiring
Both AO channels are read back to check the health of the AO:
Current outputs with loads are verified to be within the operating range of the
output.
Voltage outputs are verified to be within 10% of programmed values.
The firmware reports an open on a current output as an overrange AO.
The firmware reports a short on either a current or voltage output as an underrange
output.
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