Emerson FB3000 Instruction Manual page 82

FB3000 RTU Instruction Manual
D301851X012
November 2023
Figure 3-16
In the figure, AO_4 is configured for current output mode and is shown connected to an
external current field device. AO_7 is configured for voltage output mode and is shown
connected to an external voltage field device.
When configured as an AO, the ground pin of each AO is tied internally to all other AOs on
the module; they share a common internal ground regardless of whether they are
configured for current mode or voltage mode.
Figure 3-16. Analog Output (AO) Wiring
AO channels are read back to check the health of the AO:
Voltage outputs are verified to be within 30% of programmed values.
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Current outputs are not verified, but the firmware reports an open on a current
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output as an overrange AO, and a short on a current output as an under-range AO.
The actual values read back are unavailable to the user and these checks are made
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internal to the firmware.
Notes on Calibrating Analog Outputs
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68
shows how to wire the analog output.
You calibrate the AO using FBxConnect software.
When calibrating the AO in voltage mode, you must calibrate each AO channel with
the actual load connected at a constant load impedance to meet performance
specifications; otherwise the calibration is invalid.
For voltage mode, the minimum load impedance driven by any AO is 1000 ohms.
I/O Configuration and Wiring