Emerson FB1200 Flow Computer Instruction Manual
D301782X012
March 2019
I/O Configuration and Wiring 59
3.2 Analog Outputs
The flow computer includes two on-board channels you can individually configure as either analog
outputs (AO) or analog inputs. In addition, if you purchased the optional 6-channel expansion I/O
board, there are two additional channels you can individually configure as either AOs or AIs.
When configured as analog outputs, the channels have the following characteristics:
Table 3-2: Analog Output Characteristics
0 to 4 as follows:
▪
1 or 2 non-isolated channels on CPU
board (AIAO1 and AIAO2) always
present. You can configure one, both,
or neither as AOs. Note: If you
configure both as AOs we recommend
you provide isolation to avoid ground
loops which could affect readings.
▪
1 or 2 additional non-isolated channels
on optional 6-channel expansion I/O
board (AIAO3 and AIAO4). If present
you can configure one, both, or neither
as AOs.
▪
4 to 20 mA range (@24Vdc)
▪
Externally powered field device
(AIAO1/AIAO2)
▪
AO provides current to power field
device (AIAO3/ AIAO4)
▪
AO sinks current to system ground
▪
Factory calibrated (re-calibration is
unnecessary for at least 3 years)
▪
You can configure a fail state so that
on power up or if the CPU fails the
output drives to 0 µA
▪
When a channel is configured as an
AO it cannot be used as an AI
3.2.1 AO Wiring
Wire analog outputs as shown in the following figures.
Note
Figure 3-9 shows analog output wiring for AIAO1. AIAO1 and AIAO2 share the same GND terminal.
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