Analog Outputs; Ao Wiring - Emerson FB1200 Instruction Manual
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Emerson FB1200 Flow Computer Instruction Manual
D301782X012
July 2017
3.2
Analog Outputs
The FB1200 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
Type
Analog
Output
(AO)
3.2.1
AO Wiring
Wire analog outputs as shown:
Figure 3-9:
Note: Analog output wiring for AIAO1 shown. AIAO1 and AIAO2 share same GND terminal.
56
Number Supported
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.
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.
Analog Output (AO) Wiring – (Base I/O – when optional I/O also present)
Characteristics
0 to 21 mA range (@24Vdc); (software
configured to 4 to 20 mA)
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
I/O Configuration and Wiring
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