Emerson FB2100 Flow Computer Instruction Manual
D301783X012
March 2019
I/O Configuration and Wiring
61
3.1
Analog Inputs
The FB2100 flow computer with CPU option 2 includes two on-board channels that you can
individually configure as analog inputs (AI) or analog outputs (AO).
Note
No external resistor is required for a current (mA) device. You can apply a 250 ohm resistor using
analog input configuration selections in FBxConnect.
When configured as analog inputs, the channels have the following characteristics:
Table 3-1. Analog Input Characteristics
Type
Number Supported
Characteristics
Analog
Input (AI)
0 to 2 as follows under CPU option 2 only:
▪
1 or 2 non-isolated channels on CPU
board (AI/AO1 and AI/AO2) always
present. You can configure one, both,
or neither as AIs.
▪
4 to 20 mA range (@24Vdc), or 1 to
5Vdc
▪
Over range for calibration purposes: 3.2
to 20.8 mA or 0.8 to 5.2 Vdc
▪
Externally powered (current mode only)
▪
Factory calibrated (re-calibration is
unnecessary for at least 3 years)
▪
Signal conditioning
▪
When you configure a channel as an AI it
cannot be used as an AO
3.1.1
AI Wiring
The diagram below shows how to wire the analog input.