Emerson FB3000 RTU Instruction Manual
D301851X012
May 2022
36
I/O Configuration and Wiring
3.1
Analog Inputs
The FB3000 RTU supports a mixed I/O module which includes eight channels you can
individually configure as either analog inputs (AI), digital inputs (DI) or pulse inputs (PI).
The number of mixed I/O modules supported depends on the number of I/O slots in the
RTU.
Note
No external resistor is required to interface with a current (4-20 mA) device. To convert a
current to a voltage to be read by the hardware analog to digital converter, when you
configure the AI for current within FBxConnect, the device enables a 250 ohm resistor
across the channel input.
When configured as analog inputs, the channels have the following characteristics:
Table 3-2: Analog Input Characteristics
Type
Number Supported
Characteristics
Analog
Input (AI)
Any of AIDIPI_01 through
AIDIPI_08 can be individually
configured as analog inputs.
4 to 20 mA range (or 1 to 5V) selectable
within FBxConnect.
Analog inputs share a common ground.
When you configure a channel as an AI it
cannot be used as a DI or PI
If current requirements are less than 200 mA
@ 24V, you can power using 24V loop supply.
3.1.1
AI Wiring
Figure 3-1
shows how to wire the analog input using either 1-5V or 4-20mA.
In the figure, AIDIPI_01 is configured as a voltage input and is shown connected to an
external voltage source.
AIDIPI_06 is configured as a current input and is shown connected to an external current
source.
Pin 5 is the ISO_GND connection for AIDIPIs 1 through 4; Pin 10 is the ISO_GND
connection for AIDIPIs 5 through 8. Pins 5 and 10 are internally connected together.
Unconnected analog inputs report an alarm condition.
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