Analog Inputs (3Mix12/3Msg12); Analog Input Characteristics - Emerson FB3000 Instruction Manual

Emerson FB3000 RTU Instruction Manual
D301851X012
October 2022
3.1.1

Analog Inputs (3MIX12/3MSG12)

The 12-channel mixed I/O module includes eight channels you can individually configure as either
analog inputs (AI), digital inputs (DI) or pulse inputs (PI).
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 (12- Channel Mixed I/O Module0
Type
Analog
Input (AI)
Figure 3-1
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.
38
Number
Supported
Any of AIDIPI_01
through
AIDIPI_08 can be
individually
configured as
analog inputs.
shows how to wire the analog input using either 1-5V or 4-20mA.
Characteristics
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.
I/O Configuration and Wiring