Table Of Contents

FieldDAQ Physical Channels

Last Modified: November 16, 2017

In physical channel names, FieldDAQ1-Bank1 is the default device name for FieldDAQ. You can change these names in MAX.

FieldDAQ devices include the FD-11603, FD-11613, and FD-11637.

Analog Input

The following table lists the number and naming of analog input physical channels for FieldDAQ devices.

Device Number of Channels Naming
FD-11603 8 FieldDAQ1-Bank1/ai0 to FieldDAQ1-Bank1/ai3

FieldDAQ1-Bank2/ai0 to FieldDAQ1-Bank2/ai3

FD-11613 8 FieldDAQ1-Bank1/ai0 to FieldDAQ1-Bank1/ai7
FD-11637 8 FieldDAQ1-Bank1/ai0 to FieldDAQ1-Bank1/ai3

FieldDAQ1-Bank2/ai0 to FieldDAQ1-Bank2/ai3

Strain and Wheatstone Bridge Measurements FD-11637

The FD-11617 supports only the AI Strain Gage, AI Rosette Strain Gage, AI Force Bridge, AI Pressure Bridge, AI Torque Bridge, AI Bridge (V/V), and AI Custom Voltage With Excitation channel types.

When using the FD-11637 with an AI Custom Voltage With Excitation channel, you must set the AI.Excit.UseForScaling attribute/property to true. This attribute/property causes the channel to return ratiometric data: Vin/Vex.

The FD-11637 returns a voltage ratio rather than a voltage. Therefore, use the AI.Bridge.InitialRatio attribute/property to specify the initial voltage ratio, or set the AI.Bridge.InitialVoltage attribute/property to the ratio Vin/Vex returned by the device, multiplied by Vex.

When the FD-11637 is in quarter bridge mode, you need to use the AI.Bridge.NomResistance attribute/property to control whether the channel uses the 120 Ω range or the 350 Ω range.

The FD-11637 has an internal full bridge, half-bridge, and quarter-bridge.


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