How Many Encoders Can I Measure with My DAQ Chassis?

Updated Sep 24, 2018

Reported In

Hardware

  • NI-9361
  • CompactDAQ Chassis
  • C Series Counter Input Module

Software

  • LabVIEW

Driver

  • NI-DAQmx

Issue Details

I want to measure multiple encoders in my system.
How many encoders can I measure with CompactDAQ Chassis?
And if there is a limit, can I expand the number of encoders in one chassis?

Solution

To measure an encoder with a CompactDAQ system, you need to be aware of the number of counters. 
Encoder measurement function provided by DAQmx API uses one counter per an encoder measurement. 
Generally an NI CompactDAQ Chassis has four built-in counters, so four encoders can be measured by single CompactDAQ chassis.

To expand the number of encoders in a single CompactDAQ system, you can use NI-9361.
NI-9361 has 8 built-in encoders in a module, and this can be used in other modules on the same chassis. 

 

Additional Information

Legacy or new product can have fewer or more counters than 4.
Check the cDAQ Chassis Specification of the model you use before calculating the number of encoders your system can measure. 

If you are not familiar with connecting encoders, check this tutorial Encoder Measurements: How-To Guide.

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