Maximum Number of NI 9144 Chassis That Can Be Daisy Chained Together

Updated Apr 10, 2018

Reported In

Hardware

  • NI-9144

Driver

  • NI-Industrial Communications for EtherCAT

Issue Details

I know the NI 9144 chassis can be used in a daisy chain, namely connecting multiple chassis in series through their ethernet ports.  Is there a limit to the amount that can be connected together?

Solution

The theoretical maximum number of NI 9144 chassis that can be connected together is 65,535, as specified by the real-time Ethernet protocol.

However, the number of chassis does not matter as much as the number of I/O channels being deployed.  More I/O channels means that more data must be pushed over the network, which will slow down the scan rate of the system.  In general, the processing power of the master controller for the NI 9144 will directly impact the number of I/O channels it can handle for a given scan rate.

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