OK to mix 'of connection to the switch"and"close relay switch?

Hi all

I'm developing a test sequence using the card multiplexer 2527 to the track signals.  To configure the card, I use DAQmx switch functions.  In my application, I have a Subvi routine that imports the data from a spreadsheet Setup and run a loop for to set the configuration for each step (each iteration of the loop contains the channel for 2527 card information).  The topology is set on the first iteration, as well as the configuration of the path to the first string.

My concern is this: I need to close the extra channels/relays without changing the topology or resetting the device.  In the first round, I use "connection to the switch" function to set the initial path, (ch0 to com0 for example).  Then in subsequent iterations of the loop, I use "Relay close switch" function to close the additional channels individually (for example k2).  In the end, when the measure is taken, both ch0 ch2 must be closed and routed to com0.  This implementation is so sure, or am I somehow to make the adjustments to the initial loop?

I would like to test this with the hardware, but it is not yet available.

Also, I realize that I could use independent topology and configure all relays individually for each step, but I hope that my approach will be easier and safer.

Please notify.  Thank you.

GSinMN

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Hello GSinMN,

It's OK to mix 'of connection to the switch"and"Close relay switch"If you understand what's happening below. "Switch Connect" connects two channels by closing a path of relay between the channels, then "Close relay switch" can be used to change the State of the individual relays. If you are not careful you can mess up your connection by activating / deactivating relays that are part of the route connecting your channels.

"Also, I realize that I could use independent topology and configure all relays individually for each step, but I hope that my approach will be easier and safer."

I would recommend the topology independent if you want to stick with connections to channels only. http://zone.NI.com/reference/en-XX/help/375472G-01/switch/2527_independent/

Initial connection:

CH0-> pcom0

pcom0plus-> icom0plus

pcom0minus-> icom0minus

icom0-> com0

In each future iteration just connect to the next to pcom0 channel (which will be indirectly connect it to com0):

CH1-> pcom0

CH2-> pcom0

...

...

Jarrod

Tags: NI Products

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