How to read digital Port data on NI Motion 7344

[Rockyenco]

For controlling and safety function, i want to read out the status of a digital port output.

Reading an input is no problem.

Setting the output with the MOMO.vi also works.

But doing a read on the output port, does not give a result???

Can someone advise ?

[AJost]

Hi,

To my knowledge there is no option to read back the status of a port in software, the reading function only works on digital inputs.
I would say there are 2 ways to solve it: pure HW or pure SW:
- normally the 7334 has more than enough digital I/O. You can connect the output to an input and read the input for a status check (pure HW)

- make a functional global variable (FGV) controlling the output. Inside the FGV the status is protected and you can implement a function checking for the status (pure SW)

Andreas Jost

Applications Engineer
National Instruments