I am trying to trigger a 9234 from a 9401 connected to a PLC. There are 4 input triggers connected to the first 4 channels of the 9401, corresponding to 4 phases of a test. For each phase of the test, I am looking for a trigger on a different channel. The problem is that the acquisition is triggered from any of the 4 input channels, i.e. when I specify a trigger on the first channel, PFI0, a trigger from PFI1, PFI2 or PFI3 also causes the acquisition to launch.
In using the NI example, “Acq&Graph Voltage-Int Clk-Dig Start.vi”, I am able to reproduce this behavior. I configure the trigger source to be PFI0, Rising Edge, on the 9401. The acquisition is triggered even if the rising edge is passed on channel 1, 2 or 3. Trigger signal level is 0-5V.
LV2011, DaqMX V9.4, Windows XP