I am trying to build a system that used multiple simultaneous pulse with signals to provide a throttle input to an engine. The engine requires that the duty cycle of the second signal be 50% of whatever the duty cycle of the first signal is. The duty cycle of the first cycle is related to a 0 to 4 V analog signal from a test cell control system.
I initially tried to set it up running a 9482 module in a cDAQ-9174 chassis and using the ctr0 and ctr1 channels on the module. The software was setup to divide the duty cycle setting to ctr0 by 2 for the ctr1 duty cycle input. The problem I ran into is that when I ran the system, the duty cycles on both channels were the same. I thought that maybe it was not possible to have multiple duty cycles simultaneously on a single module, so I went to two 9482 modules in the same chassis. The result was the same. When I put one module in a separate chassis I was able to get two different pulse duty cycles at the same time.
Is there a limitation in the cDAQ chassis that prevents multiple duty cycle settings? For timing I am using the DAQ MX Timing vi set to implicit.
Thank you,
Andy
