I am trying to control 5 heaters independently through PWM of stand alone SSRs with feedback from five sensors (RTD or Thermocouple) and need to detemine which modules I need with a Cdaq. I have a cdaq 9172, modules ni9211, ni9472, ni9485, and ni9481 from a previous job that I was hoping to use. My thought was to use the 9472 to modulate the standalone ssr's based on the temperatures read from the 9211. As I wrote the code and began testing/invetigating I ran into some problems. I'm not sure the cdaq can support 5 seperate PWMs and am thinking the 9211 is slowing the system down. Can anyone offer any input?