To generate digital output, install a digital output C Series module in any slot on the cDAQ chassis. The generation specifications, such as the number of channels, channel configuration, update rate, and output range, are determined by the type of C Series module used. For more information, refer to the documentation included with your C Series module(s).

With parallel digital output modules (formerly known as hardware-timed modules), you can 
do multiple software-timed tasks on a single module, as well as mix hardware-timed and software-timed digital output tasks on a single module. On serial digital output modules (formerly known as static digital output modules), you cannot mix hardware-timed and software-timed tasks, but you can run multiple software-timed tasks.

You may have a hardware-timed task or a software-timed task include channels from multiple modules, but a hardware-timed task may not include a mix of channels from both parallel and serial modules.