9477 update rate

Hello,

I have a cDAQ 8184 chassis with a 9477 sinking DO module. In the specification stands: Update Rate = 8µs.

Now my question, what does it mean? I have to switch die outputs in a resolution of 1ms, but the fastest way currently is around 50ms !

I create a DO task for one channel, and toggle it in a while loop without any delay, calling the DAQmx Write (Digital Bool 1Line 1Point).vi. I can't get it faster as 50ms.

Is the update rate of 8µs relevant only with usage of a cRIO chassis?