You can see and change the most commonly changed options for each block using the icons in the block list: 
Click the Pause icon 
to pause or resume data collection for a block. The clock icon color gives important information about the state of live data collection for that block:
- Green means data is being collected successfully.
- White data collection is paused.
- Grey means stale data or that the Watch Window is trying but failing to collect data for the block (check your live data connection).
- Blue means the Watch window cannot collect data for the block, because although there are live data connection configured and running, none are supplying data for the PCU to which the block belongs.
Data collection can also be paused by clicking Pause Data Collection on the Block menu, or Pause Data Collection after right-clicking on the block in the block list.
You can also pause or unpause data for an entire group at once.
See also
- Adding a block to a group
- Adding a live loop annotation to the watch window
- Automatically generating the best range for plots in the Watch Window
- Changing plot line colors in the Watch Window
- Changing the update interval for blocks and groups in the Watch Window
- Deleting a block from the Watch Window
- Editing a block in the Watch Window
- Inverting the y-axis of plots in the Watch Window
- Managing Blocks in the Watch Window
- Rearranging blocks in the Watch Window
- Saving the current plot vertical range as the custom range
- Setting the update interval for a block in the Watch Window
- Showing/Hiding a plot line in the Watch Window
- Understanding when data points are connected with lines in trend plots
- Managing Data Collection in the Watch Window
- Pausing and unpausing data collection for entire watch groups
- Pausing data collection automatically in the Watch Window
- Setting the autopause schedule for a block
- Setting the autopause schedule for all blocks in a group
- Setting the default autopause schedule
- Setting the update interval for a block in the Watch Window
- Setting the update interval for a group of blocks in the Watch Window
- Watch Window Autopause Schedule dialog