# Gathering process data using a channeldata node

You can gather input process data from the u-control system bus and inject it into a flow.

Using multiple data-handling nodes with small polling intervals may overburden the CPU and slow down the device. Whenever possible, use only one node to handle all data and modify the data using other nodes.

1. Open Node-RED.
2. Add a channeldata node from the Weidmüller category to the workspace.
3. Double-click the channeldata node to open the Edit node dialogue.
4. In the Polling frame, specify the polling interval by entering a value in the text box and selecting a unit from the drop-down list.

5. Specify polling intervals as large as possible to reduce CPU load.

6. If you want to emit the process data as a flat list instead of a nested list, enable the emit flat list of symbols check box.
7. Click Done to apply your changes.
8. Add more nodes to the workspace and connect them to a flow with the channeldata node being the first node.