# Compare tags over time

> Put tags of several machines on one chart in the Trend Workspace, compare them with yesterday, and save the view so you or others can open it again.

Source: https://proxus.io/docs/monitor/compare-tags

At the end of this guide you have the speed of two fillers on one time axis, compared with the same time
yesterday, saved as a view your colleagues can open.

## Before you start

- The devices store their data in the Proxus historian. A tag is listed only when it has data in the last 7 days.
- A user role that may read the devices.

## Choose the tags

1. Open **Monitor > Trend Workspace**.
2. Type part of a device or area name in **Search devices or plant areas**, for example `FILLER`.
3. Select a device to list its tags, and tick the tags to chart.
4. Do the same for the next device.

*Screenshot: The Devices panel with FILLER typed in the search box, MFB_RTM_L1_FILLER opened and its Speed tag ticked*

1. The search box.
2. The device, with the number of its tags on the chart.
3. A ticked tag. Its colour is the colour of its line.

Each tag gets its own pane on the same time axis. Up to 8 tags fit on the chart.

## Choose the time and compare

5. Choose a range: **15 min**, **1 h**, **8 h**, **24 h** or **7 days**. Use **‹** and **›** to step to earlier or
   later ranges, and **Now** to come back.
6. In **Compare**, choose **Same time yesterday** (or **Previous period**, or **Same time last week**).

*Screenshot: Two speed panes with yesterday's values as dashed grey lines and a Same time yesterday column in the table showing the change in percent*

1. **Compare** set to **Same time yesterday**.
2. The table's new column: yesterday's average and the change in percent. In the chart, yesterday is the dashed
   grey line.

Point at the chart to read the values of all panes at the same moment. Scroll inside the chart to zoom in.

## Save the view

7. Select **Save view**.
8. Enter a **View name**. Tick **Share with everyone** if others should see it in their list.
9. Select **Save**.

*Screenshot: The save form below the toolbar with the view name Filler speed, lines 1 and 2, Share with everyone ticked and the Save button*

1. **View name**. A view with the same name of yours is replaced.
2. **Share with everyone**.
3. **Save**.

The view now appears in **Saved views…**. To send the view to someone without saving it, select **Copy link** and
paste the address in a message.

## What's next

- [Export a trend](https://proxus.io/docs/monitor/export-a-trend)
- [Show machine state on a trend](https://proxus.io/docs/monitor/show-machine-state)
- [Trend Workspace](https://proxus.io/docs/monitor/trend-workspace): every control of the screen.