# Show machine state on a trend

> Set up a state band so trends show, behind the values, when a machine was running, waiting or stopped, with your own labels and colours.

Source: https://proxus.io/docs/monitor/show-machine-state

At the end of this guide, every trend of the device shows a coloured band with its state: for example green while
it runs, amber while it is blocked and red while it is in fault. The same band appears on the alarm page and in
presentation mode, which then also counts the stops.

## Before you start

- The device has a tag that holds its state as a code, for example `State` with `1` for running and `4` for fault.
  Ask the PLC programmer what each code means.
- The tag has values in the time range you look at: the form offers only the codes seen in that range.
- A user role that may change the device. The band is saved on the device, so it is the same for every user.

## Set up the band

1. Open **Monitor > Trend Workspace**.
2. Find the device in the **Devices** panel and select it.
3. Under the device name, select **Set up a state band…**.
4. In **State tag**, choose the tag that holds the state.
5. For each value in **Values seen in this range**, enter a label and choose a colour.
6. Select **Save**.

*Screenshot: The state band form for MFB_RTM_L1_FILLER with the State tag chosen and values 1, 3 and 4 labelled Running, Blocked and Fault*

1. **State tag**: the tag with the state code.
2. A value with its label and colour. Here `1` is **Running** with **Running / OK**, `3` is **Blocked** with
   **Warning** and `4` is **Fault** with **Stopped / fault**.
3. **Save**.

The colours are **Running / OK**, **Warning**, **Stopped / fault**, **Information** and **Neutral**. Choose
**Stopped / fault** only for states that mean the machine is stopped: presentation mode counts these as stops.

The band now appears above the panes of the device's tags:

*Screenshot: The trend of two filler speeds with a band above it showing Running periods in green and short blocked and fault periods*

If the save fails with **The state band could not be saved**, your role may not change this device.

## Change or remove the band

Select **State band: …** under the device name. Change the labels or colours and select **Save**, or choose
**None** in **State tag** and save to remove the band. A value that the tag reports for the first time later is
shown with its code until you give it a label.

## What's next

- [Trend Workspace](https://proxus.io/docs/monitor/trend-workspace): presentation mode and the **Machine state** layer.
- [Alerts](https://proxus.io/docs/monitor/alerts): the machine state when an alarm fired.