Single-Signal — a value with a caption

Single-Signal shows the current value of one variable with its caption (Label) and the unit from its presentation. It accepts scalar variables including strings; dropping another variable replaces the current one.

Settings

• Refresh ms — the period of the regular display refresh (default 500 ms). The most recent sample is shown.
• Peak threshold % — the immediate-redraw threshold for a large change, given in percent of the presentation range width (Max − Min).

The threshold works like this: a new sample is compared with the last displayed value, and when the difference is larger than threshold × (Max − Min) / 100, it is shown immediately, without waiting for the period — short peaks are not lost. Example: a presentation with the range 0–100 °C and a 5 % threshold mean that every change of 5 °C or more is shown immediately; smaller changes wait for the next regular refresh.

Edge cases — the control never "freezes", the settings only shift the behavior between "everything immediately" and "period only":

• Threshold 0 — every change is shown immediately, without limiting.
• Presentation range not filled in (Max − Min is not positive) — the immediate display is not used and the value refreshes only with the Refresh period; a peak is thus shown at most one period later.
• Range not matching the signal — the threshold is computed from the range width only, the current value does not matter. E.g. with Min 0 / Max 100 and a 5 % threshold, the threshold is a change of 5 units even for a signal moving around 27 000: if it wobbles by more than 5, every change redraws immediately (like threshold 0); a range too wide, on the other hand, hides the peaks below the threshold and the value follows the period only.

Writing to the device

Via the context menu you can enable Write Mode and also write the value to the device — the steps and conditions are described in Writing values to the device.

Next

Several values at once are shown by the Watch Table.