Symbols that do not move, wrong or missing values, locked libraries, refused saves, changed drawings, 3D problems and slow drawings – causes and fixes.
Most SCADA problems are one of four things: the symbol is not connected, the device does not send the value, a library is locked, or the drawing changed under its connections. Work through the tables below from the top.
A symbol does not move or shows nothing
Check
How
Is the symbol connected?
Open the device’s or site’s Views and select Edit symbols. Unconnected symbols are tinted and the title counts “N / M connected”. The card may also say “These values are not placed on the picture yet.”
Does the device send the value?
In the symbol panel, the value shows “No value yet”, or “This device has not sent any values yet.” Check the device’s Telemetry tab. See Data does not arrive.
Is it the right key?
Compare the key in the panel with the device’s Telemetry tab, letter by letter. A key named <symbol id>.<field> connects by itself only when the symbol’s id matches.
Does the value fit the field?
The panel warns, for example “This value is text; the drawing expects a number.” Add an expression.
Does the expression work?
The preview says “This is not a complete expression”, “Only the names below can be used here.” or “This took too long to work out.” Fix it until Result now shows a value.
Is the value inverted?
“This value says closed or stopped; the drawing shows open or running here. Invert it with an expression.” Use !value.
Does the card show that device?
“N symbols read devices this card does not show, so they show no values”. Add those devices to the card’s data.
Is the data old?
A symbol marked stale or lost reflects a device that stopped reporting.
Does a rule hide or override it?
On the drawing’s Rules tab, check Matching now, or try values on What-if. A rule’s Hide or Stop here may apply.
Saving a drawing is refused
Message
Cause and fix
“The diagram adds symbols of a library this workspace does not hold: …”
You added or swapped in a symbol of a locked library. Undo it, or get the library. See Symbols and industry packs.
“The SCADA pieces of this tenant could not be checked; try again”
A temporary failure. Save again in a moment.
“Someone saved this diagram since you opened it…”
Save again to keep your version, or close and reopen to take theirs.
“This tenant has reached the most diagrams it can keep”
500 drawings. Delete unused ones.
“The diagram is too large”
Over 2 MiB. Split the process into several drawings.
“A diagram holds at most 200 symbols” (or 300 connections, 100 titles, zones and dividers, 200 rules)
Split the drawing.
“A symbol that has a command cannot be removed or renamed; remove its command first”
Remove the symbol’s command on the dashboard card first. See Commands on symbols.
“An id starts with a letter or and has only letters, digits, . -” / “Another symbol already has this id”
Fix the id under Advanced.
The palette shows padlocks
What you see
Meaning
“Part of , which this tenant does not hold”
Buy the library, or use a core symbol. Placed symbols keep drawing.
“ is not part of this installation’s licence”
The installation’s licence closes it. Contact your provider.
“The symbol libraries could not be checked; they are checked again shortly”
Until the check succeeds, every library symbol is locked and the core set stays open.
A symbol drawn as a neutral box
Its drawing has not loaded yet, or a rule draws a symbol of a locked library.
The view says the drawing changed
Message
Fix
“N saved connections no longer match the drawing.” / “The drawing changed since this was set up”
A symbol was deleted or its id changed. Select Review and reconnect, or undo the change in the drawing. Rename symbols with F2, which keeps their ids.
“The drawing of this view is gone: choose another one.”
The drawing was deleted. Choose another on Views; connections are kept where the new drawing has the same symbols.
“The drawing changed since this 3D view was made.”
Select Update the 3D view.
3D problems
Message
Fix
“This browser cannot show 3D (WebGL is off or missing).”
Turn on hardware acceleration in the browser, or use another browser. 2D drawings still work.
“3D designs are not shown on a display screen.”
Use a 2D drawing on wall screens.
“This change adds items of a 3D library this tenant does not hold (…).”
Undo the added item, or get the library.
“This tenant already keeps 200 designs, the most it can.”
Delete designs you no longer need.
“Part of this design could not be drawn”
The designer could not draw one of the pipes. Dashboards still show the design; nothing is saved over it unless you change something.
“The drawing has no equipment yet. Add symbols to it and save it first.”
You tried to make a 3D view of an empty or unsaved drawing.
Labels from rules do not show
“A rule sets a label: turn Labels on in the card settings to show it.”
The wheel does not zoom
Click inside the 3D card first.
A drawing is slow or cluttered
The Problems tab warns as you near a limit (“180 of 200 symbols are used”). Split a large plant into areas and link them with card actions or detail pages.
A device’s drawing values are polled every few seconds, not pushed one by one. Many process diagram cards on one board each poll; put large drawings on their own page.
Things placed from data are capped at 500 per drawing; rows past that are not drawn.
Turn off Animate running parts on wall screens with many drawings.
On phones, a full-screen card with the zoom pane is easier to read than a small card.
We use necessary cookies to run the site. With your permission we also use analytics and marketing cookies. You can change your choice at any time. Cookie policy
