General Status Display for Connections

A device's connection status is shown as a four-section status display in operating fields and workspaces.

Key for Figure “General Status Display for Connections”
Item	Explanation
1	Connection status
2	PLC status
3	Status of the localbus (e.g., localbus of 750 Series)
4	Fieldbus status

The status information is likewise displayed in the status bar. Information on the last program compilation is also displayed here. The following table provides an overview of the different symbols:

General Status Display for Connections
Symbol in Status Bar	Symbol in Workspace	State	Description
Connection
-		Not connected	The selected device is not connected.
		Connected	The selected device is connected.
		Limited connection	The selected device has a limited connection (CODESYS connection error).
		Manual override mode active	The manual override mode is active. Write access to modules is possible.
		Simulation Mode Active	The Simulation mode is active.
Program Compilation (Build)
	-	Build successful	The compilation of the program was successful. Date and time of the last compilation are displayed.
	-	Build not successful	Program compilation of the program not successful. Date and time of the last compilation are displayed.
	-	No information	No information available. Possible reasons: Several devices are selected, or a non-programmable device was selected or no project compiled.
SPS
		Stop	The controller is not running (PLC stopped).
		Running	The controller is running.
Local bus
		Not running	No communication via the internal bus.
		Running	Internal bus ready for communication.
		Error	Error is present. Note the error messages in the message window.
Fieldbus
		Not used	No communication via fieldbus.
		Running*)	Fieldbus ready for communication.
		Error	Error is present. Note the error messages in the message window.

^*) Observe the following note:

Note

Note on Modbus communication problems!

Modbus communication problems may occur even if “Running” is indicated as the Modbus status. For example, variable values may remain at “zero.”

Try disconnecting and reconnecting the Modbus slave. If the status indicator does not update and the Modbus server remains inaccessible, you can request further diagnostics via the library instance “FbModbusRemoteSlave”.

The description is available under Diagnostic Options for Modbus Communication.

If a device is connected online, connection status is also displayed in a pop-up display as soon as the mouse is placed over the device. This applies to both head stations/controllers and connected I/O modules.

The connecting line provides a reference point between the device tiles in network view (Communication view) in which network the fieldbus is in the error status.

Error Status on Connecting Lines
Error Status on Connecting Lines	Status	Description
	Fieldbus is not running	There is no communication via the fieldbus. Note the error messages in the message window.

Program elements of an application also have symbols that represent the status of a program:

Status Indication for Program Elements
Symbols in the Program Structure	Status	Description
	Not connected	No connection to the device. No statement about the application is possible.
	Program can run	There are no errors when compiling program elements and the program can run. Depending on the program flow and task execution, however, the programs will not necessarily execute.
	Program stopped	The application was stopped.
	Possible error	There are errors (e.g., compile error).
	No compile	Program elements can be excluded from compiling (context menu > [Settings] > “Compile” tab). Applications excluded from compiling are displayed in gray and italics.