Overview of EXTV parameters

The overview of External Variable parameters is sorted into a 4-column table.

Column 1 contains the unambiguous identifier of the start-up parameter called the “ID” which consists of the prefix “P-EXTV” and a unique 5-digit number,
e.g. P-EXTV-00001.
Column 2 represents the data structure which defines the parameter,
e.g. var[i]
The structure is a categorisation aid and is described in the following section. If an entry is missing in ‘structure’, this is not an error. The parameter in column 3 is then only valid on its own.
Column 3 contains the “parameter” with its exact name,
e.g. name
The important thing is that “structure”+”parameter” always belong together and must be configured in exactly the same way in the External Variables list,
e.g. var[i].name
Column 4 contains the “functionality” in a summarised term/short description,
e.g. name of external variable.

ID	Structure	Parameter	Functionality/short description
P-EXTV-00001	var[i].	name	Name of the External Variable
P-EXTV-00002	var[i].	byte_offset	Position of the External Variable in the memory
P-EXTV-00003	var[i].	type	Variable type
P-EXTV-00004	var[i].	scope	Validity of the variable
P-EXTV-00005	var[i].	synchronisation	Synchronisation type of the variable
P-EXTV-00006	var[i].	access_rights	Access rights of the variable
P-EXTV-00007	var[i].	array_elements	Number of elements in an array of structure elements.
P-EXTV-00008	var[i].	size	Size of the variable
P-EXTV-00009	var[i].	create_hmi_interface	Enabling access by HMI
P-EXTV-00010		number_used_variables	Number of configured external variables
P-EXTV-00011		check_overlapping_variables	Plausibility check of the memory layout
P-EXTV-00012		auto_memory_mode	automatic memory layout
P-EXTV-00013		init	Initialisation with default values
P-EXTV-00015	struct[i].	name	Name of the variable type
P-EXTV-00016	struct[i].element[j].	name	Name of the structure element
P-EXTV-00017	struct[i].element[j].	type	Type of the structure element
P-EXTV-00018	struct[i].element[j].	synchronisation	Synchronisation type of the structure element
P-EXTV-00019	struct[i].element[j].	access_rights	Access right of the structure element
P-EXTV-00020	struct[i].element[j].	array_elements	Array size of a structure element
P-EXTV-00021	struct[i].element[j].	size	Size of a structure element of type VSTRING
P-EXTV-00022		use_extended_string_var	Number of characters of a string variable
P-EXTV-00047	var[i].	suppress_export	Suppress variable export to the PLC description
P-EXTV-00048	var[i].	start	Variables with overlapping memory area