# Synchronisation type of the structure element (P-EXTV-00018)

P-EXTV-00018 | Synchronisation type of the structure element
Description | By default, all structure elements inherit the synchronisation type for write/read access (see Access synchronisation by NC channel) from variable instantiation. This parameter defines the synchronisation type for each structure element.
Parameter | struct[i].element[j].synchronisation
Data type | BOOLEAN
Data range | TRUE, FALSE
Dimension | ----
Default value | TRUE *
Remarks | * The synchronisation type is inherited from variable instantiation (see Data sets to define external variables (var[i].*) )