Technical Manual PD4-E-M (EtherCAT)10 Description of the object dictionary• VISIBLE_STRING: The object describes a character string coded in ASCII. The length of thestring is specified in subindex 0; the individual characters are stored beginning in subindex 1.These character strings are not terminated by a null character.Data typeThe size and interpretation of the object is specified here. The following notation is used for the"VARIABLE" object code:• A distinction is made between entries that are signed; these are designated with the prefix"SIGNED". For entries that are unsigned, the prefix "UNSIGNED" is used.• The size of the variable in bits is placed before the prefix and can be 8, 16 or 32.SavableDescribed here is whether this object is savable and, if so, in which category.Firmware versionThe firmware version beginning with which the object is available is entered here.Change history (ChangeLog)Any changes to the object are noted here.There are also the following table entries for the "VARIABLE" data type:AccessThe access restriction is entered here. The following restrictions are available:• "read/write": The object can both be read as well as written• "read only": The object can only be read from the object dictionary. It is not possible to set avalue.PDO mappingSome bus systems, such as CANopen or EtherCAT, support PDO mapping. Described in thistable entry is whether the object can be inserted into a mapping and, if so, into which. Thefollowing designations are available here:• "no": The object may not be entered in a mapping.• "TX-PDO": The object may be entered in an RX mapping.• "RX-PDO": The object may be entered in a TX mapping.Allowed valuesIn some cases, only certain values may be written in the object. If this is the case, these valuesare listed here. If there are no restrictions, the field is empty.Preset valueTo bring the controller to a secured state when switching on, it is necessary to preset a numberof objects with values. The value that is written in the object when the controller is started isnoted in this table entry.10.4 Value descriptionNoteFor the sake of clarity, a number of subindices are grouped together if the entries all have the samename.Version: 1.0.1 / FIR-v1748 102
