Technical Manual PD4-E-M (EtherCAT)
10 Description of the object dictionary
10 Description of the object dictionary
10.1 Overview
This chapter contains a description of all objects.
You will find information here on:
•
Functions
•
Object descriptions ("Index")
•
Value descriptions ("Subindices")
•
Descriptions of bits
•
Description of the object
10.2 Structure of the object description
The description of the object entries always has the same structure and usually consists of the
following sections:
Function
The function of the object dictionary is briefly described in this section.
Object description
This table provides detailed information on the data type, preset values and similar. An exact
description can be found in section "Object description"
Value description
This table is only available with the "Array" or "Record" data type and provides exact information
about the sub-entries. A more exact description of the entries can be found in section "Value
description"
Description
Here, more exact information on the individual bits of an entry is provided or any compositions
explained. A more exact description can be found in section "Description"
10.3 Object description
The object description consists of a table that contains the following entries:
Index
Designates the object index in hexadecimal notation.
Object name
The name of the object.
Object Code
The type of object. This can be one of the following entries:
•
VARIABLE: In this case, the object consists of only a variable that is indexed with subindex
0.
•
ARRAY: These objects always consists of a subindex 0 – which specifies the number of sub-
entries – and the sub-entries themselves, beginning with index 1. The data type within an
array never changes, i.e., sub-entry 1 and all subsequent entries are always of the same
data type.
•
RECORD: These objects always consists of a subindex 0 – which specifies the number of
sub-entries – and the sub-entries themselves, beginning with index 1. Unlike an ARRAY, the
data type of the sub-entries can vary. This means that, e.g., sub-entry 1 may be of a different
data type than sub-entry 2.
Version: 1.0.1 / FIR-v1748
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