Omron C200HW-CORT21-V1, Руководство по эксплуатации

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I/O Data mapping
Section 4-2
52
The C200HW-CORT21-V1 supports 4 different data types for input and
output data:
8-bit data objects
16-bit data objects
32-bit data objects
64-bit data objects
The Default_Input_Bytes and Default_Output_Bytes are the application
objects that are by default mapped to the four transmit and receive PDOs of
the predefined connection set (see also section 1-3-5).
Network variables
The objects located at the index 2001h ~ 2004h and 2101h ~ 2104h are so
called network variables. These objects are defined in the EDS-file (see
appendix A) as dynamic channels because they are not present in the object
dictionary structure until the specific object is linked to another device.
The mapping of the application objects is twofold:
1. Mapping of the application objects onto PDOs
2. Mapping of the application objects onto PLC memory locations
4-2-2 Mapping of the Application Objects onto PDOs
When the Unit starts up with the default values as defined in the communi-
cation profile, only the Default_Input_Bytes and Default_Output_Bytes are
mapped. The mapping of these objects is listed in the following table.
Mapped Data Object PDO
Index Sub-index
TPDO1 2000h 01
TPDO2 2000h 02
TPDO3 2000h 03
TPDO4 2000h 04
RPDO1 2100h 01
RPDO2 2100h 02
RPDO3 2100h 03
RPDO4 2100h 04
The PDOs listed in the table are the PDOs of the predefined connection set
(see section 1-3-5).
The objects located at indices 2001h ~ 2004h and 2101h ~ 2104h can be
mapped by configuring the PDO mapping parameters to point to these
objects (see section 3-3-2-2). In this way it is also possible to change the
mapping of the predefined connection set. For example it is possible to
assign object 2001h with sub-index 01 to TPDO1 and to assign the
Default_Input_Bytes to other transmit PDOs than TPDO1 ~ TPDO4.
The most common way of mapping the objects is by using a network
configuration tool. This tool assigns the objects to the correct PDO when
linking the objects of two devices together (see the end of section 3-3-2-1).
To prevent having to map objects to PDOs and setting the associated
communication parameters every time the Unit is powered-up, the Unit
enables storage of the parameters in non-volatile memory (see section 3-3-2-
9).