10. Appendix D: DeviceNet Objects
10.11. I/O Data Output Mapping Object (Class 16#A1)
The “I/O Data Output Mapping Object” has only one instance (Instance ID = 16#01) and is specific to the LUFP9 gateway. It contains all the data from the gateway’s unique output area. The only attribute (Attribute ID = 16#01) of the instance from this object is associated with the “Output1” area. This output area gathers all the memory locations whose values are transmitted to the Modbus slaves via Modbus queries.
Attributes of class 16#A1
ID | Access | Name | Need | Type | Value | Description |
16#01 | Get | Revision | Optional | UINT | 1 | Revision index of “I/O Data Output Mapping Object” class. |
16#64 | Get / Set | Output1 offset | Optional | USINT | 16#0000 | Relative starting address of output area no. 1. (1) |
16#6E | Get / Set | Output1 length | Optional | USINT | 16#0020 | Size, expressed in bytes, of output area no. 1. (1) |
(1)These 2 attributes correspond to the “Param18” and “Param19” parameters referenced by the EDS file supplied with the gateway. Write access to them (Access = Set) is reserved for DeviceNet configuration tools, since it allows you to change the location or the size of this output data area. So the “Set_Attribute_Single” service should not be used with these attributes. Changing any one of these two attributes has direct consequences on the attribute 16#01 of instance 16#01 from the “I/O Data Output Mapping Object” (size of the data). This attribute is not created if the size of the gateway’s output area is null. The “Output1 offset” attribute corresponds to an offset from the start of the memory area reserved for the output data (16#0200).
The values located in the “Value” column correspond to the LUFP9 gateway’s default configuration (“Output1” area located at address 16#0200 and made up of 32 bytes).
Services in class 16#A1
Service code | Name of the service | Need | Description |
16#0E | Get_Attribute_Single | Required | This service allows to read the value of one of the class attributes. |
Attributes of instance 16#01 of class 16#A1
ID | Access | Name | Need | Type | Value |
16#01 | Get / Set | Data | Optional | USINT […] | (output area no.1) |
This attribute corresponds to the gateway’s “Output1” area. Reading it gives access to the values of all the data located in this area, and writing it allows to change them. These values take the form of an array of bytes whose size corresponds to the size of the area. This very same attribute is also involved when using instance 16#96 of the Assembly Objects (Class 16#04) described in chapter 10.7 (voir page 98).
N.B. With the default configuration, attribute 16#01 corresponds to an array of 32 bytes whose content is described in chapter 8.2.2 Output Data Memory Area, page 85.
Services of instance 16#01 of class 16#A1
Service code | Name of the service | Need | Description |
16#0E | Get_Attribute_Single | Optional | This service allows to read the array of values corresponding to the |
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| sole attribute of the single instance from “I/O Data Output Mapping |
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| Object.” |
16#10 | Set_Attribute_Single | Required | This service allows to write/change all the values corresponding to |
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| the sole attribute of the single instance from “I/O Data Output |
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| Mapping Object.” |
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