Rockwell Automation RECOMM-ENET EtherNet/IP Communications Module - Manual (Page 138)

C-2 EtherNet/IP Communications Module
C.1 Identity Object
Class Code
Instances
The number of instances depends on the number of components in
the device connected to the module. This number of components
can be read in Instance 0, Attribute 2.
Class Attributes
SINT 8-bit signed integer
USINT 8-bit unsigned integer
INT 16-bit signed integer
UINT 16-bit unsigned integer
DINT 32-bit signed integer
UDINT 32-bit unsigned integer
BOOL 8-bit value -- low bit is true or false
BOOL[n] Array of n bits
STRING[n] Array of n characters
SHORT_STRIN
G 1-byte length indicator + that many characters
STRUCT Structure name only - no size in addition to elements
CONTAINER 32-bit parameter value - sign extended if necessary
TCHAR 8 or 16-bit character
REAL 32-bit floating point
Table 3.1 – Supported Data Types
Data Type Description
Hexadecimal Decimal
0x01 1
Instance Description
0 Class
1 Entire device (DPI host)
2 - 7 DPI Peripherals on ports 1 - 6
Attribute
ID
Access
Rule Name Data Type Description
2 Get Max Instance UINT Total number of instances