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DeviceNet Communications Interface
Attribute is the same as the Parameter Number. For example, REFERENCE::REMOTE
SETPOINT has PREF 101.01, so Instance is 100 (0x64) and Attribute is 1.
The Data Format for this object is fixed as follows:
Data Type
Data Format
PLC Size
BOOL
0x00 = FALSE, 0x01 = TRUE
1 byte
INTEGER
32-bit signed integer
4 bytes
REAL
IEEE-754 32-bit floating point
4 bytes
User Defined Register Set Object
Class 0x65, Instances 0x01 to 0x05, Attributes 0x01 to 0xFF
The User Defined Register Set Object provides access to the registers as declared in the DSE
configuration. Each register is mapped to be a Polled Input, Polled Output, Cyclic Output,
Explicit Input or Explicit Output. Also, its size and encoding are selected.
The Instance number selects either Input or Output register and the Attribute is the number of
the Register within that address space. Instance 1 contains all of the Explicit Input registers and
Instance 2 contains all of the Explicit Output Registers.
In the example above, the User Defined register FII.1 is read and written using Class 0x65,
Instance 1 and Attribute 2. It is type INT, so will be transferred as 2 bytes. The User Defined
register FIO.1 is read using Class 0x65, Instance 2, Attribute 1. It is type UDINT, so will be
transferred as 4 bytes.
Instances 3, 4 and 5 can be used to read registers mapped as Polled Input, Polled Output and
COS/Cyclic Output.
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