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4.11
User-defined Modbus Command Object ( Class : 0x65 )
The "User Defined Modbus Command" Object has maximum three
instances and is specific to the I-7242D. Its attributes contain the application
data, which can be defined by the special Modbus commands and can be
transmitted to the Modbus slaves via Modbus queries. Another attribute of this
object's instances can receive data from a Modbus response
Users can only use Get_Attribute_Single and Set_Attribute_Single to
read/write their commands from/to Modbus devices via this object.
Class Attribute
Attribute ID
0x01
0x02
Class Service
Service Code
0x0E
Instance Attribute
Attribute ID
Query Modbus Message:
0x01
Response Modbus Message:
0x02
Length of Response Modbus
0x03
Send User-defined Modbus
0x04
0x05
Instance Service
Service Code
0x0E
0x10
I-7242D DeviceNet/Modbus RTU Gateway User's Manual, July 2006, Version 1.1
Attribute name
Revision
Max Instance
Get_Attribute_Single
Description
Address
Command
Register
Number of Register
Address
Command
Register
Message
Command
Data Lose Counter
Get_Attribute_Single
Set_Attribute_Single
Data Type
UINT
UINT
Service Name
Data Type
Structure of
USINT
USINT
UINT
USINT
Structure of
USINT
USINT
UINT
UINT
CHAR
WORD
Service name
I-7242D user manual
Method
Value
Get
Get
Need
Required
Method
Value
Determined by
Get/Set
user defined
Determined by
Get
user defined
Get/Set
0
Non-zero:
Get/Set
Send Command
Get/Set
0
Need
Required
Required
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