Chapter 2. Ethernet/Ip Interface Profile (Controllogix); Modbus Object (44 Hex, 1 Instance); Class Attributes; Instance Attributes - Comtrol DeviceMaster EtherNet/IP-Modbus EIP-MOD User Manual

Chapter 2. EtherNet/IP Interface Profile
(ControlLogix)
This section describes the EtherNet/IP objects included in the ControlLogix EtherNet/IP interface and
supported by the DeviceMaster EIP-MOD.

2.1. Modbus Object (44 Hex, 1 Instance)

The Modbus Object provides an interface to the data and functions within a Modbus device or the Shared
memory on the DeviceMaster EtherNet/IP-Modbus gateway. It utilizes CIP object specific services to
implement Modbus functions through an explicit CIP message.
Note: The instance number is used to define the device or unit Id of the Modbus device or Shared memory.
There is no support for broadcast Modbus messages, which have a device Id of zero.

2.1.1. Class Attributes

The following table displays the Class Attributes for Modbus Object (44 hex, 1 Instance).
Attribute
ID
1
2
3
6
7

2.1.2. Instance Attributes

There are no Instance Attributes.

2.1.3. Common Services

This table provides the Common Services for Modbus Object (44 hex, 1 instance).
Service Code Implemented in Class
0E hex Yes
DeviceMaster EIP-MOD User Guide: 2000664 Rev. A
Data
Name
Type
Revision UINT
Max Instance UINT
Num Instances UINT
Maximum
Number Class UINT
Attribute
Maximum
Number Instance UINT
Attribute
Data Value(s)
1
255 (maximum Modbus device Id) Get
255 (maximum Modbus device Id) Get
7
0
Implemented in Instance
Yes

Chapter 2. EtherNet/IP Interface Profile (ControlLogix) - 21

Access
Rule
Get
Get
Get
Service Name
Get_Attribute_Single