Instance Attribute Definitions: Attribute 3-Request/Write Data; Instance Attribute Definitions: Attribute 4-Data Length; Common Services; Instance Definitions - Comtrol DeviceMaster EtherNet/IP-Modbus EIP-MOD User Manual

| Informational Objects | Assembly Object (For Class 1 Interface) | Common Services |

2.2.7.2.1. Instance Attribute Definitions: Attribute 3-Request/Write Data

Dependent on the instance number, this is either the PDI data block and/or the PDO data block.

2.2.7.2.2. Instance Attribute Definitions: Attribute 4-Data Length

This is the maximum data length for each Assembly instance.

2.2.7.3. Common Services

This table shows the Common Services for the Assembly Object for a Class 1 Interface.
Service Code Implemented in Class
01 hex Yes
0E hex Yes
10 hex No
02 hex No

2.2.7.4. Instance Definitions

Each Assembly instance is tied directly to a Shared Memory block of Holding Registers or Coils. Each input
instance is enabled only if the corresponding block's Read Class1 Enable has been selected in the Shared
Memory configuration. Each output instance is enabled only if the corresponding block's Write Master(s)
option has been set to EIP Class1.

2.2.7.4.1. Instance Definitions (Default)

This table shows the Assembly Object instance definitions for the default Shared Memory configuration.
Holding Register Block 1
Coils Block 1
Holding Register Block 2
Coils Block 2
For all other Shared Memory blocks:
• Read Class1 Enable not selected
• Write Master(s) not set to EIP Class1
Assembly
Instance
Number
Read data from Shared Memory
101
Holding Registers Block 1
Read data from Shared Memory
109
Coils Block 1
36 - Chapter 2. EtherNet/IP Interface Profile (ControlLogix)
No
Yes
Yes
No
Default Configuration Shared Memory Configuration
Read Class1 Enable selected
Read Class1 Enable selected
Write Master(s) set to EIP Class1
Write Master(s) set to EIP Class1
Assembly Input Instances
Description
Implemented in Instance
Data Type
WORD Array
Length = 200
WORD Array
Length = 20 Words (320 coils)
Service Name
Get_Attributes_All
Get_Attribute_Single
Set_Attribute_Single
Set_Attribute_All
Data Values
0-FFFF (hex)
0-FFFF (hex)
DeviceMaster EIP-MOD User Guide: 2000664 Rev. A
Access
Rule
Get
Get