I-724D DNS/Modbus RTU Quick Start User Guide, July 2006, Version 1.1 ------ 8
The components of assembly objects in I-7242D
Assembly Object Instance
ID
Data Length (Byte)
Component devices
(ID, Address)
0x64 DO:
2
1(00016~00001)
0x65 AO:
6
2(40001~40003)
0x66 DI:
1
3(10007~10001)
0x67 AI:
8
4(30001~30004)
“User-defined Modbus Device Object” ( 0x64 ) attributes:
Attribute ID
Description
Data Type
Method
Value
0x01 Device
ID CHAR Get
0
0x02 Device
I/O
Type CHAR
Get
0
0x03
Device Start Address
WORD
Get
0
0x04 Device
Length WORD
Get
0
0x05
Data Lose Counter
WORD
Get/Set
0
0x14 DO
Data
Defined by
device num.
Get/Set 0
0x15 AO
Data
Defined by
device num.
Get/Set 0
0x16 DI
Data
Defined by
device num.
Get 0
0x17 AI
Data
Defined by
device num.
Get 0
7. Steps to implement the DeviceNet applications by
using the command set
1. Request the use of the Predefined Master/Slave Connection Set.
2.
Apply the Master’s Explicit Request Messages to set the
expected_packet_rate attribute of the I/O connection and make the I/O
Connection Object State established.
3. There are two ways to access I/O devices. One method is by the way of the
I/O connection object. Another is by using an explicit message to set/get the
I/O attribute of application object.
4. Release the use of the Predefined Master/Slave Connection Set.
