I-7242D user manual
I-7242D DeviceNet/Modbus RTU Gateway User’s Manual, July 2006, Version 1.1 51/124
Example 4: (three AI devices)
In the example, apply three Modbus devices in the system (see Figure
5-7). The I-7242D would arrange these assembly and application objects as
Table 5-7 and 5-8.
Figure 5-7 Communication parameters of Modbus devices
Table 5-7 Application object attribute
Application
Instance ID
Device
Address
Device
I/O Type
Relay/Register
Start Address
Relay/Register
Data Length
0x01 1 3
(AI) 1
4
0x02 2 3
(AI) 1
8
0x03 3 3
(AI) 1
2
Table 5-8 Assembly object attribute
Assembly Object
Instance ID
Data Length (Byte)
Component devices
(ID, Address)
0x64 AI:
28
1(30001~30004),
3(30001~30008),
5(30001~30002)
Note:
This example lacks of DO, AO and DI devices. Therefore, the number of
assembly object is one. Therefore, the instance ID of assembly object is 0x64.
