I-7242D user manual
I-7242D DeviceNet/Modbus RTU Gateway User’s Manual, July 2006, Version 1.1 49/124
Example 2: (two DO devices, two AO devices, two AI devices)
In this example, apply six Modbus devices in the system (see Figure 5-5).
The I-7242D would arrange these assembly and application instance Figure
5-5 and table 5-3.
Figure 5-5 Communication parameters of Modbus devices
Table 5-3 the information of the Application instances
Application
Instance ID
Device
Address
Device
I/O Type
Relay/Register
Start Address
Relay/Register
Data Length
0x01 2 0
(DO) 1 10
0x02 4 0
(DO) 1 12
0x03 6 1
(AO) 1
2
0x04 8 1
(AO) 2
3
0x05 10 3
(AI) 2
5
0x06 12 3
(AI) 2
2
Table 5-4 the information of the Assembly instances
Assembly Object
Instance ID
Data Length (Byte)
Component devices
(ID, Address)
0x64 DO:
4
2(00010~00001),
4(00012~00001)
0x65 AO:
10
6(40001~40002),
8(40002~40004)
0x66 AI:
14
10(30002~30006).
12(30002~30003)
Note:
This example lacks of DI devices. Therefore, the number of assembly
object is three. If this demo has DI device, the number of assembly objects
would become to four. The instance ID of DI components becomes 0x66 and
the instance ID of AI components would change to 0x67.
