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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
0x01
0x02
0x03
0x04
0x05
0x06
Table 5-4 the information of the Assembly instances
Assembly Object
Instance ID
0x64
0x65
0x66
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.
I-7242D DeviceNet/Modbus RTU Gateway User's Manual, July 2006, Version 1.1
Device
Device
Address
I/O Type
2
0 (DO)
4
0 (DO)
6
1 (AO)
8
1 (AO)
10
3 (AI)
12
3 (AI)
Data Length (Byte)
DO: 4
AO: 10
AI: 14
I-7242D user manual
Relay/Register
Relay/Register
Start Address
Data Length
1
1
1
2
2
2
Component devices
(ID, Address)
2(00010~00001),
4(00012~00001)
6(40001~40002),
8(40002~40004)
10(30002~30006).
12(30002~30003)
10
12
2
3
5
2
49/124
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