I-7242D user manual
I-7242D DeviceNet/Modbus RTU Gateway User’s Manual, July 2006, Version 1.1 50/124
Example 3: (two DO devices, two DI devices)
In the example, apply four Modbus devices in the system (see Figure 5-6).
The I-7242D would arrange these assembly and application instances as
Figure 5-6 and table 5-5.
Figure 5-6 Communication parameters of Modbus devices
Table 5-5 the information of the Application instances
Application
Instance ID
Device
Address
Device
I/O Type
Relay/Register
Start Address
Relay/Register
Data Length
0x01 11 0
(DO) 1
8
0x02 12 0
(DO) 1
16
0x03 13 2
(DI) 1
4
0x04 14 2
(DI) 1
8
Table 5-6 the information of the Assembly instances
Assembly Object
Instance ID
Data Length (Byte)
Component devices
(ID, Address)
0x64 DO:
2
11(00008~00001),
13(00004~00001)
0x65 DI:
3
12(10016~10001),
14(10008~10001)
Note:
This example lacks of AO and AI devices. Therefore, the number of
assembly object is two. If this example has AO device, the number of
assembly objects would become to three. The instance ID of AO components
becomes 0x65 and the instance ID of DI components would change to 0x66.
