Table 10. Request To Read Discrete Inputs; Table 11. Request To Read Holding Registers; Table 12. Request To Read Input Registers; Table 13. Request To Read Exception Status - Eaton PowerXL DG1 Series VFD Communications Manual

Example of the request to read Discrete Inputs 2000–2003
from Slave device 18.

Table 10. Request to Read Discrete Inputs

Item Code
Slave address 0x12
Function code 0x02
Start address High 0x07
Start address Low 0xD0
Number of Discrete 0x00
Inputs High
Number of Discrete 0x03
Inputs Low
CRC High 0x3A
CRC Low 0x25
Example of the request to read Holding Registers 2000–2003
from Slave device 18.

Table 11. Request to Read Holding Registers

Item Code
Slave address 0x12
Function code 0x03
Start address High 0x07
Start address Low 0xD0
Number of Holding 0x00
Registers High
Number of Holding 0x03
Registers Low
CRC High 0x07
CRC Low 0xE5
Example of the request to read Input Registers 2000–2003
from Slave device 18.

Table 12. Request to Read Input Registers

Item Code
Slave address 0x12
Function code 0x04
Start address High 0x07
Start address Low 0xD0
Number of Input 0x00
Registers High
Number of Input 0x03
Registers Low
CRC High 0xB2
CRC Low 0x25
Description
Starting address 0x07D0 hex (= 2000)
Number of Discrete Inputs
0x0003 hex (= 3)
Description
Starting address 0x07D0 hex (= 2000)
Number of Holding Registers
0x0003 hex (= 3)
Description
Starting address 0x07D0 hex (= 2000)
Number of Input Registers
0x0003 hex (= 3)
Modbus RTU On-Board Communications
Example of the request to read exception status from Slave
device 18.

Table 13. Request to Read Exception Status

Item
Slave address
Function code
CRC High
CRC Low
Example of Read Diagnostics from Slave address 18.

Table 14. Read Diagnostics

Item
Slave address
Function code
Sub function High
Sub function Low
Data High
Data Low
CRC High
CRC Low
Example of the request to write single coil 2000 from slave
device 18, the output value is 1.

Table 15. Request to Write Single Coil

Item
Slave address
Function code
Output address High
Output address Low
Output value High
Output value Low
CRC High
CRC Low
PowerXL DG1 Series VFD MN040010EN—May 2014 www.eaton.com
Code Description
0x12
0x07
4C
D2
Code Description
0x12
0x08
0x00 Sub function code 0x0000 (= 0)
Note. Only support sub function code
0x00
0x0000
0xA5 Data 0xA5A5 (= 42405)
0xA5
0x59
0x83
Code Description
0x12
0x05
0x07 Starting address 0x07D0 hex (= 2000)
0xD0
0xFF Output value 0xFF00 hex (= 65280)
Note. Output value is 0x0000 or 0xFF00
0x00
0x8E
0x14
11