Loop Back Diagnostic Test Command (0X08) - Siemens SINAMICS PERFECT HARMONY GH180 Function Manual

Request Details
Table 3-30 Write Input Register Request (TX) from Master
Field Name
Slave Address
Function
Register Address (high)
Register Address (low)
Preset Data (high)
Preset Data (low)
Error Check (CRC) byte 1
Error Check (CRC) byte 2
Response Details
The write input register response (RX) from the drive is an echo of the request and therefore
is identical; refer to table above.
Note
Parameter names and their corresponding data ID numbers are listed in Appendix
IDs .
3.5.5

Loop Back Diagnostic Test Command (0x08)

Description
The "loop back test" command allows the Modbus master to test the communication link to
the drive.
Example
A sample of a "loop back test" request and the associated response, in hexadecimal, is given
below.
Loop Back Test Command
TX (Request)
RX (Response)
The loop back test response (RX) from the drive is an echo of the request and therefore is
identical.
NXGpro Communication
Function Manual, AB, A5E33486415A
Value (in Hex)
0x01
0x06
0x00
0x42
0x00
0x64
—
—
Modbus Communication
Notes
0x01 = 1 decimal
Write input register command
Register number 40067
Value = 100
Byte 1 of CRC for this message
Byte 2 of CRC for this message
01 08 00 00 03 E8 -- --
01 08 00 00 03 E8 -- --
3.5 Functions
Output Data
69