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User Manual of A90 Series Inverter

278

Starting address Hi

Starting address

Exception

code

Starting address Lo

Starting address

Number (Hi) of registers

Number (Hi) of

registers

Number (Lo) of registers

Number (Lo) of

registers

Number of bytes

(F00.14)

(F00.15)

★

This function code cannot be used to change the parameters of the attribute “○”

(it cannot be changed during operation). That is, only the parameters of the

attribute “●” (it can be changed during operation) can be changed. Otherwise, the

error code 1 will be returned.

12.3.3.4 0x08: function code for diagnosis

The Modbus function code 08 involves a series of tests to check the communication

system between the client (master station) and server (slave station), or internal error

statuses of the server.

The test to be executed is defined by the sub-function code fields of two bytes in the

request. The server makes responses properly.

Copy the function codes and sub-function codes. Some diagnoses will enable the

remote terminal unit to return the corresponding data through the data field in normal

response.

Under normal circumstances, when the diagnosis function is sent to the remote

terminal unit, the user program in this remote terminal unit will not be affected. The user

logic cannot be accessed by diagnosis, such as: discrete magnitude and register. The error

counter in the remote terminal unit can be remotely reset by applying some functions.

Sinee A90-4T5R6B User Manual

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