Fnio s-series – Beijer Electronics NA-9379 User Manual

Page 67

MODBUS Programmable I/O NA-9379

FnIO S-Series

 Sub-function 0x0000(0) Return Query Data

The data passed in the request data field is to be returned (looped back) in the response.
The entire response message should be identical to the request.

Sub-function

Data Field (Request)

Data Field (Response)

Description

0x0000(0)

Any

Echo Request Data

 Sub-function 0x0001(1) Restart Communications Option

The remote device could be initialized and restarted, and all of its communications event counters are cleared.
Especially, data field 0x55AA makes the remote device to restart with factory default setup of EEPROM.

Sub-function

Data Field (Request)

Data Field (Response)

Description

0x0001(1)

0x0000, 0xFF00

Echo Request Data

Reset

0x0001(1)

0x55AA

Echo Request Data

Reset with Factory Default*

*All expansion slot configuration parameters are cleared.

 Sub-function 0x000A(10) Clear Counters and Diagnostic Register

The goal is to clear all counters and the diagnostic register. Counters are also cleared upon power–up.

Sub-function

Data Field (Request)

Data Field (Response)

Description

0x000A(10)

0x0000

Echo Request Data

 Sub-function 0x000B(11) Return Bus Message Count

The response data field returns the quantity of messages that the remote device has detected on the
communications system since its last restart, clear counters operation, or power–up.

Sub-function

Data Field (Request)

Data Field (Response)

Description

0x000B(11)

0x0000

Total Message Count

 Sub-function 0x000C(12) Return Bus Communication Error Count

The response data field returns the quantity of CRC errors encountered by the remote device since its last restart,
clear counters operation, or power–up.

Sub-function

Data Field (Request)

Data Field (Response)

Description

0x000C(12)

0x0000

CRC Error Count

 Sub-function 0x000D(13) Return Bus Exception Error Count

The response data field returns the quantity of MODBUS exception responses returned by the remote device since
its last restart, clear counters operation, or power–up.
Exception responses are described and listed in section 6.2.11.
Sub-function

Data Field (Request)

Data Field (Response)

Description

0x000D(13)

0x0000

Exception Error Count

 Sub-function 0x000E(14) Return Slave Message Count

The response data field returns the quantity of messages addressed to the remote device, or broadcast, that the
remote device has processed since its last restart, clear counters operation, or power–up.
Sub-function

Data Field (Request)

Data Field (Response)

Description

0x000E(14)

0x0000

Slave Message Count