Siemens SITRANS F Series Operating Instructions Manual page 91

Sub-
func‐
tion
code
(Dec)
13
14
15
16
17
18
20
Function code 8 example
Query
Slave address
Function
Sub-function Hi
Sub-function Lo
Data Hi
Data Lo
:
Data Hi
Data Lo
CRC
Response
Slave address
Function
SITRANS FST090
Operating Instructions, 11/2021, A5E50387341-AA
Name
Return Bus Exception Error
Count
Return Slave Message Count
Return Slave No Response
Count
Return Slave NAK Count
Return Slave Busy Count
Return Bus Character Overrun
Count
Clear Overrun Counter and Flag Clears the overrun error counter and resets the error flag.
Description
The response data field returns the quantity of MODBUS ex‐
ception responses returned by the remote device since its last
restart, clear counters execution, or power–up.
The response data field returns the quantity of messages
broadcast or addressed to the remote device that the remote
device has processed since its last restart, clear counters exe‐
cution, or power–up.
The response data field returns the quantity of messages ad‐
dressed to the remote device for which it has returned no
response (neither a normal response nor an exception re‐
sponse), since its last restart, clear counters execution, or
power–up.
The response data field returns the quantity of messages ad‐
dressed to the remote device for which it returned a Negative
Acknowledge (NAK) exception response, since its last restart,
clear counters execution, or power–up.
The response data field returns the quantity of messages ad‐
dressed to the remote device for which it returned a Slave
Device Busy exception response, since its last restart, clear
counters execution, or power–up.
The response data field returns the quantity of messages ad‐
dressed to the remote device that it could not handle due to a
character overrun condition, since its last restart, clear coun‐
ters execution, or power–up.
1 byte
1 byte
1 byte
1 byte
1 byte
1 byte
:
1 byte
1 byte
2 bytes
1 byte
1 byte
Modbus communication
A.2 Modbus function codes
91