Siemens SITRANS FC410 Operating Instructions Manual page 123

Sub-
function
code
(Dec)
12
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
FC410 with Modbus
Operating Instructions, 02/2016, A5E33120874-AC
Name
Return Bus Communication
Error Count
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
Description
The response data field returns the quantity of CRC errors
encountered by the remote device since its last restart,
clear counters execution, or power–up.
The response data field returns the quantity of MODBUS
exception 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 execution, or power–up.
The response data field returns the quantity of messages
addressed to the remote device for which it has returned no
response (neither a normal response nor an exception
response), since its last restart, clear counters execution, or
power–up.
The response data field returns the quantity of messages
addressed 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
addressed to the remote device for which it returned a Sla-
ve Device Busy exception response, since its last
restart, clear counters execution, or power–up.
The response data field returns the quantity of messages
addressed to the remote device that it could not handle due
to a character overrun condition, since its last restart, clear
counters execution, or power–up.
Clears the overrun error counter and resets the error flag.
1 byte
1 byte
1 byte
1 byte
1 byte
1 byte
:
1 byte
1 byte
2 bytes
Modbus holding registers
A.2 Modbus function codes
121