Function Code Fc11 (Get Comm Event Counter); Table 91: Request Of Function Code Fc11; Table 92: Response Of Function Code Fc11; Table 93: Exception Of Function Code Fc 11 - WAGO -I/O-SYSTEM 750 XTR Manual

WAGO-I/O-SYSTEM 750 XTR
750-352/040-000 FC ETHERNET G3 XTR
Pos : 94.12 /Serie 750 ( WAGO-I/O-SYST EM)/Funkti onsbesc hrei bung/F eldbus kommuni kation/M ODBU S/Anwendung der MOD BUS-F unktionen - FC11, FC15, FC 16 @ 4\mod_1235567470328_21.doc x @ 27730 @ 444 @ 1
11.2.3.7

Function Code FC11 (Get Comm Event Counter)

This function returns a status word and an event counter from the slave device's
communication event counter. By reading the current count before and after a
series of messages, a master can determine whether the messages were
handled normally by the slave.
Following each successful new processing, the counter counts up. This counting
process is not performed in the case of exception replies, poll commands or
counter inquiries.
Request

Table 91: Request of Function code FC11

Byte
Byte 0, 1
Byte 2, 3
Byte 4, 5
Byte 6
Byte 7
Response
The reply contains a 2-byte status word and a 2-byte event counter. The status
word only contains zeroes.

Table 92: Response of Function Code FC11

Byte
...
Byte 7
Byte 8, 9
Byte 10, 11
The event counter shows that 3 (0x0003) events were counted.
Exception

Table 93: Exception of Function Code FC 11

Byte
...
Byte 7
Byte 8
Field name
Transaction identifier
Protocol identifier
Length field
Unit identifier
MODBUS function code
Field name
MODBUS function code
Status
Event count
Field name
MODBUS function code
Exception code
Fieldbus Communication 163
Example
0x0000
0x0000
0x0002
0x01 not used
0x0B
Example
0x0B
0x0000
0x0003
Example
0x85
0x01 or 0x02
Version 1.3.0
Manual