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Modbus/USS
3.7 Diagnostics
3.7.6
Error
List of error numbers
Table 3- 53
Initialization errors
Error number
(decimal)
ERROR_INFO
0
0
No error
1
SFC 51->RET_VAL
Error reading the system
status list with SFC 51.
2
S_SEND->STATUS,
S_RCV->STATUS
Timeout or error during
Check whether "Modbus slave" has been set as
module initialization (error in the protocol for this interface.
S_SEND request).
Check whether the "ID" specified in the
communication FB is correct.
Analyze ERROR_INFO.
Table 3- 54
Event
Remedy
Analyze RET_VAL in ERROR_INFO; eliminate the
cause.
Error processing a function code
Error number
(decimal)
ERROR_INFO
Event
Remedy
11
Start address
Illegal start address
transferred to the
communication FB by the
driver.
Check the Modbus address of the Modbus master
system.
12
Number of registers
Illegal number of registers
transferred to the
communication FB by the
driver.
Number of registers = 0.
Check the number of registers of the Modbus
master system.
If necessary, restart the module (Mains_ON).
13
Number of registers
Illegal number of registers
transferred to the
communication FB by the
driver:
Number of registers > 128.
Check the number of registers of the Modbus
master system.
If necessary, restart the module (Mains_ON).
14
Bit memory M –
End address
Attempt to access the
SIMATIC flags memory
area beyond the end of the
area.
Notice:
The area length in the
SIMATIC CPU depends on
the type of CPU.
Reduce the length of the Modbus start address or
the access length in the Modbus master system.
15
Outputs Q –
End address
Attempt to access the
SIMATIC outputs memory
area beyond the end of the
area.
Notice:
The area length in the
SIMATIC CPU depends on
the type of CPU.
Reduce the length of the Modbus start address or
the access length in the Modbus master system.
Inputs I –
End address
218
Serial interface modules
Operating Instructions, 03/2009, A5E00124881-05