Date Code 980420
Error Codes and Messages
B-1
SEL-2711 Instruction Manual
APPENDIX B: ERROR CODES AND MESSAGES
This appendix describes the coding that the SEL-2711 uses to tell the host its status and any error
conditions that may exist. See
Section 4: Operation With SEL-2030
for information on how to
access this information. For information on Modbus Plus error codes, see
Section 3: Operation
and Network Configuration.
S
ELF
-T
EST
F
AILURE
C
ODES
When the SEL-2711 reports an error, it provides both an error code and an error string. The error
code is a binary encoded 16-bit number. The bit positions have the following meanings:
Bit 0: 2711 RAM Checks
0 = RAM OK
1 = RAM Failed
Bit 1: 2711 EEPROM Checks
0 = EEPROM OK
1 = EEPROM Failed
Bit 2: 2711 Flash Checks
0 = Flash OK
1 = Flash Failed
Bit 3: Modbus Plus Dual Port RAM
0 = Dual Port RAM OK
1 = Dual Port RAM Failed
Bit 4: Modbus Plus Peer Processor
0 = Peer Processor OK
1 = Internal Failure in Processor
Bit 5: Cause of Peer Processor Failure
0 = SEL-2711 Firmware
1 = Modbus Plus Hardware
Note: Bit 5 has no meaning if Bit 4 is not set.
Bit 6: Shared Memory Interface Failure
0 = No Error
1 = Interface Failure
Bits 7-9: Modbus Plus Network Condition
000 = Normal Link Operation
001 = Monitor Link Operation
011 = Never Getting Token
010 = Sole Station
101 = Duplicate Station
Bits 10-11: Cause of last SEL-2711 Reset
00 = No Error
01 = Watchdog Timer Expired
10 = Loss of Crystal
Most of these are self-explanatory. Bit 3 indicates the condition of the dual port RAM that makes
up the interface between the SEL-2711 and the Modicon Modbus Plus peer processor.
Bit 4 indicates there is an error in the peer processor. Bit 5 is used to indicate if the error is caused
by the peer processor hardware or the SEL-2711 software.
