String (Modbus/TCP Protocol)
The string format is packed ASCII (2 characters per word). In some systems, the character order may appear
reversed or out of order. For example, the word “System” may read out as “yStsme”. Use "
Swap character bytes
"
option under the Advanced menu in the Network Settings window to swap characters so words read correctly.
While the string length is provided, it is usually not required for Modbus/TCP systems. If string length is used for
Modbus/TCP, the length format corresponds to the settings used for EtherNet/IP.
Timestamp
The time, in seconds, when the fault occurred since power up.
Virtual Status Output
The reference designator associated with a particular Virtual Status Output, for example, VO10 is Virtual Status
Output 10.
VO Status
This identifies the location of a bit indicating the status of a Virtual Status Output. In the case of Modbus/TCP, the
state of the Virtual Status Output can be read as a discrete input, as part of an input register, or holding register.
The register given is the offset from 30000 or 40000 followed by the bit location within the register.
9.8.4 Fault Log Support Tables
Modbus/TCP 3X/4X
Fault Log Type Length (Words) Starting Register
Fault log entry 1 (most recent)
See Fault Log Entry table below
15 233
Fault log entry 2 15 248
Fault log entry 3 15 263
Fault log entry 4 15 278
Fault log entry 5 15 293
Fault log entry 6 15 308
Fault log entry 7 15 323
Fault log entry 8 15 338
Fault log entry 9 15 353
Fault log entry 10 (oldest) 15 368
Fault Log Entry Type Length (Words)
Timestamp UDINT 2
Name Length DWORD 2
Name String String 6
Error Code WORD 1
Advanced Error Code WORD 1
Error Message Index WORD 1
Reserved WORD 2
System Information Type Length (Words) Starting Register
Seconds since boot UDINT 2 383
Operating mode WORD 1 385
LengthOfConfigName DWORD 2 386
ConfigName String 8 388
Config CRC WORD 2 396
XS/SC26-2 and SC10-2 Safety Controllers
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