Special Signal modules
5-19
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
Causes of errors and remedial measures
Table 5-6 Diagnostics Messages of the SM 338, Causes of Errors and Remedial Measures
Diagnostics
Message
Possible Error Cause Remedy
Module fault An error detected by the module has
occurred.
Internal error Module has detected an error within
the automation system.
External error Module has detected an error outside
of the automation system.
Channel error present Indicates that only specific channels
are faulty.
External auxiliary
supply missing
The power supply L+ to the module is
missing
Feed supply L+
Module not
parameterized
Module requires information whether it
should work with parameters preset by
the system or with your parameters.
Message present after network active
until transfer of the parameters by the
CPU complete; parameterize module if
necessary.
Wrong parameters One parameter or the combination of
parameters is not plausible
Reassign module parameter
Channel information
present
Channel error present; module can
provide additional channel information.
Watchdog tripped Temporary high electromagnetic
interference
Eliminate interference
Channel error present An error detected by the module has
occurred at the encoder input.
Configuration /
parameterization error
Illegal parameter had been transferred
to module
Reassign module parameter
External channel error
(encoder error)
Broken wire in encoder cable, encoder
cable not connected or encoder
defective.
Check connected encoder
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