Digital Modules
3-31
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
Causes of error and remedial measures
Table 3-13 Diagnostic Messages of the SM 321; DI 16 x DC 24 V, Causes of Error and
Remedial Action
Diagnostics
Message
Possible Error Cause Remedy
Lack of encoder
Overload of sensor supply Eliminate overload
supply
Short circuit of sensor supply to M Eliminate short circuit
External auxiliary
voltage missing
Power supply L+ to module missing Feed supply L+
Internal auxiliary
Power supply L+ to module missing Feed supply L+
voltage missing
Fuse in module defective Replace module
Fuse blown Fuse in module defective Replace module
Wrong parameters in
module
One parameter or the combination of
parameters is not plausible
Reassign module parameter
Watchdog tripped Temporary high electromagnetic
interference
Eliminate interference
Module defective Replace module
EPROM error Temporary high electromagnetic
interference
Eliminate interference and switch on/off
power supply of CPU
Module defective Replace module
RAM error Temporary high electromagnetic
interference
Eliminate interference and switch on/off
power supply of CPU
Module defective Replace module
Hardware interrupt lost The module cannot send an interrupt,
since the previous interrupt was not
acknowledged; configuration error
possible
Change interrupt processing in CPU
and reconfigure module parameters, if
required
The error continues until the module is
configured with new parameters
Module not
parameterized
Fault during startup Reassign module parameters
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