Siemens S7-300 - Page 11

11
Product Information on the Manual S7-300 Module Specifications, Edition 11/2002
A5E00213444-02
Causes of errors and remedial action
Table 6 Diagnostic messages of the SM 321; DI 16 DC 24 V, causes of errors and
remedial action
Diagnostics
Message
Possible Error Cause Remedy
Missing sensor supply Overload of sensor supply Eliminate overload
Short circuit of sensor supply to M Eliminate short circuit
External auxiliary
supply missing
Power supply L+ to module missing Feed supply L+
Internal auxiliary Power supply L+ to module missing Feed supply L+
supply missing
Fuse in module defective Replace module
Fuse blown Fuse in module defective Replace module
Incorrect parameters
in module
One parameter or the combination of
parameters is not plausible
Reassign module parameter
Time monitoring
triggered (watch dog)
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; possible configuration
error
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
Problem at startup Reassign module parameter