Causes Of Errors And Remedies For Digital Modules - Siemens SIMATIC S7-400 Reference Manual

4.4.3

Causes of errors and remedies for digital modules

Overview
Table 4-7
Diagnostic message
Module error
Internal error
External error
Channel error
External auxiliary volt‐
age missing
Front connector miss‐
ing
No module
parameters
Incorrect parameters
Channel information
available
STOP mode
Internal voltage failure Module is defective
EPROM error
Hardware interrupt
lost
Parameter assign‐
ment error
Short-circuit to M
Short-circuit to L+
S7-400 Automation System Module Data
Reference Manual, Ausgabe 11/2016, A5E00850736-08
Diagnostic messages of the digital modules, causes of errors and remedies
Possible cause of error
Any, the module has detected an
error.
Module has detected an error within
the automation system.
Module has detected an error out‐
side of the automation system.
Indicates that only certain channels
are faulty.
Voltage required to operate the
module is missing (load voltage,
sensor supply).
Jumper between connections 1 and
2 in the front connector is missing.
Module requires information wheth‐
er it should operate with default sys‐
tem parameters or with your param‐
eters.
One parameter, or the combination
of parameters, is not plausible.
Channel error; module can provide
additional channel information.
No parameters have been as‐
signed to the module and the first
module cycle has not been comple‐
ted.
Module is defective
The module cannot send an inter‐
rupt, since the previous interrupt
was not acknowledged; possible
configuration error.
Incorrect parameters transferred to
the module (for example, impossi‐
ble input delay); the corresponding
channel is deactivated.
Overload at output
Short-circuit of output to M
Short-circuit of output to L+
Digital modules
4.4 Diagnostics for digital modules
Remedy
-
-
-
-
Supply missing voltage
Install jumper
Message queued after power-on until
parameter transmission by the CPU has
been completed; configure the module,
as required.
Reassign parameters to the module
-
If after rebooting the CPU all the input
values are in the intermediate memory,
this message is reset.
Replace the module
Replace the module
Change the interrupt handling in the
CPU (change priority for interrupt OB;
shorten interrupt program).
Reassign parameters to the module
Eliminate overload
Check the wiring of the outputs.
Check the wiring of the outputs.
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