4.4.3
Causes of errors and remedies for digital modules
Overview
Table 4-7
Diagnostic messages of the digital modules, causes of errors and remedies
Diagnostic message
Possible cause of error
Remedy
Module error
Any, the module has detected an
error.
-
Internal error
Module has detected an error within
the automation system.
-
External error
Module has detected an error out‐
side of the automation system.
-
Channel error
Indicates that only certain channels
are faulty.
-
External auxiliary volt‐
age missing
Voltage required to operate the
module is missing (load voltage,
sensor supply).
Supply missing voltage
Front connector miss‐
ing
Jumper between connections 1 and
2 in the front connector is missing.
Install jumper
No module
parameters
Module requires information wheth‐
er it should operate with default sys‐
tem parameters or with your param‐
eters.
Message queued after power-on until
parameter transmission by the CPU has
been completed; configure the module,
as required.
Incorrect parameters
One parameter, or the combination
of parameters, is not plausible.
Reassign parameters to the module
Channel information
available
Channel error; module can provide
additional channel information.
-
STOP mode
No parameters have been as‐
signed to the module and the first
module cycle has not been comple‐
ted.
If after rebooting the CPU all the input
values are in the intermediate memory,
this message is reset.
Internal voltage failure Module is defective
Replace the module
EPROM error
Module is defective
Replace the module
Hardware interrupt
lost
The module cannot send an inter‐
rupt, since the previous interrupt
was not acknowledged; possible
configuration error.
Change the interrupt handling in the
CPU (change priority for interrupt OB;
shorten interrupt program).
Parameter assign‐
ment error
Incorrect parameters transferred to
the module (for example, impossi‐
ble input delay); the corresponding
channel is deactivated.
Reassign parameters to the module
Short-circuit to M
Overload at output
Eliminate overload
Short-circuit of output to M
Check the wiring of the outputs.
Short-circuit to L+
Short-circuit of output to L+
Check the wiring of the outputs.
Digital modules
4.4 Diagnostics for digital modules
S7-400 Automation System Module Data
Reference Manual, Ausgabe 11/2016, A5E00850736-08
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