Causes of errors and remedies for analog input modules
Table 5-44
Diagnostic messages of the analog input 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 au‐
tomation system.
-
External error
Module has detected an error outside of the
automation system.
-
Channel error
Indicates that only certain channels are faul‐
ty
-
External auxiliary voltage
missing
Load voltage to supply the 2-wire transduc‐
er is missing on terminals L+ and M.
Connect supply L+
Front connector missing
Jumper between connections 1 and 2 in the
front connector is missing.
Install jumper
No module parameters
Module requires information whether it
should operate with default system param‐
eters or with your parameters.
Message present after power on, until the CPU
has completed the transfer of parameters; config‐
ure the module as required.
Incorrect parameters
A parameter or combination of parameters
is incorrect; impermissible measurement
range, for example.
Reassign parameters to the module
Channel information availa‐
ble
Channel error; module can provide addi‐
tional channel information.
-
Measuring range module
incorrect/missing
One or more measuring range modules is
missing or incorrectly inserted
Insert the measuring range modules on the mod‐
ule according to the parameter assignment of the
type of measurement and the measurement
range
STOP mode
No parameters have been assigned to the
module and the first module cycle has not
been completed.
If a reboot of the CPU all the digitized analog val‐
ues are in the intermediate memory, this mes‐
sage is reset
EPROM error
Module is defective
Replace the module
RAM error
ADC/DAC error
Hardware interrupt lost
The module cannot send an interrupt, since
the previous interrupt was not acknowl‐
edged; possible configuration error.
Change the interrupt handling in the CPU
(change priority for interrupt OB; shorten interrupt
program).
Configuration / program‐
ming error
Illegal parameters transferred to module
Check the measuring range module
Reassign parameters to the module
Short-circuit to M
A short-circuit to the M potential has occur‐
red on the sensor supply of 2-wire trans‐
ducers.
Eliminate the short-circuit.
Wire break
Resistance of transducer circuit too high
Use a different type of transducer, or modify the
wiring, for example, using a larger conductor
cross-section.
Open circuit between module and sensor
Connect the cable
Channel not connected (open)
Disable channel ("Measuring type" parameter)
Wire the channel
Analog modules
5.17 Diagnostics functions of analog modules
S7-400 Automation System Module Data
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