Digital modules
8.6 SM 326; DO 10 x DC 24V/2A (6ES7326-2BF01-0AB0)
Fail-safe signal modules
154 Installation and Operating Manual, 01/2010, A5E00085586-10
Diagnostic message Error detection Possible causes of the problem Corrective measures
Error in communication between
the CPU and the module, for
example, due to defective
PROFIBUS connection or
electromagnetic interference in
excess of limits.
Check the PROFIBUS
connection
Eliminate the
interference
Timeout of data frame monitoring Check the monitoring
time parameters
CRC signature error, for example,
due to electromagnetic interference
in excess of limits.
Eliminate the
interference
Communication
error
General
CPU is in STOP Read the diagnostics
buffer
Electromagnetic interference has
exceeded limits
Eliminate the
interference and cycle
power supply OFF/ON
EPROM error
RAM error
General
Defective module Replace the module
Internal error in
read / test
sequence
General Defective module Replace the module
Electromagnetic interference has
exceeded limits
Eliminate the faults, and
then remove and insert
the module
Defective module Replace the module
Processor failure General
Switching rate exceeded Reduce switching rate
Parameter
assignment error
(with specification of
a consecutive
number)
General Error in dynamic parameter
reassignment
Check the parameter
assignment in the user
program. Contact
SIMATIC Customer
Support if necessary
No external
auxiliary voltage
General Supply voltage 1L+ of module
missing
Connect 1L+
External load
voltage missing
General Supply voltage 1L+ of module
missing
Feed in voltage supply
Defective main
switch
General Defective module Replace the module
Defective output
driver
General Defective module Replace the module
Output overload Eliminate the cause of
overload
Overtemperature at
output driver
General
Internal fault at output driver Replace the module
Load voltage 2L+, 3L not
connected
Connect 2L+ and 3L+ Defective load
voltage or load
voltage not
connected
General
Load voltage external error Replace the module
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