Siemens S7-300 Installation And Operating Manual page 153

Causes of the problem and corrective measures
The table below shows possible causes of the problem and appropriate corrective measures
for the individual diagnostic messages of SM 326, DO 10 x DC 24V/2A.
Table 8- 22
Diagnostic message Error detection Possible causes of the problem
Wire break
Short-circuit of
output to M, or
defective output
driver
Short circuit of
output to L+, or
defective output
driver
Module parameters
not assigned
Incorrect module
parameters
Internal supply
voltage of the
module failed
Time monitoring
activated
(watchdog)
Fail-safe signal modules
Installation and Operating Manual, 01/2010, A5E00085586-10
8.6 SM 326; DO 10 x DC 24V/2A (6ES7326-2BF01-0AB0)
Diagnostic messages and associated corrective measures for SM 326; DO 10 x DC
24V/2A
Only if the
output = 1
or
during light
period test
Only if the
output = 1
or
during light
period test
Only if "1"
signal is set at
the output
without series
diode
or
at an output
with series
diode and
internal short-
circuit to L+
General
General
General
General
Wire break between the module
and actuator
Channel not connected (open)
At outputs with series diode:
short-circuit between the output
and 1L+ of the module supply
At outputs with series diode:
short-circuit between channels
which carry different signals
Output overload
Short-circuit to M at the output
Undervoltage at load voltage
supply
Defective output driver
Short-circuit of output after 1L+ of
the module power supply
Short-circuit between channels
which carry different signals
Defective output driver
No parameters transferred to
module
Faulty parameters transferred to
module
Internal fault at supply voltage 1L+
Overload due to diagnostics
request (SFCs)
Electromagnetic interference has
exceeded limits
Defective module
Digital modules
Corrective measures
Restore the cable
connection
Disable the "Group
Diagnostics" for the
channel in the
parameter settings.
Eliminate the short-
circuit
Eliminate the short-
circuit
Eliminate the cause of
overload
Eliminate the short-
circuit
Check the load voltage
supply
Replace the module
Eliminate the short-
circuit
Module reset required
(cycle power supply
off/on)
Eliminate the short-
circuit
Module reset required
(cycle power supply
off/on)
Replace the module
Assign new module
parameters
Assign new module
parameters
Replace the module
Reduce the number of
diagnostics requests
Eliminate the
interference
Replace the module
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