Digital modules
8.6 SM 326; DO 10 x DC 24V/2A (6ES7326-2BF01-0AB0)
Fail-safe signal modules
Installation and Operating Manual, 01/2010, A5E00085586-10
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 messages and associated corrective measures for SM 326; DO 10 x DC
24V/2A
Diagnostic message Error detection Possible causes of the problem
Corrective measures
Wire break between the module
and actuator
Restore the cable
connection
Channel not connected (open)
Disable the "Group
Diagnostics" for the
channel in the
parameter settings.
At outputs with series diode:
short-circuit between the output
and 1L+ of the module supply
Eliminate the short-
circuit
Wire break
Only if the
output = 1
or
during light
period test
At outputs with series diode:
short-circuit between channels
which carry different signals
Eliminate the short-
circuit
Output overload
Eliminate the cause of
overload
Short-circuit to M at the output
Eliminate the short-
circuit
Undervoltage at load voltage
supply
Check the load voltage
supply
Short-circuit of
output to M, or
defective output
driver
Only if the
output = 1
or
during light
period test
Defective output driver
Replace the module
Short-circuit of output after 1L+ of
the module power supply
Eliminate the short-
circuit
Module reset required
(cycle power supply
off/on)
Short-circuit between channels
which carry different signals
Eliminate the short-
circuit
Module reset required
(cycle power supply
off/on)
Short circuit of
output to L+, or
defective output
driver
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+
Defective output driver
Replace the module
Module parameters
not assigned
General
No parameters transferred to
module
Assign new module
parameters
Incorrect module
parameters
General
Faulty parameters transferred to
module
Assign new module
parameters
Internal supply
voltage of the
module failed
General
Internal fault at supply voltage 1L+ Replace the module
Overload due to diagnostics
request (SFCs)
Reduce the number of
diagnostics requests
Electromagnetic interference has
exceeded limits
Eliminate the
interference
Time monitoring
activated
(watchdog)
General
Defective module
Replace the module
