Digital modules
8.7 SM 326; F-DO 10 x DC 24V/2A PP (6ES7326-2BF10-0AB0)
Fail-safe signal modules
Installation and Operating Manual, 01/2010, A5E00085586-10
175
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, F-DO 10 x DC 24V/2A PP.
Table 8- 26 Diagnostic messages and associated corrective measures for SM 326; F-
DO 10 x DC 24V/2A PP
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.
Short-circuit to L+ at the output Eliminate the short-
circuit
Wire break Only if the
output = 1
or
during light
period test
Short-circuit between channels
which carry different signals
Eliminate the short-
circuit
Output overload Remove the overload
within 100 hours after
the fault has occurred.
Short-circuit to M at the output Remove the short circuit
within 100 hours after
the fault has occurred.
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 to L+ at the output Remove the short circuit
within 100 hours after
the fault has occurred.
Module reset required
(cycle power supply
off/on)
For non-
redundant
operation
Short-circuit between channels
which carry different signals
Remove the short circuit
within 100 hours after
the fault has occurred.
Module reset required
(cycle power supply
off/on)
Short circuit of
output to L+, or
defective output
driver
general 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
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