Analog modules
9.2 SM 336; AI 6 x 13 Bit
Fail-safe signal modules
216
Installation and Operating Manual, 01/2010, A5E00085586-10
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 336; AI 6 x 13Bit.
Table 9- 12 Diagnostic messages and associated corrective measures for SM 336; AI 6 x 13Bit
Diagnostic message
Possible causes of the problem
Corrective measures
Interruption of the measuring lead
between the module and sensor
Reestablish the cable connection
Wire break (only in the 4 to
20 mA measuring range)
Incorrect measuring range setting Set the 4 to 20 mA measuring
range
Assigned tolerance window
exceeded on expiration of the
discrepancy time
Extend the tolerance window
and/or discrepancy window
Wire break
Eliminate the wire break Check
the process signal.
Discrepancy error
Deviation between two inputs
outside limits of safety mode to
SIL 2
Wiring error: wire the analog
signal to both inputs, or replace
the module
Common mode fault
Potential difference U
CM
between
the inputs (M-) and reference
potential of measuring circuit
(M
ANA
) too high.
Interconnect M- with M
ANA
Measuring range fallen below
Use a suitable sensor; check the
wiring (sensor polarity reversed)
Measuring range exceeded
Use a suitable sensor; sensor
polarity reversed
Overflow or underflow of the
measured value (see "Wire
break and underflow") in
representation (Page 182)")
Current through sensor too high at
startup
—
Incorrect module parameters Faulty parameters transferred to
module
Assign new module parameters
Parameter assignment error
(with specification of a
consecutive number; for
example, "16": incorrect
address)
Error in dynamic parameter
reassignment
Check the parameter assignment
in the user program
Contact SIMATIC Customer
Support if necessary
Internal error during analog value
test
ADC/DAC error
Internal voltage monitoring has
reported a fault
Replace the module
No external auxiliary voltage Module supply voltage L+ missing Connect supply voltage L+
