Siemens S7-300 Installation And Operating Manual page 260

Analog modules
9.3 SM 336; F-AI 6 x 0/4 ... 20 mA HART
Diagnostic message
EPROM error
RAM error
ADC/DAC error
Firmware update successfully
performed
Firmware update error
Firmware version inconsistent
Discrepancy error
Short-circuit
(short-circuit to L+ of sensor
supply, ground short-circuit or
defective sensor supply)
Wire break
260
Possible causes of the problem
Excessive electromagnetic interference
at times
Defective module
Inconsistent firmware
Internal error during analog value test
Impermissible U
CM
—
Firmware is faulty

CRC error

Defective module
Firmware is faulty

Firmware update was canceled

Supply voltage of module is missing
Assigned tolerance window exceeded on
expiration of the discrepancy time
Wiring incorrect
Applied external voltage
Defective module
Interruption of the measuring lead
between the module and sensor
Incorrect measuring range setting
Corrective measures
Eliminate the interference, and
Switch the supply voltage of the F-

CPU/IM OFF/ON,
Remove/insert F-SM, or

Switch external auxiliary voltage of F-

SM OFF/ON
Replace the module
Repeat firmware update
Replace the module
Eliminate the interference, and
Switch the supply voltage of the F-

CPU/IM OFF/ON,
Remove/insert F-SM, or

Switch external auxiliary voltage of F-

SM OFF/ON
—
Switch the supply voltage of the F-

CPU/IM OFF/ON,
Remove/insert F-SM, or

Switch external auxiliary voltage of F-

SM OFF/ON
Then, repeat the firmware update.
Replace the module
Repeat the firmware update.
Connect the module to the supply
voltage, and repeat the firmware update.
Extend the tolerance window and/or
discrepancy window
Check wiring, and
Switch the supply voltage of the F-

CPU/IM OFF/ON,
Remove/insert F-SM, or

Switch external auxiliary voltage of F-

SM OFF/ON
Remove the external voltage effect, and
Switch the supply voltage of the F-

CPU/IM OFF/ON,
Remove/insert F-SM, or

Switch external auxiliary voltage of F-

SM OFF/ON
Replace the module
Restore the cable connection
Check the measuring range setting
Installation and Operating Manual, 01/2010, A5E00085586-10
Fail-safe signal modules