Siemens S7-300 Installation And Operating Manual page 261

Diagnostic message
Overflow or underflow of the
measured value (see "Wire break
and underflow") in Chapter "Analog
value representation (Page 222)")
Communication error
HART: Primary variable outside the
limits
HART: Non-primary variable
outside the limits
HART: Analog output current
saturated
Fail-safe signal modules
Installation and Operating Manual, 01/2010, A5E00085586-10
Possible causes of the problem
Measuring range fallen below
Measuring range exceeded
Current through sensor too high at
startup
Error in communication between the CPU
and the module, for example, due to
defective PROFIBUS connection or
electromagnetic interference in excess of
limits
Timeout of safety message frame
monitoring
CRC signature error, for example, due to
electromagnetic interference in excess of
limits or standard program accessing F-
SM.
F-CPU has gone into STOP mode
Inconsistent parameter assignment in
HW Config
and F-program
Assigned primary variable is outside

the limits
Incorrect parameters in the HART

field device
HART field device has simulation,

and simulation setting is "Primary
variable outside the limits"
Assigned non-primary variable is

outside the limits
Incorrect parameters in the HART

field device
HART field device has simulation,

and simulation setting is "Non-primary
variable outside the limits"
Incorrect parameters in the HART

field device
HART field device has simulation,

and simulation is set to a measured
value that is too high
Assigned primary variable is outside

the limits
9.3 SM 336; F-AI 6 x 0/4 ... 20 mA HART
Corrective measures
Use suitable sensor,

check wiring (sensor polarity

reversed)
Check sensor setting

Use a suitable sensor; sensor polarity
reversed
—
Check the communication connection
Eliminate the interference
Check the monitoring time parameters
Eliminate the interference
Read out the diagnostic buffer of the
F-CPU
Recompile the project and download the
S7 program again.
Check the parameter assignment of

the HART field device
Correct/deactivate simulation

Check whether the correct sensor is

connected
End the measuring circuit test

Analog modules
261