Causes Of Error And Troubleshooting At Analog Input Modules; Causes Of Error And Troubleshooting At Analog Output Modules - Siemens SIMATIC Manual

5.8.3

Causes of error and troubleshooting at analog input modules

Overview of the causes of error and troubleshooting at analog input modules
Table 5- 46 Diagnostics messages of analog input modules, causes of error and troubleshooting
Diagnostics message
External load voltage miss-
ing
Configuration / program-
ming error
Common-mode error
Wirebreak
Underflow
Overflow
5.8.4

Causes of error and troubleshooting at analog output modules

Overview of the causes of error and troubleshooting routines at analog output modules
Table 5- 47 Diagnostics messages of analog output modules, causes of error and troubleshooting
Diagnostics message
External load voltage miss-
ing
Configuration / program-
ming error
Short-circuit to M
Wirebreak
S7-300 Module data
Manual, 06/2017, A5E00105505-AJ
Possible cause of error
Load voltage L+ of module missing
Faulty parameters transferred to module
Potential difference C between inputs M-
MV
and the reference potential of measuring
circuit (M out of limits)
ANA
Resistance of transducer circuit too high
Open circuit between module and sensor
Channel not connected (open)
Input value below undershoot range; pos-
sible cause of error:
wrong measuring range setting
polarity reversal of the sensor wiring in the
measuring ranges 4 to 20 mA and 1 to 5 V
Input value exceeds overshoot range
Possible cause of error
Load voltage L+ of module missing
Faulty parameters transferred to mod-
ule
Overload at output
Short-circuit at output Q
V
Actuator impedance too high
Wire-break between the module and
actuator
Channel not used (open)
To correct or avoid errors
Connect supply L+
Check the measuring range module
Program the module
Connect M- with M
Use a different type of sensor, or modify the
wiring, for example, using a larger conductor
cross-section.
Connect the cable
Disable the channel group ("measuring method"
parameter)
Wire the channel
program a different measuring range
Check the connections
program a different measuring range
To correct or avoid errors
Connect supply L+
Assign new module parameters
Eliminate overload
to M Eliminate the short-circuit
ANA
Use a different type of actuator, or modify the wiring
using cables with a larger conductor cross-section
Connect the cable
Disable the channel group ("output type" parameter)
Principles of analog modules
5.8 Diagnostics of analog modules
ANA
297