Read Back Failure; Overload; Supply Voltage Too High Supply Voltage Too Low - Siemens SIMATIC S7-1500 Manual

Interrupts/diagnostic messages
6.3 Diagnostic alarms
Diagnostic alarm

Read back failure

Overload

Supply voltage too high
Supply voltage too low
Supply voltage outside the nominal range
If the supply voltage L+ is outside the specified value range, the ERROR LED flashes and
the module is passivated.
When the voltage is then recovered (level must remain within the specified value for at least
1 minute, see Technical specifications (Page 51)), the ERROR LED stops flashing. The
module remains passivated and waits for user acknowledgment.
Generally applicable information on diagnostics
Information on diagnostics that pertains to all fail-safe modules (for example, readout of
diagnostics functions or passivation of channels) is available in the SIMATIC Safety –
Configuring and Programming
(http://support.automation.siemens.com/WW/view/en/54110126) manual.
50
Fault Meaning
code
798 The F-module has detected an internal
D
error.
You must eliminate the error within 100
hours; otherwise, the F-module is perma-
nently passivated and an acknowledg-
ment is no longer possible.
Possible causes:
Impermissibly high electromagnetic
•
interference is present.
The capacitive load is too high.
•
The F-module has detected an inter-
•
nal error and has reacted in a safety-
related manner.
800 The maximum permissible output current
D
has been exceeded. The output stage
has been switched off.
You must eliminate the error within 100
hours; otherwise, the F-module is perma-
nently passivated and an acknowledg-
ment is no longer possible.
Possible causes:
A short-circuit exists.
•
The connected load is too high.
•
801 The supply voltage is too high.
D
802 The supply voltage is too low.
D
•
•
•
•
Check the supply voltage.
Check the supply voltage.
Digital output module F-DQ 8x24VDC/2A PPM (6ES7526-2BF00-0AB0)
Remedy
Increase the test times (dark, light,
switch-on tests).
If the error continues, consider
replacing the F-module.
Check the process wiring.
Reduce the load or the load cur-
rent.
Manual, 01/2016, A5E03858037-AA