Status Indicator; Troubleshooting Chart - Siemens SIMATIC 505 PPX:505–6108A User Manual

3.1

Status Indicator

3-2 Troubleshooting and Maintenance
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The LED status indicator and the programming device indicate whether the
module is operating correctly. Table 3-1 lists symptoms, possible causes, and
corrective actions to take if the module is not operating correctly.
Table 3-1 Troubleshooting Chart
Symptom Probable Cause
LED is not on Not receiving user
power—output module
only
Blown fuse—output
module only
Self-diagnostics fail
Base power is off
Incorrect readings Connections wrong
Signal wire noise
Module not configured
Module incorrectly
calibrated
Signal source
error—input module only
CPU nonfatal Module configured wrong
error because of
Module failed
module
Corrective Action
Check power supply and
connections
Check for overvoltage or
reversed polarity; replace fuse
Return module for repair
Turn base power on
Trace wiring connections
Use shielded wire and separate
from power wiring
Check I/O configuration
Recalibrate the module
Verify that signal source levels
are in range (Figure 1-4)
Reconfigure the module
Check items under LED is not
on; if the actions listed do not
correct the problem, return the
module for repair
Series 505 Analog I/O Modules User Manual