Cerabar PMP21 IO-Link Diagnosis and troubleshooting
Endress+Hauser 37
10 Diagnosis and troubleshooting
10.1 Troubleshooting
If an invalid configuration exists in the device, the device switches to the fault state.
Example:
• The diagnostic message "C485" is displayed via IO-Link.
• The device is in the simulation mode.
• If the device configuration is corrected, e.g. by resetting the device, the device quits the
fault state and switches to the measuring mode.
General faults
Fault Possible cause Remedial action
Device does not respond. Supply voltage does not match the voltage
specified on the nameplate.
Connect the correct voltage.
The polarity of the supply voltage is wrong. Correct the polarity.
The cables do not contact the terminals properly. Check the electrical contact
between the cable and
terminals and correct if
necessary.
No communication • Communication cable not connected.
• Communication cable incorrectly attached to
device.
• Communication cable incorrectly attached to
the IO-Link master.
Check wiring and cables.
Output current
≤ 3.6 mA
Signal line is not wired correctly. Check wiring.
No transmission of process
data
There is an error in the device. Correct errors that are
displayed as a diagnostic
event.
10.2 Diagnostic events
10.2.1 Diagnostic message
Faults detected by the self-monitoring system of the measuring device are displayed as a
diagnostic message in alternation with the measured value display via the IODD.
Status signals
The table ("List of diagnostic events" section) lists the messages that may occur. The
ALARM STATUS parameter shows the message with the highest priority. The device has
four different status information codes according to NE107:
Failure
A device error has occurred. The measured value is no longer valid.
Maintenance required
Maintenance is required. The measured value remains valid.
Check function
The device is in service mode (e.g. during a simulation).
Out of specification
The device is being operated:
• Outside its technical specifications (e.g. during startup or cleaning)
• Outside the configuration performed by the user (e.g. level outside the configured range)
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