Diagnosis and troubleshooting Cerabar PMP21 IO-Link
40 Endress+Hauser
Status
signal/
Diagnostic
event
Diagnostic
behavior
EventCode Event text Cause Remedial measure
S971 Warning 0x1811 Measured value is
outside sensor range
The current is outside the permitted
range from 3.8 to 20.5 mA.
The present pressure value is
outside the configured measuring
range (but may be within the sensor
range).
Operate the device within the set span
F419 Fault - Back-2-Box command
has been executed.
IO-Link communication no longer
available.
Manual restart is necessary.
1) The switch output is open and the current output adopts the configured alarm current. Therefore, errors affecting the switch output are not
displayed because the switch output is in the safe state.
2) The device indicates a failure current of 0 mA if an internal communication error occurs. In all other cases the device returns the configured error
current.
3) If no remedial measures are taken, the warning messages are displayed following a device restart if configuration (span, switch points and offset)
is performed with a gauge pressure device and readings are > URL + 10 % or < LRL + 5 % and with an absolute pressure device and readings are >
URL + 10% or < LRL.
4) EventCode as per IO-Link standard 1.1
10.3 Behavior of the device in the event of a fault
The device displays warnings and faults via IO-Link. All the device warnings and faults are
for information purposes only and do not have a safety function. The errors diagnosed by
the device are displayed via IO-Link in accordance with NE107. Depending on the
diagnostic message, the device behaves as per a warning or fault condition. A distinction
must be made between the following types of error here:
• Warning:
• The device continues measuring if this type of error occurs. The output signal is not
affected (exception: simulation is active).
• The switch output remains in the state defined by the switch points.
• Fault:
• The device does not continue measuring if this type of error occurs. The output signal
adopts its fault state (value in the event of an error - see the following section).
• The fault state is displayed via IO-Link.
• The switch output changes to the "open" state.
• For the analog output option, an error is signaled with the configured alarm current
behavior.
10.4 Behavior of the current output in the event of a fault
The behavior of the current output in the event of a fault is regulated in accordance with
NAMUR NE43.
The behavior of the current output in the event of faults is defined in the following
parameters:
• Alarm current FCU "MIN": Lower alarm current (≤3.6 mA) (optional, see the following
table)
• Alarm current FCU "MAX" (factory setting): Upper alarm current (≥21 mA)
• The selected alarm current is used for all errors.
• It is not possible to acknowledge errors and warnings. The relevant message
disappears if the event is no longer pending.
• The failsafe mode can be changed directly when a device is running (see the
following table).
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