Signal On Alarm 4 To 20 Ma; Behavior Of The Device In The Event Of A Voltage Drop - Endress+Hauser Ceraphant PTC31B IO-Link Operating Instructions Manual

Diagnosis and troubleshooting
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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 local display alternates between the warning and the main measured value.
• The switch outputs remain in the state defined by the switch points.
• The status LED flashes red (not for IO-Link).
• The background remains white in the event of a warning
• 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 fault state is indicated on the local display.
• The switch outputs assume the "opened" state.
• For the analog output option, an error is signaled with the configured alarm current
behavior.
10.4

Signal on alarm 4 to 20 mA

The response of the output to error is regulated in accordance with NAMUR NE 43.
The behavior of the current output in the event of errors 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)
• Alarm Current FCU "HLD" (HOLD) (optional, see the following table): Last measured
current value is held. When the device starts, the current output is set to "Lower alarm
current" (≤3.6 mA).
• The selected alarm current is used for all errors.
• Errors and warning messages are displayed via IO-Link.
• Errors and warning messages are displayed only on the primary value page
(topmost display level) and are not displayed in the operating menu.
• In the operating menu the error is only indicated by the color of the display
background.
• The status LED always indicates an error.
• 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).
Changing the failsafe mode
from MAX to MIN
from MIN to MAX
from HLD (HOLD) to MAX
from HLD (HOLD) to MIN
from MIN to HLD (HOLD)
from MAX to HLD (HOLD)
10.5

Behavior of the device in the event of a voltage drop

A diagnostic message is not output. The configuration and the settings made are retained.
Ceraphant PTC31B, PTP31B, PTP33B IO-Link
After confirming with 
active immediately
active immediately
active immediately
active immediately
active outside the fault state
active outside the fault state
Endress+Hauser