Diagnostics and troubleshooting
11
11.1
Device status symbols
Device status is shown using symbols on the local display. Additionally, the symbol and
respective text message for each device status can be seen in remote engineering, asset
management or process control systems.
Locally, alarms are shown as a symbol in the lower line of the display. If several diagnostic states
are active at the same time, the symbol for the most critical state is shown.
Device status characteristics
The following table provides possible cause of device status and actions for the user or service.
The symbols used on the local display are based on NAMUR status signals, whereas symbols used
in SIMATIC PDM are based on Siemens standard alarm classes.
Note
Device status priority conflict - Namur vs Siemens standard
When more than one diagnostic event is active simultaneously, a conflict in priorities may arise.
In this case, the Namur symbol on the local display will differ from that shown in SIMATIC PDM.
• For example: if both diagnostic states "Maintenance demanded" and "Configuration error"
are active,
– Local display (using Namur symbols) will show "Configuration error" as higher priority.
– SIMATIC PDM (using Siemens standard symbols) will show "Maintenance demanded" as
higher priority.
Be aware of the priority for each device status, depending on the interface used.
Note
Namur device status priorities
This device uses Namur device status priorities based on HCF specification.
The sequence of symbols in the table corresponds to the priority of the device status, beginning
with the most critical.
Device status symbols
Display
– NAMUR NE 107
NAMUR
– HCF
SIMATIC PDM/PLC
Symbol
Device status
Priority *
Symbol
Device status
Priority *
Failure
1
Maintenance alarm
1
Cause: Output signal invalid due to fault in the field device or in the peripherals.
Measure: Maintenance is required immediately.
SITRANS TH100/TH320/TH420/TR320/TR420/TF320/TF420 with 4 to 20 mA/HART
Operating Instructions, 05/2020, A5E41864807-AB
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