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8. Error signalling
To monitor availability, comprehensive system diagnostic functions have been integrated to
signal various errors:
1. Serious errors (ERR):
Serious errors (ERR) always set the current output to the configured alarm value. Technical
problems affecting the sensor or the entire system that require replacement or repair of a
component are displayed:
•
Failure of the communication to a sensor (sensor failure)
•
Failure of a subcomponent of a sensor (temperature monitoring, heater control, memory,
data consistency, etc. on the sensor)
•
Inconsistent signal paths in the sensor (amplifier stages, DC offsets)
2. Process indicators (PROC):
Process indicators (PROC) merely report a violation of set parameters and should be viewed as
information to improve the measurement process.
Process indicators are not output at the current output, however they can be shown on the
display (field housing) or the RUN LED (DIN Rail) and optionally on the relay:
•
Temperature instability in the sensor due to external thermal stress (overtemperature, low
temperature)
•
Overload of the sensor due to material flow (too much, too little)
Process indicators
may also only show temporary abnormalities in the process, which can be
prevented by optimising the sensor or delivery parameters.
Process indicators are not sensor errors, but rather provide information about optimisation potential
at the measuring point.
Display
Display
(field housing)
Run LED
(DIN Rail)
Relay
(optional)
Current output
No error
Sensor status OK
in the information
display ([I] key)
Single flashing
every second
Normal status
4 ... 20 mA
PROC
(Process
indicators)
Display with indi-
cator code in the
bottom display
line, extended
information via [I]
key
Double flashing
every second
Enabled if relay
alarm option
PROC is selected
4 ... 20 mA
ERR
(Hardware
error)
Display with error
code in the bot-
tom display line,
extended informa-
tion via [I] key
Triple flashing
every second
Enabled if relay
alarm option
PROC or ERR is
selected
2 mA (or alarm
value set for the
current output)
Error codes:
Error and indicator codes are composed of the letter E (ERR = error) or P (PROC = process
indicator) and a three-digit hexadecimal value from “000” to “FFF”. The cause can be determined via the
displayed code.
Error timeout:
In order not to complicate the start-up of a processing plant due to process and heating
status errors, non-serious errors are only signalled at the outputs after approx. 5 minutes have elapsed
following a reset of the measuring system. The timeout delay is indicated by a small "t" in the upper-left
corner of the display (field housing only).
