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IP258
54
Control unit Status Messages
Further operational alarm/error messages are shown on the LCD when any display parameter is
selected. When either Readings or Diagnostic parameters (D200 - D265) are shown, the SMART
Communicator is interrogating the MSM400 control unit every 0.5 seconds, and the information returned
includes various message signals concerning the current status of the returned echo. These messages are
displayed on the LCD line 2 for two seconds when the condition is first detected, instead of the Display
parameter value. After this display period the condition message is abbreviated to a two letter code
shown on the right hand side of the LCD, as long as the condition persists These status messages are
updated every 10 seconds. Only one status message is displayed at a time, in a priority order, as listed
below, to see all the alarms present use P520 - P525.
CURRENT SATURATED (CS)
The echo currently monitored is from a process value outside the pre-programmed 4-20mA range, so
the current is either at 4mA or 20mA and is possibly not valid.
TEMPERATURE LIMIT (TL)
This indicates that the process temperature or a combination of the process and ambient temperatures
have resulted in the electronics becoming too hot or too cold. Using the HHC, check P523 to see the
maximum and minimum temperatures recorded. If the MSM400 electronics has recorded a temperature
above 55°C then the electronics may have been permanently damaged. The MSM400 should be
returned to Mobrey Measurement or your local agent for repair or replacement.
There are also various microprocessor fault messages which should be shown on the LCD, indicating
significant problems with the sensor microprocessor. For all these error conditions reference should be
made to the factory, and it will probably be necessary to return the unit for repair. The messages and
codes are:
ROM CHECKSUM RC
EEPROM SIGNATURE ES
EEPROM CHECKSUM EC
RAM TEST RT
When an Unknown instrument is being interrogated, a universal set of error messages is used:
DEVICE MALFUNCTION DV
PV OUT OF LIMITS PL
NON PV OUT OF LIMITS NL
CURRENT SATURATED CS
D.10.2Invalid Data Entry
When the Operator tries to enter a command or parameter value which is invalid, the message on the
screen will indicate this. Typical messages occur as follows:
“INVALID INPUT” (Rejected by the Psion Organiser)
“INVALID DATA” (Rejected by the MSM400 control unit)
- Parameter value entered is outside the limits allowed for that parameter, or resetting of this
parameter is not allowed as per the data entered.
“IN WRITE PROTECT MODE”
- The Password is “Closed” or does not allow access to this parameter.
“INVALID PARAMETER NUMBER”
- Parameter number entered is not known by MSM400.