HART Multiplexer System KFD*-HM*-16
Diagnosis and fault elimination
DO
C
T-0
120D
06/
2014
56
8.4
Extended device status
The extended device status can be called up via command 48. It provides five bytes
of information, which are thematically arranged:
1st Byte
Operation in progress
The Byte indicates which operation is in progress. The information is coded bit by bit.
The coding is shown in the following table:
2nd Byte
Hardware fault
This Byte, which is also bit by bit coded, indicates any hardware faults that have
been found. Hardware faults are only detected during the initialization sequence after
the power supply has been switched on.
3rd Byte
SCAN error
The Byte indicates an OR logic operation for all errors that have been detected
during the SCAN function.
Example: If a field device has been detected as having
disappeared
and another as
mismatched
, then these two Bits are set simultaneously.
The bit by bit coded information is shown in the following table:
Bit
Operation in progress
Meaning
7
Reset
Start-up sequence running and must be completed.
6
REBUILD
REBUILD function is running and must be completed.
5
internal EEPROM write function
Switching off the power supply can result in loss of the parameter
assignment.
4
SCAN
SCAN function is running and must be completed.
3
Self test (command 41)
The device self test is executed (as when the power supply is
switched on); if no error occurs, the "Malfunction" status message
(see section 8.3.3) clears (if it is set).
2 ... 0
reserved
Reserved.
Bit
Detected hardware fault
Meaning/remedial action
7
Current loop
OR logic operation on all detected hardware faults in the current
loops. Check the transmitter and its cabling, then execute
REBUILD.
6
ROM error
Send device to Fuchs for repair.
5
EEPROM error
Send device to Fuchs for repair.
4 ... 0
reserved
Reserved.
Bit
State
Meaning
Corrective action
7
reserved
Reserved.
6
Searching
Transmitter is searched for (due to
having disappeared).
• Check cabling.
• Check transmitter.
5
Disappeared
Transmitter no longer responds.
4
Appeared
Transmitter responds again.
Check cabling.
3
Mismatched
Despite this, another transmitter has
responded.
Transmitter has been exchanged for
another type. Check type, rebuild loop.
2 ... 0
reserved
Reserved.
