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HART Multiplexer Master KFD2-HMM-16
Diagnosis and Fault Elimination
Subject to reasonable modifications due to technical advances.
Copyright Fuchs, Printed in Germany
Fuchs Group • Tel.: Germany (06 21) 7 76-0 • USA (330) 4 25 35 55 • Singapore 7 79 90 91 • Internet http://www.pepperl-fuchs.com
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5.4
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 initialisation 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 "Mal-
function" status message (see section 5.3.3) 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 disap-
peared)
•
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