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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:
Bit
7
Reset
6
REBUILD
5
Internal EEPROM write function
4
SCAN
3
Self test (command 41)
2 ... 0
Reserved
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.
Bit
Detected hardware fault
7
Current loop
6
ROM error
5
EEPROM error
4 ... 0
Reserved
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
State
7
Reserved
6
Searching
5
Disappeared Transmitter no longer responds
4
Appeared
3
Mismatched Despite this, another transmitter has responded
2 ... 0 Reserved
Subject to reasonable modifications due to technical advances.
Pepperl+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
Operation in progress
OR logic operation on all detected hardware faults in the current
loops. Check the transmitter and its cabling, then execute
REBUILD.
Send device to Pepperl+Fuchs for repair
Send device to Pepperl+Fuchs for repair
Reserved
Reserved
Transmitter is searched for (due to having disap-
peared)
Transmitter responds again
Reserved
HART Multiplexer Master KFD2-HMM-16
Diagnosis and Fault Elimination
Start-up sequence running and must be completed
REBUILD function is running and must be completed
Switching off the power supply can result in loss of the
parameter assignment
SCAN function is running and must be completed
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)
Reserved.
Meaning/Remedial action
Meaning
Meaning
Corrective action
•
Check cabling
•
Check transmitter
Check cabling
Transmitter has been
exchanged for another type.
Check type, rebuild loop.
Copyright Pepperl+Fuchs, Printed in Germany
27
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