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5
Diagnosis and Fault Elimination
5.1
General
This section provides operating instructions to be used if faults occur and describes the possible causes of
such faults.
Faults and failures are signalled via the following means:
•
LEDs (see section 2.1.9 and 5.2)
•
Status/response code (see section 5.3)
•
Extended device status (see section 5.4)
5.2
LEDs
The following fault conditions can occur during the initialisation phase after start-up:
Red
Green
Off
Off
On
On
On
Off
On
On
5.3
Status/Response code (Response code)
5.3.1
General
Two status bytes, also referred to as the "Response code" are contained in every message from a field
device. These contain three types of information: Communication errors, command responses and the
device status. Depending on bit 7, the first two types are contained in the first status byte. The device status
is always transferred in the second byte.
5.3.2
Structure of the first byte
If bit 7 is set (1), the first status byte contains a summary of the communication errors. This information is
coded bit by bit.
If bit 7 is cleared (0), the first status byte contains a summary of the command responses. This information
is numbered consecutively and not coded bit by bit.
Communication error
This byte contains information concerning the reception of a message.
The individual bits indicate a detected error, which has resulted in non-acceptance of the message. Thus
neither can a response be given to the message. It is necessary to repeat the command, to check the con-
nections, to use the terminating resistors or to reduce the baud rate.
Subject to reasonable modifications due to technical advances.
24
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Cause
Off
•
No power supply available
•
LED(s) defect
On
Fault in device hardware
(CPU, ROM)
Off
Fault in device hardware
(CPU, ROM)
Off
•
Fault in device hardware
(CPU, RAM)
•
Device parameter assignment
incorrect (Parameter Loop
Switch Delay, Command 161)
HART Multiplexer Master KFD2-HMM-16
Diagnosis and Fault Elimination
Corrective action
•
Check power supply
•
Select DIP switch 1, isolate power
supply briefly; LEDs flash one after
the other
Send device to Pepperl+Fuchs for repair.
Send device to Pepperl+Fuchs for repair.
•
Send device to Pepperl+Fuchs for
repair.
•
Parameterise device again. If this is
not successful, the device must be
sent to Pepperl+Fuchs for repair.
Copyright Pepperl+Fuchs, Printed in Germany
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