Analog modules
9.3 SM 336; F-AI 6 x 0/4 ... 20 mA HART
Fail-safe signal modules
292
Installation and Operating Manual, 01/2010, A5E00085586-10
Evaluation of the reply data
If you have a current reply data record in front of you, you can carry out the following checks:
●
By specifying "Last command", you ensure that the reply belongs to the command sent.
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You can identify errors by analyzing the group fault displays (see the table below).
●
Further error messages are specified in the second table below (HART protocol errors in
reply byte 2) and the two HART status bytes.
●
In the group fault bytes in the error status the events are set to bits "1".
Table 9- 29 HART group fault displays in reply byte 1 (extended response control)
Bit no.
HART group fault display
Meaning
0
Further status information available
Corresponds to bit 4 in the channel-specific
error bytes in diagnostic data record 1 (2nd
HART status byte). The HART command 48
provides you with further status information, if
required.
1
HART communication error --> HART
communication error entry in
diagnostic data record 1
Here the field device has identified a
communication error on receiving the
command. The error information is contained in
the 1st HART status byte (in the reply data
record or diagnostic data record 1) . This is
accepted without being changed.
2
HART group fault display -->
Parameter check
0: HMD parameters unchanged
1: Check HMD parameters
3
Always 0
Reserved
4 - 7
HART protocol error for reply -->
HART communication error entry in
diagnostic data record 1
Error during HART communication from the field
device to the module (i.e. there was an error in
receiving the reply).
0: Unspecified error
1: HMD error
2: Channel fault
3: Command error
4: Query error
5: Reply error
6: Query rejected
7: Profile query rejected
8: Vendor-specific query rejected
9 - 11: Not used
12 - 15: Vendor-specific status
You will find information on the cause of the
problem in reply byte 2. See the table below.
