II - DCE FEL ČVUT v Praze

Table 4-13 HART group error displays
Bit No. Group error display in Byte 1 Meaning
0 Always 0 Not used
1 Command rejected Used in the following cases:
For a module command which does not exist.
If you try to activate the burst mode when it is already activated.
If you try to deactivate the burst mode when it was activated by
another client.
If you try to change the polling address of the HART field
device.
2 Further status information available. Corresponds to bit 4 in the 2nd HART status byte. You can
obtain further status information with HART command 48.
3 HART device status
––> “Modification of parameters”
entry in diagnostic data, data record 1
I/O Modules with Intrinsically-Safe Signals
C79000-G7076-C152-04
The field device transmits its device state. This information is
found in the 2nd HART status byte which is accepted
unchanged.
4 HART command status The field device transmits displays on the receipt of the
command. Information on this can be found in the 1st HART
status byte.
5 Error during HART communication
––> “HART group error” entry in
diagnostic data, data record 1
6 HART protocol error during
response
––> “HART group error” entry in
diagnostic data, data record 1
7 Wire break
––> Parallel entry “Wire break” in
diagnostic data, data record 1
Table 4-14 HART protocol error during response from field device to module
The field device has detected a communication error while
receiving the command. Information on the error can be found in
the 1st HART status byte which is accepted unchanged.
Error during HART communication between field device and
module, i.e. the response was incorrectly received. Information
on the cause of the error can be found in the next byte.
See Table 4-14.
The connection to the measuring transducer or the signal control
element has been broken.
Bit No. HART protocol error in byte 2 Meaning
0 Bad frame timing Waiting time elapsed without response being received from
field device.
1 Always 0 Not used
SIMATIC S7 HART Analog Modules
2 Bad character transmission timing The pause between two bytes was not observed.
3 Checksum error in response The checksum calculated does not match the checksum
transmitted.
4 Response frame error Error receiving HART signal (in UART)
5 Response overrun error Error receiving HART signal (in UART)
6 Response parity error Error receiving HART signal (in UART)
7 HART access not possible The connection to the field device is constantly busy. This
error is registered if the transmission time exceeds 10
seconds.
4-33