reserved
Diag.ext_overflow
Communication interface PROFIBUS DP
Deutschmann Automation GmbH & Co. KG
46
Fieldbus-Gateway UNIGATE
®
CX C4Map - PROFIBUS V. 1.0
28.9.20
Octet 3
0
Diag master_add: Master address after
programming (FF without programming)
Octet 4
0
Ident. number high byte
Octet 5
0
Ident. number low byte
Octet 6
0
External diagnosis: header, length entry
Octet 7
0
UNIGATE error number
Octet 8
0
14.5.3.1 Diagnosis in DPV1
The "external diagnosis" of DPV0 (old PB) is used differently at DPV1. At DPV1 the alarms and
the status messages are transfered there. Since the gateway’s error numbers have been trans-
fered in the external diagnosis it became necessary then to carry out an adaptation at DPV1.
Now the 3 bytes "0x81, 0x00, 0x00" have been inserted in front of the actual error message in
order to be compatible with DPV1-masters. With it a DPV1-master identifies our gateway’s error
as status message now.
This results in a different representation of our gateway error in PROFIBUS. At DPV0 the error
number is transmitted in unmodified form as 1 byte external diagnosis. In case DPV1 has been
activated in the gateway through the GSD-file, the error number occurs as 1 byte status mes-
sage.
Supposing the DPV1 is activated and a master (which does not support the alarms and status
messages) is connected, then our gateway error number is presented as "external diagnosis"
with 4 bytes (see above), at which point the 4th byte contains the error number and the preceding
3 bytes (0x81, 0x00, 0x00) can be ignored.
Summary of Contents for UNIGATE CX C4Map
Page 2: ...Handbuch Art Nr V4412E ...
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