Analog modules
9.3 SM 336; F-AI 6 x 0/4 ... 20 mA HART
Fail-safe signal modules
Installation and Operating Manual, 01/2010, A5E00085586-10
289
9.3.17.3 HART communication records
Transfer data records
HART communication can be controlled by one client per channel. Each channel has a
separate transfer area available. Each transfer area consists of the command and reply data
records.
Coordination rules for HART communication
● Fixed data record numbers are assigned to each client/channel:
Channel Client Data record
0 Command 80
0 Reply 81
1 Command 82
1 Reply 83
2 Command 84
2 Reply 85
3 Command 86
3 Reply 87
4 Command 88
4 Reply 89
5 Command 90
5 Reply 91
● After writing a command data record, a client has to read the reply data record before
writing another command data record.
● From master class 2 (e. g.
SIMATIC PDM
or the engineering system with PROFIBUS
master), the client can evaluate the "processing status" in the reply data record: If the
processing status is "successful" or "faulty", the data record contains current reply data or
error displays.
● The data record must always be read in its entirety, since after it is first read with a
successful or faulty status, the data record can be changed by the module.
● The status component in the reply data record (= HART status bytes) provides
information on whether and which errors have occurred.
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