Siemens S7-300 - Integration of the HART Field Devices

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
281
9.3.16.4 Integration of the HART field devices
Use of
The SM 336; F-AI 6 x 0/4 ... 20 mA HART can be used decentrally in an ET 200M for use of
the HART function.
You can connect one field device to each of the 6 channels of the SM 336; F-AI 6 x 0/4 ... 20
mA HART. The analog module operates as the HART master, the field devices as HART
slaves.
You can use
SIMATIC PDM to communicate with the HART field device. SIMATIC PDM
transmits and receives data via the HART analog module, comparable to a client for which
the HART analog module acts as a server.
You also have the option to use the read/write data record mechanisms.
Command Function
0 Reads the manufacturer and device type
Because the SM 336; F-AI 6 x 0/4 ... 20 mA HART supports only the "longframe command",
the unique hardware address of the field device must be known.
Check byte 0 in the replay data record. As long as byte 0 = 0x03, the reply has not yet been
completely received. With byte 0 = 0x04, there is a positive reply that you can evaluate.
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Figure 9-44 Location of use of the HART analog modules in the distributed system
See also
HART communication records (Page 289)