Integration Of The Hart Field Devices - Siemens S7-300 Installation And Operating Manual

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
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.
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.
Figure 9-44
See also
HART communication records (Page 289)
Fail-safe signal modules
Installation and Operating Manual, 01/2010, A5E00085586-10
SIMATIC PDM
to communicate with the HART field device.
Command
0
Location of use of the HART analog modules in the distributed system
9.3 SM 336; F-AI 6 x 0/4 ... 20 mA HART
SIMATIC PDM
Function
Reads the manufacturer and device type
Analog modules
281