Siemens S7-300 - Page 286

Analog modules
9.3 SM 336; F-AI 6 x 0/4 ... 20 mA HART
Fail-safe signal modules
286 Installation and Operating Manual, 01/2010, A5E00085586-10
For additional information about the F-I/O DB, refer to the S7 Distributed Safety,
Configuring and Programming
manual. For additional information about the F_CH_AI F-
channel driver, refer to the
S7 F/FH Systems, Configuring and Programming manual.
● "Off": HART communication is disabled.
Note
HART diagnostics is only available when HART is activated. This also applies to
PCS 7
maintenance stations.
However, the module diagnostics is always available.
"HART function" parameter
You use the "HART function" parameter to enable or disable HART communication with the
HART field device f
or the relevant channel of the module. The parameter is
not safety-
oriented
, i.e., it cannot be used for fail-safe shutdown of HART communication.
The "HART function" parameter can only be assigned if the "HART_Gate" parameter = "On"
or "Can be switched".
Activating HART according to the sensor used
The use of HART communication in safety-oriented applications is dependent on the HART-
capable sensors you are using. The following figure shows the HART communication
parameter assignment as a function of the sensor:
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+$57
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+$57ಯ21ರ
1R
+$57ಯ2IIರ
+$57ಯFDQEH
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+$57ರ2))ರ
<HV 1R
WARNING
As soon as a sensor does not comply with the required specifications, it can be used as a
guideline (configure HART "can be switched").
N
ote
In the case of dual-channel interconnection of sensors, observe the notes in the chapters in
which the application examples are described.