Siemens S7-300 - HART for Safety-Oriented Applications

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
283
Transparent message data - Format
The module supports the transparent message data format. Using SIMATIC PDM , you
therefore have direct access to the HART field device for the commands and replies.
Each module is equipped with a common HART modem for the 6 channels. In other words,
with
SIMATIC PDM you can only directly access one channel of the module at any one time
(multiplexes of the channels). It is not possible to simultaneously directly access another
channel of the same analog module.
See also
HART for safety-oriented applications (Page 283)
9.3.16.6 HART for safety-oriented applications
I
ntroduction
You assign the HART function in HW Config with the following parameters.
"HART_Gate" parameter
You use the "HART_Gate" parameter to enable the HART function (HART communication)
for the
module . The "HART_Gate" parameter acts as a module-wide fail-safe "main switch".
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