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
287
9.3.17
Data record interface and user data
9.3.17.1
Overview of the data record interface and user data of the HART communication
Introduction
In this chapter you will find the specific data that you require for parameter assignment,
diagnostics and HART communication if you go beyond the standard applications of
STEP 7
or want to use your own configuration tool for HART communication.
The data made available cyclically (user data) is described at the end of the chapter.
Overview of the data record interface
The module uses data records as an input/output interface. They are used for the following
applications:
●
For writing parameters to the module
●
For reading the diagnostic data from the module
●
For transferring the HART communication data
●
For writing the additional parameters for HART
The mapping of the HART commands and HART replies to the PROFIBUS-DP data records
is based on the
PROFIBUS Profile HART Version 1.0. Further information on the HART
protocol can be found in the
PROFIBUS DP HART Profile Application Guideline.
The documentation indicated above is available from PI (PROFIBUS International) on the
Internet at http://www.profibus.com.
Table 9- 28 Additional parameters of the HART analog modules
Data record
number
Read/write
Size in bytes
Description
Read
21
Directory Process Data
148
DR information (directory data record): This data record contains the data record
numbers (index) of all HART data records and information on numbers and
revisions.
Read
3
HMD Feature Parameter Process Data
149
Optional HART functions (HART feature flags): This data record describes which
optional HART functions are supported and specifies the maximum data field length
of the request/reply data records.
Read/write
8
HMD Parameter Process Data
131 to 136
HART parameter data records: These data records contain the HART parameters for
the module by channel (0 - 5).
Write
259
HART Request Write Process Data
80, 82, 84, 86,
88, 90
HART request data records to field devices: These data records contain by channel
(0 - 7) the transfer data for the command from the client to the HART field device.
Read
259
HART Response Read Process Data
81, 83, 85, 87,
89, 91
HART reply data records from field devices: These data records contain the transfer
data for the reply from the HART field device to the client by channel (0 - 5).
