Siemens SIMATIC ET 200SP HA - Device-Specific HART Commands; SHC Sequence; Parallel Operation; Tags

7.3.3.3 Device-speci󹪝c HART commands
De󹪝nition
Device-speci󹪝c commands only apply to the respective 󹪝eld device.
7.3.4 SHC sequence
De󹪝nition
If a HART command with set SHC bit is sent to the I/O module, this channel is reserved for HART
commands for 2 seconds.
For each additional HART command with SHC bit set, the I/O module reserves this channel again
for HART commands for an additional 2 seconds. Command 3 or 9 for reading the HART variables
starts being sent cyclically to the 󹪝eld device again if a HART command without a set SHC bit is
detected for this channel, or if no further command is received for the channel within 2 seconds
of the previous HART command.
7.3.5 Parallel operation
De󹪝nition
The I/O module processes the HART communication in parallel operation, that is, all channels
simultaneously.
7.4 Tags
7.4.1 Useful information about HART variables
HART variables, the properties dialog and address assignment are explained below.
Properties dialog of the I/O module
In the properties dialog of the I/O module, you can con󹪝gure up to 4 HART variables directly in
the input address area of the I/O module. You select these from the four HART variables provided
by each channel:
HART variables (Page 46)
You can refer to the quality code for information on the process status of a HART variable.
Quality code (Page 47)
HART function
7.4 Tags
AI 4xI 2-/4-wire HART ISOL HA
Equipment Manual, 07/2022, A5E50101523-AB 45