Hart Job And Response Data Records - Siemens SIMATIC ET 200iSP Operating Instructions Manual

A.6.3

HART job and response data records

HART commands are handled on a channel-specific basis using a separate command interface
with one request data record and one response data record each.
Channel
0
1
2
3
Structure of the request data records 80, 82, 84, 86
Byte
0
1
2...239
"Request control" coding:
Bit 0...1:
Bit 2:
Bit 3...4:
Bit 5:
Bit 6:
Bit 7:
* HART commands are processed by the I/O module in both transparent message format and
compact message format. However, the response data from the I/O module is always made
available in transparent message format.
Note
When "Number of Preamble Bytes" = 255, the number of preambles set with the parameters is
used. The default setting is five. You can reconfigure the number of preamble bytes using the
HART-specific settings (see section HART-specific settings (Page 460)).
Structure of the response data records 81, 83, 85, 87
In case of response error
Byte
0
1
ET 200iSP
Operating Instructions, 11/2022, A5E00247483-AK
Data record number
Request to the field device
80
82
84
86
Meaning
Request control
Number of preamble bytes
Communication data according to HART specifica‐
tion
Reserved = 0
0 = Parameters are not checked
Reserved = 0
0 = Transparent format *
1 = Compact format
1 = Enable SHC mode
0 = HART request
Meaning
Response control
HART group error display
A.6 HART operating data records
Response from the field device
81
83
85
87
Comment
5...20, 255
Comment
Appendix
453