Allen-Bradley 1794-IE8H, Руководство пользователя, Страница: 94 / 146

Publication 1794-UM063A-EN-P - March 2006
B-2 FLEX I/O HART Module Commands
Universal Commands
Table B.1 Universal HART Module Commands
Command Action Meaning
0 Read Read unique device
identification Twelve-byte device identifiers are
given in the response
1 Read HART variables (process
values) Commands are only supported for
compatibility purposes and are
without any meaning
The transmitters, i.e., the SCAN
function, have the following
functions.
•
Read primary variable
•
Read primary variable as
current (in mA) and percent
range)
•
Primary variable is read as
a current (in mA) and four
predefined dynamic
variables
2 — —
3 — —
11 Read unique identifier
associated with tag The response is a twelve-byte
device identifier if the given tag
matches the tag of the multiplexer
12 Read message Read the 32-bit message (also see
bit 17)
13 Selection switch markings in
hand, read description and date Read the eight-digit selection
switch marking (tag) and the
16-digit time and date
17 Write Write message The 32-digit message is written
(also see bit 12)
18 Write tag, description, and date Save an 8-digit (tag), a 16-digit
description and date