Rockwell Automation Publication 1718-UM001A-EN-E - December 2019
39
Additional HART Protocol Information
Appendix C
3
Read current and
four (predefined)
dynamic variables
None
0…3
4
5…8
9
10…13
14
15…18
19
20…23
Current (mA)
PV units code
Primary variable
SV units code
Secondary variable
TV units code
Third variable
FV units code
Fourth variable
(3)
x
x
x
x
x
x
x
x
x
x
x
x
x
6
Write polling
address
0
Polling address
As in command
11
Read unique
identifier
associated with tag
0…5
Tag
(A)
0…11
12
Read message
None
0…23
Message (32 characters)
(A)
x
13
Read tag,
descriptor, date
0…5
6…17
18…20
Tag (8 characters)
Descriptor (16 characters)
Date
(A)
(A)
(D)
x
x
x
14
Read PV sensor
information
0…2
3
4…7
8…11
12…15
Sensor serial number
Units code for sensor limits and min span
Upper sensor limit
Lower sensor limit
Min span
(B)
(F)
(F)
(F)
15
Read output
information
0
1
2
3…6
7…10
11…14
15
16
Alarm select code
Transfer function code
PV/range units code
Upper range value
Lower range value
Damping value (seconds)
Write-protect code
Private-label distributor code
(F)
(F)
(F)
x
x
x
x
x
x
16
Read final
assembly number
None
0…2
Final assembly number
(B)
x
17
Write message
0…23
Message
(32 characters)
(A)
As in command
18
Write tag,
descriptor, date
0…5
6…17
18…20
Tag
(8 characters)
Descriptor
(16 characters)
Date
(A)
(A)
(D)
19
Write final
assembly number
0…2
Final assembly number
(B)
48
Read additional
device status
Starting in HART
version 7, the data in
the command could be
the same as in the
reply.
0…5
6…7
8
9
10
11
12
13
14…24
Device-specific status
Operational modes
Standardized status 0
Standardized status 1
Analog channel saturated
Standardized status 2
Standardized status 3
Analog channel fixed
(4)
Device-specific status
s
(5)
x
x
x
x
x
x
x
x
x
(1) (A) = Packed ASCII, (B) = 3-byte integer, (D) = Date, (F) = Floating Point (HART format), (H) = HART flag
(2) Bit 6 = multisensor device. Bit 1 = EEPROM control required. Bit 2 = protocol bridge device.
(3) Truncated after last supported variable.
(4) 24 bits each LSB…MSB refers to A0 #1…24.
(5) Sint []
Table 3 - HART Universal Commands
Command
Data in Command
Data in Reply
Contained in
No.
Function
Byte
Data
Type
(1)
Byte
Data
Type
(1)
Input
Tag
CIP
MSG