Rockwell-automation 1794-OF8IH FLEX Isolated Input/Output HART Analog Manual de usuario descargar pdf (Pagina 118)

Publication 1794-UM065B-EN-E - September 2010

106 Additional HART Protocol Information

Universal Commands

Command Data in Command Data in Reply

# Function Byte Data Type Byte Data Type

0 Read unique identifier — None — 0 254 (expansion) —

1 Manufacturer identification code

Manufacturer device type code

(1)

3 Number of preambles required

4 Universal command revision

5 Device-specific command revision

6 Software revision

7 Hardware revision

Device function flags

(2)

(H)

9…11 Device ID number (B)

1 Read primary variable — — — 0 PV units code —

1…4 Primary variable (F)

2 Read current and

percent of range

— None — 0…3 Current (mA) (F)

4…7 Primary variable

3 Read current and four

(predefined) dynamic

variables

— None — 0…3 Current (mA) —

4 PV units code

5…8 Primary variable

9 SV units code

10…13

Secondary variable

(3)

14 TV units code

15…18 Third variable

19 FV units code

20…23 Fourth variable

6 Write polling address 0 Polling address — — As in command —

1 2 ... 113 114 115 116 117 118 119 120 121 122 123 ... 163 164

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Rockwell-automation 1794-OF8IH FLEX Isolated Input/Output HART Analog Manual de usuario Pagina 118