Emerson Fisher FIELDVUE DVC5000, Instruction Manual Supplement

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Instruction Manual Supplement
D103266X012
DVC5000 Digital Valve Controller
May 2018
13
Common­Practice Commands
The DVC5000 field device supports the following common practice commands:
Supported Commands
Command 33: Read Device Variables
Command 35: Write Primary Variable Range Values
Command 38: Reset Configuration Change Flag
Command 42: Master Reset
Command 48: Read Additional Status
Command 50: Read Dynamic Variable Assignments*
Command 54: Read Device Variable Information
Command 108: Write Burst Mode Command Number*
Command 109: Burst Control Mode*
*Command 50, 108, and 109 are supported in Device Revision 3 only
Command 33: Read Device Variables
This command is used to read the value of up to four selected Device Variables.
The Device Variables and the Variable Units Code are listed on page 6.
Note: If any one of the requested variable IDs is invalid, the INVALID_SELECTION error will be returned along with no
data bytes.
Byte Format Description Allowable choices
Request
Data Bytes
0 Variable ID Variable assigned to slot #0 See Device Variables on page 6
1 Variable ID Variable assigned to slot #1 See Device Variables on page 6
2 Variable ID Variable assigned to slot #2 See Device Variables on page 6
3 Variable ID Variable assigned to slot #3 See Device Variables on page 6
Response
Data Bytes
0 Variable ID Variable assigned to slot #0
1 Byte, hex Slot #0 Variable units code
2­5 Float Slot #0 Variable value
6 Variable ID Variable assigned to slot #1
7 Byte, hex Slot #1 Variable units code
8­11 Float Slot #1 Variable value
12 Variable ID Variable assigned to slot #2
13 Byte, hex Slot #2 Variable units code
14­17 Float Slot #2 Variable value
18 Variable ID Variable assigned to slot #3
19 Byte, hex Slot #3 Variable units code
20­23 Float Slot #3 Variable value
Code Class Description
Command­
Specific
Response
Codes
2 Invalid selection – Invalid Variable ID (see note above)