Fisher FIELDVUE DVC2000 Instruction Manual Supplement page 12

DVC2000 Digital Valve Controller
September 2017
Command 15: Read Primary Variable Output Information
This command returns the upper/lower range values for the primary variable which is defined to be the loop current
signal. These are the loop current values for the ends of physical travel, and are used to derive set point from the loop
current. It reports the range supplied in Command 35.
For example, the lower range, for an increase to open valve, will be the current which will produce a 0% set point.
However, for an increase to close valve, the lower range will be the loop current for a 100% set point.
The range values can be changed via Command 35.
The DVC2000 assumes 0% = 4mA and 100% = 20mA.
Byte
Request
None
Data bytes
0
1
Response
Data
2
Bytes
3-6
7-10
11­14
15
16
Code
Response
None
Codes
12
Format Description
PV Alarm Selection Code (see Common Table 6, Alarm
Selection Codes). The Alarm Selection Code indicates the
Enum
action taken by the device under error conditions. For
Actuators, the action taken by the positioner is indicated.
PV Transfer Function Code (see Common Table 3, Transfer
Function Codes). The Transfer Function Code must return
Enum
"0", Linear, if transfer functions are not supported by the
device.
AI Upper and Lower Range Values Units Code, as supplied
Enum
in command 35.
Float AI Upper Range Value
Float AI Lower Range Value
Float PV Damping Value (units of seconds)
Enum Write Protect Code (0=Disabled, 1=Enabled)
Enum Reserved. Must be set to "250", Not Used.
Class Description
Instruction Manual Supplement
Returned Value
250 (Not Used)
250 (Not Used)
From CMD 35
From CMD 35
From CMD 35
D103783X012
0.0
0 or 1
250