Instruction Manual Supplement
D103783X012
DVC2000 Digital Valve Controller
September 2017
12
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 Format Description Returned Value
Request
Data bytes
None
Response
Data
Bytes
0 Enum
PV Alarm Selection Code (see Common Table 6, Alarm
Selection Codes). The Alarm Selection Code indicates the
action taken by the device under error conditions. For
Actuators, the action taken by the positioner is indicated.
250 (Not Used)
1 Enum
PV Transfer Function Code (see Common Table 3, Transfer
Function Codes). The Transfer Function Code must return
“0”, Linear, if transfer functions are not supported by the
device.
250 (Not Used)
2 Enum
AI Upper and Lower Range Values Units Code, as supplied
in command 35.
From CMD 35
3-6 Float AI Upper Range Value From CMD 35
7-10 Float AI Lower Range Value From CMD 35
1114 Float PV Damping Value (units of seconds) 0.0
15 Enum Write Protect Code (0=Disabled, 1=Enabled) 0 or 1
16 Enum Reserved. Must be set to “250”, Not Used. 250
Code Class Description
Response
Codes
None
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