Fisher FIELDVUE DVC2000 Instruction Manual Supplement

Instruction Manual Supplement
D103783X012
DVC2000 Digital Valve Controller
September 2017
14
Command 35: Write Primary Variable Range Values
In the DVC2000, the Primary Variable is defined to be the Analog Input (loop current).
This command is used to write the ranging values reported in Command 15. It controls how the DVC2000 interprets
the loop current when creating the Travel Target. The upper range must be greater than the lower range.
This command does not do units conversion, but requires that the units code supplied match the PV units configured
in the device as set by Command 44.
If the range values are in percent, then they are assumed to be percent of 420 mA. For example, to range an increase
to open unit from 8 mA to 16 mA, but using percent range numbers, specify lower_range = 25% and upper_range =
75%.
This ranging is done in conjunction with the zero power condition. For an Increase to Open valve, the lower range is
the 0% setpoint level (valve plug in the valve seat), while the upper range is the 100% setpoint level. An Increase to
Close valve is exactly opposite.
This command will be accepted when the DVC2000’s Instrument Mode is In Service but will be rejected if Write
Protection is in effect.
Byte Format Description Allowable choices
Request
Data Bytes
0 UINT8 Upper and Lower Range Values Unit Code Unit Code 39 (mA) or 57(%)
1  4 Float Primary Variable Upper Range Value
5  8 Float Primary Variable Lower Range Value
Response
Data Bytes
0 UINT8 Upper and Lower Range Values Unit Code Unit Code 39 (mA) or 57(%)
1  4 Float Primary Variable Upper Range Value
5  8 Float Primary Variable Lower Range Value
Code Class Description
Command
Specific
Response
Codes
2 Invalid selection  Units code did not match configured units
7 In Write Protect Mode
16 Access Restricted  other master has access locked.
32 Busy
Command 38: Reset Configuration Change Flag
Resets the configuration changed flag in the DVC2000.
The DVC2000 contains two configuration changed bits, one for each master. Both bits are set when any write
operation occurs. This command clears the bit corresponding to the master sending this command, leaving the other
bit unmodified. Any write to the DVC2000 other than digital setpoint values and write protect status will cause the
configuration change flag to be set.
Byte Format Description
Request
Data Bytes
none
Response
Data Bytes
none
Code Class Description
Command
Specific
Response
Codes
none

Fisher FIELDVUE DVC2000 Specifications

General

Brand	Fisher
Model	FIELDVUE DVC2000
Category	Controller
Language	English