Endress+Hauser Proline Prosonic Flow 90 Operating Instructions Manual page 56

5 Operation
Command No.
HART command / Access type
50 Read assignment of the device
variables to the four process
variables
Access = read
51 Write assignments of the device
variables to the four process
variables
Access = write
53 Write device variable unit
Access = write
59 Set number of preambles in
message responses
Access = write
56
Command data
(numeric data in decimal form)
none
Setting of the device variables to the four process
variables:
– Byte 0: Device variable code for the primary process
variable
– Byte 1: Device variable code for the second process
variable
– Byte 2: Device variable code for the third process
variable
– Byte 3: Device variable code for the fourth process
variable
Code of the support device variables:
See data on Page 51
Factory setting:
• Primary proc. variable = Volume flow
• Secondary process variable = Totalizer
• Third process variable = Sound velocity
• Fourth process variable = Flow velocity
This command set the unit of the given device
variables. Only those units which suit the device
variable are transferred:
– Byte 0: Device variable code
– Byte 1: HART unit code
Code of the supported device variables:
See data on Page 51
!
Note!
• If the written unit is not the correct one for the
device variable, the device will continue with the
last valid unit.
• If you change the unit of the device variable, this
has no impact on the system units.
This parameter sets the number of preambles which
are inserts in the message responses:
Byte 0: Number of preambles (2...20)
Proline Prosonic Flow 90
Response data
(numeric data in decimal form)
Display of the current variable assignment of the
process variables:
– Byte 0: Device variable code for the primary process
variable
– Byte 1: Device variable code for the second process
variable
– Byte 2: Device variable code for the third
process variable
– Byte 3: Device variable code for the fourth
process variable
Factory setting:
• Primary process variable: code 30 for volume flow
• Secondary process variable: code 250 for totalizer
• Third process variable: code 40 for sound velocity
• Fourth process variable: code 49 for flow velocity
!
Note!
You can set or change the assignment of device
variables to process variables using Command 51.
The variable assignment of the process variables is
displayed as a response:
– Byte 0: Device variable code for the primary process
variable
– Byte 1: Device variable code for the second process
variable
– Byte 2: Device variable code for the third process
variable
– Byte 3: Device variable code for the fourth process
variable
The current unit of the device variables is displayed in
the device as a response:
– Byte 0: Device variable code
– Byte 1: HART unit code
!
Note!
Manufacturer-specific units are represented using the
HART unit code "240".
As a response, the current number of the preambles is
displayed in the response message:
Byte 0: Number of preambles
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