Endress+Hauser Proline Prowirl 72, Руководство по эксплуатации

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5 Operation Proline Prowirl 72
32 E Hauser
5.4.2 Device variables and process variables
Device variables:
The following device variables are available via the HART protocol:
Process variables:
At the factory, the process variables are assigned to the following device variables:
• Primary process variable (PV)
→
flow
• Secondary process variable (SV)
→
totalizer
• Third process variable (TV)
→
not assigned
• Fourth process variable (FV)
→
not assigned
5.4.3 Universal / common practice HART commands
The following table contains all the universal and common practice commands supported by the
measuring device.
ID (decimal) Device variable
0 OFF (not assigned)
1 Flow
250 Totalizer
Command no.
HART command / access type Command data
(numeric data in decimal form)
Response data
(numeric data in decimal form)
Universal commands
0 Read the unique device
identifier
Access type = Read
None The device identifier provides information on the device and
manufacturer; it cannot be altered.
The response consists of a 12-byte device ID:
– Byte 0: fixed value 254
– Byte 1: manufacturer ID, 17 = E+H
– Byte 2: device type ID, 56 = Prowirl 72
– Byte 3: number of preambles
– Byte 4: rev. no. universal commands
– Byte 5: rev. no. device-spec. Commands
– Byte 6: software revision
– Byte 7: hardware revision
– Byte 8: additional device information
– Byte 9-11: device identification
1 Read the primary process
variable
Access type = Read
None – Byte 0: HART unit ID of the primary process variable
– Byte 1-4: primary process variable
Primary process variable = flow
!
Note!
Manufacturer-specific units are represented using the HART unit
ID “240”.
2 Read the primary process
variable as current in mA and
percentage of the set
measuring range
Access type = Read
None – Byte 0-3: current current of the primary process variable in mA
– Byte 4-7: percentage of the set measuring range
Primary process variable = flow