Endress+Hauser Proline Promag 55 - Page 102

Commissioning Proline Promag 55 PROFIBUS DP/PA
102 Endress+Hauser
DISPLAY_VALUE module
Using the DISPLAY_VALUE module (slot 6), the PROFIBUS Master (Class 1) can transmit a cyclical
value to the measuring device, which can be used either as a display value for the onsite display or
as a density value for calculating mass flow. The assignment of the transmitted value to the device
function is done using the CONTROL_BLOCK (slot 7).
Option 1  Display value
If the value transmitted to the device is to be displayed on the onsite display, the output byte of the
CONTROL_BLOCK (slot 7) must be changed from 0 -> 61. The assignment of the display value to
the main, additional or info line can be configured using the onsite display itself or using an
operating program (e.g. FieldCare).
Output data
Option 2  Density value for calculation of mass flow
If the density value transmitted to the device is to be used for the continuous calculation of mass
flow, the output byte of the CONTROL_BLOCK (slot 7) must be changed from 0 -> 60.
Output data
Status
The measuring device interprets the status in accordance with PROFIBUS Profile Specification
Version 3.0. The statuses OK, BAD and UNCERTAIN are indicated on the local display by a
corresponding symbol  ä 59.
CONTROL_BLOCK module
By means of the CONTROL_BLOCK module (slot 7), the measuring device is able to process
device-specific control variables from the PROFIBUS master (Class 1) in cyclic data transmission
(e.g. switching on positive zero return).
Supported control variables of the CONTROL_BLOCK module
The following device-specific control variables can be activated by changing the output byte from
0  x:
Byte 1 Byte 2 Byte 3 Byte 4 Byte 5
Display value (IEEE 754 floating point number) Status
Byte 1 Byte 2 Byte 3 Byte 4 Byte 5
Display value (IEEE 754 floating point number) Status