FMC Corporation - Talstar 80 - Handbuch (Seite 56)

Commissioning Proline Promass 80 PROFIBUS PA
56
TOTAL module
The measuring device has one totalizer function block. The totalizer values can be cyclically
transmitted to the PROFIBUS master (Class 1) via the TOTAL module (slot 5). The totalizer value
is represented in the first four bytes in the form of a floating point number in accordance with the
IEEE 754 standard. The fifth byte contains standardized status information corresponding to the
totalizer value.
Further information on the device status
→ Page 71
Input data
Assignment of the measured variables to the TOTAL module
The TOTAL module can transmit different totalizer variables to the PROFIBUS master (Class 1).
The measured variables are assigned to the Totalizer function block by means of the local display or
with the aid of an operating program (e.g. FieldCare) in the "CHANNEL" function:
TOTALIZER
→ TOTALIZER option: select a totalizer →
CHANNEL: select a measured variable
Possible settings
Factory setting
Example:
You want to cyclically transmit the totalized volume flow as totalizer value 1 to the PROFIBUS
master (Class 1) by means of the TOTAL module (slot 5):
TOTALIZER
→ TOTALIZER option: select TOTALIZER 1, then select CHANNEL = VOLUME
FLOW
Byte 1 Byte 2 Byte 3 Byte 4 Byte 5
Totalizer value (IEEE 754 floating point number) Status
Totalizer value/measured variable ID for CHANNEL function
MASS FLOW 277
VOLUME FLOW 273
CORRECTED VOLUME FLOW 398
OFF 0
Module Totalizer
function block
Totalizer value/
Measured variable
Unit ID for CHANNEL
function
TOTAL (slot 5) 1 MASS FLOW kg/s 277