FMC Corporation - Talstar 80 - Handbuch (Seite 54)

Commissioning Proline Promass 80 PROFIBUS PA
54
It is essential to adhere to the following sequence/assignment when configuring the modules in the
PROFIBUS master system:
!
Note!
• The assignment of the measured variables for the Analog Input function blocks 1 to 4 and the
Totalizer function block 1 can be changed by means of the CHANNEL function. A detailed
description of the individual modules is contained in the following section.
• The device has to be reset once a new configuration has been loaded to the automation system.
This can be effected as follows:
– By means of the local display
– By means of an operating program (e.g. FieldCare)
– By switching the supply voltage off and on again.
6.6.3 Description of the modules
AI module (Analog Input)
The corresponding measured variable, including the status, is cyclically transmitted to the
PROFIBUS master (Class 1) by means of the AI module (slots 1 to 4). The measured variable is
represented in the first four bytes in the form of floating point numbers in accordance with the
IEEE 754 standard. The fifth byte contains standardized status information corresponding to the
measured variable.
Further information on the device status
→ Page 71
Input data
Slot
sequence
Module Description
1 AI Analog Input function block 1
Output variable
→ mass flow (factory setting)
2 AI Analog Input function block 2
Output variable
→ volume flow (factory setting)
3 AI Analog Input function block 3
Output variable
→ corrected volume flow (factory setting)
4 AI Analog Input function block 4
Output variable
→ density (factory setting)
5
TOTAL or
SETTOT_TOTAL or
SETTOT_MODETOT_TOTAL
Totalizer function block 1
TOTAL
→ output variable = totalized mass flow (factory
setting)
SETTOT
→ totalizer control
MODETOT
→ totalizer configuration
6 DISPLAY_VALUE Default value for local display
7 CONTROL_BLOCK Control of device functions
Byte 1 Byte 2 Byte 3 Byte 4 Byte 5
Measured variable (IEEE 754 floating point
number) Status