Endress+Hauser Promag 53 - Page 95

Promag 53 PROFIBUS-DP/-PA 6 Commissioning
Endress+Hauser 95
Input data
The following are examples of input data: volume flow, totalizers 1-3 and calculated
mass flow.
The current volume flow, totalizers 1-3 and calculated mass flow can be displayed on
the basis of these measured variables. The calculated mass flow is derived from the vol-
ume flow and a fixed density.
Data transfer from Promag to the automation control system
The input and output bytes are structured in a fixed sequence. If addressing is effected
automatically using the configuration program, the numerical values of the input and
output bytes may deviate from the values in the following table.
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Note:
• The system units in the table correspond to the predefined scales which are trans-
ferred during the cyclic data exchange.
• The assignment of the measured variables to the respective variables can be effected
using the parameter Channel, the local controls or a Class 2 master.
• Totalizers 1-3 can be configured individually. The following settings are possible
(factory setting: volume flow in m
3
):
– Off
– Mass flow
– Volume flow
The parameter “Channel” is described in more detail in the separate “Description of
Device Functions” manual.
Input
byte
Process
parameter
Access
type
Comment/Data format Factory setting
unit
0, 1, 2, 3 Volume flow read
32-bit floating point number
(IEEE-754)
Illustration
→ Page 93
m
3
/h
4
Status
volume flow
read Status codes
→ Page 103 –
5, 6, 7, 8 Totalizer 1 read
32-bit floating point number
(IEEE-754)
Illustration
→ Page 93
* m
3
or kg
9
Status
totalizer 1
read Status codes
→ Page 103 –
10, 11, 12, 13 Totalizer 2 read
32-bit floating point number
(IEEE-754)
Illustration
→ Page 93
* m
3
or kg
14
Status
totalizer 2
read Status codes
→ Page 103 –
15, 16, 17, 18 Totalizer 3 read
32-bit floating point number
(IEEE-754)
Illustration
→ Page 93
* m
3
or kg
19
Status
totalizer 3
read Status codes
→ Page 103 –
20, 21, 22, 23 Mass flow read
32-bit floating point number
(IEEE-754)
Illustration
→ Page 93
kg/h
24 Status mass flow read Status codes
→ Page 103