Endress+Hauser Promag 53 - Rescaling the Input Value

Promag 53 PROFIBUS-DP/-PA 6 Commissioning
Endress+Hauser 89
6.3.1 Rescaling the input value
In the Analog Input function block the input value or input range can be scaled in
accordance with the automation requirements.
Example:
• The system unit in the Transducer Block is m
3
/h.
• The measurement range of the sensor is 0 ... 30 m
3
/h.
• The output range to the automation control system should be 0 ... 100%.
• The measured value from the Transducer Block (input value) is rescaled linearly via
the input scaling PV_SCALE to the desired output range OUT_SCALE.
Parameter group PV_SCALE (see “Description of Device Functions” manual)
Parameter group OUT_SCALE (see “Description of Device Functions“ manual)
The result is that with an input value of, for example 15m
3
/h, a value of 50% is output via
the parameter OUT.
Fig. 51: Rescaling the input value in the AI function block

Note:
The OUT_UNIT does not have any effect on the scaling. It should, however, be config-
ured that it can, for example, be shown on the display.
PV_SCALE_MIN (V1H0)
→ 0
PV_SCALE_MAX (V1H1)
→ 30
OUT_SCALE_MIN (V1H3)
→ 0
OUT_SCALE_MAX (V1H4)
→ 100
OUT_UNIT (V1H5)
→ [%]
F06-53PBxxxxx-05-xx-xx-en-002
Esc
E
- +
0...30 m /h
3
Esc
E
- +
15 m /h
3
m /h
3
PV_SCALE
OUT_SCALE
100
0
0
30
100%
0
0
100%
OUT
50%
Volume
flow
Analog Input Function blockTransducer
block