Configuration and operation
4.15 STEP 7 configuration of individual parameters
CP 1243-7 LTE
84 Operating Instructions, 01/2015, C79000-G8976-C381-01
Configuration of the limit value
The value to be configured as a whole decimal number therefore depends on the value
range of the PLC tags and the raw value of the analog module:
Raw value of the of PLC tags *
Overrange 32511
...
2130769779
...
7EFF
...
23.515
...
23.515
...
22.810
...
117.593
...
Nominal range
(unipolar / life zero)
27648
...
1811994624
...
6C00
...
20
...
20
...
100
...
Nominal range (bipo-
lar)
27648
...
0
...
1811994624
...
0
...
6C00
...
0000
....
20
...
0
...
100
...
0
...
Underrange
(unipolar / life zero)
-1
...
-1
...
FFFF
...
-0.001
...
3.999
...
-0.004
...
Underrange (bipolar) -27649
...
-1812067105
...
93FF
...
-20.001
...
-100.004
...
Undershoot / wire
-32768 −2147483648 8000 < -3.518 < 1.185 < -17.593
* The raw values of the measured values relate to the values of 16-bit or 32-bit PLC tags.
Note
Evaluation of the value even when the option is disabled
If you enable one or both options and configure a value and then disable the option later, the
grayed out value is nevertheless evaluated.
To disable the two options, delete the previously configured values limit values from the input
boxes and then disable the relevant option.
Recommendation for quickly fluctuating analog values:
If the analog value fluctuates quickly, it may be useful to smooth the analog value first if limit
values are configured. If the analog value fluctuates close to a limit value for a longer period
of time, with a smoothed value you avoid a status change each time the value exceeds/falls
below the limit value and so triggers a transfer.
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