Siemens CP 1243-7 LTE-EU, Руководство по эксплуатации, Страница: 84 / 132

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:
Division Raw value of the of PLC tags * Module output [mA] Measuring
range [%]
Decimal Hexadeci-
mal
0 - 20
(unipolar)
-20 - +20
(bipolar)
4 - 20
(life zero)
16 bits 32 bits 16 bits
Overflow 32767 2147483647 7FFF > 23.515 > 23.515 > 22.810 > 117.593
Overrange 32511
...
27649
2130769779
...
1812067105
7EFF
...
6C01
23.515
...
20.001
23.515
...
20.001
22.810
...
20.001
117.593
...
100.004
Nominal range
(unipolar / life zero)
27648
...
0
1811994624
...
0
6C00
...
0000
20
...
0
20
...
4
100
...
0
Nominal range (bipo-
lar)
27648
...
0
...
-27648
1811994624
...
0
...
-1811994625
6C00
...
0000
....
9400
20
...
0
...
-20
100
...
0
...
-100
Underrange
(unipolar / life zero)
-1
...
-4864
-1
...
-318729855
FFFF
...
ED00
-0.001
...
-3.518
3.999
...
1.185
-0.004
...
-17.59
Underrange (bipolar) -27649
...
-32512
-1812067105
...
-2130769779
93FF
...
8100
-20.001
...
-23.516
-100.004
...
-117.593
Undershoot / wire
break
-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.