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X20(c)CP1301, X20CP1381 and X20CP1382
16.3.2.5 Limit values
The input signal is monitored at the upper and lower limit values. By default the following limits are set for each
mode:
Limit value (default)
Upper maximum limit value
Lower minimum limit value
1)
The analog value is limited down to 0.
2)
Due to the default limit value, the analog value is limited to a minimum of 0 at currents <4 mA.
Limit value (default)
Upper maximum limit value
Lower minimum limit value
Other limit values can be defined if necessary. These are activated automatically by writing the limit value register
(see
"Lower limit value" on page 40
values will be monitored and limited according to the new limits. The results of monitoring are displayed in the
status register (see
"Status of the inputs" on page
Application example of setting limit values
A negative limit value must be configured in order to measure values <4 mA with a current signal of 4 to 20 mA:
0 mA corresponds to the value -8192 (0xE000).
16.3.2.5.1 Lower limit value
Name:
X1CfO_AI1_LowerLim
X1CfO_AI2_LowerLim
These registers can be used to configure the lower limit value for analog values. If the analog value goes below
the limit value, it is frozen at this value and the corresponding error status bit is set (see
on page
35).
Data type
Value
INT
-32768 to 32767
UINT
0 to 65535
Information:
When configured as 4 to 20 mA, this value can be set to -8192 (corresponds to 0 mA) in order to display
values <4 mA.
16.3.2.5.2 Upper limit value
Name:
X1CfO_AI1_UpperLim
X1CfO_AI2_UpperLim
These registers can be used to configure the upper limit value for analog values. If the analog value goes above
the limit value, it is frozen at this value and the corresponding error status bit is set (see
on page
35).
Data type
Value
INT
0 to 32767
UINT
0 to 65535
40
Voltage signal ±10 V
10 V
32767 (0x7FFF)
-10 V
-32767 (0x8001)
Table 9: Limit values for voltage and current signals
Temperature measurement
800.0°C
8000 (0x1F40)
-200.0°C
-2000 (0xF830)
Table 10: Limit values for temperature and resistance measurement
and
"Upper limit value" on page
Current signal 0 to 20 mA
20 mA
32767 (0x7FFF)
0 mA
0
1)
Resistance measurement
4000.0 Ω
0 Ω
35).
Current signal 4 to 20 mA
20 mA
32767 (0x7FFF)
4 mA
0
2)
32767 (0x7FFF)
0
40). From this point on, the analog
"Status of the inputs"
"Status of the inputs"
Data sheet V1.21
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