Siemens SIPART DR19 - Page 74

SIPART DR19
74 C73000-B7474-C140-06
Configuring Quick Reference
Parameters when S5=0/1/2/3/4/5 (U/I/thermocouples/Pt100)
1)
Only displayed when S5 = 2
2)
Only displayed when S5 = 5
Definition of parameters when S5=0/1/2/3/4/5 (U/I/thermocouples/Pt100)
Parameter/Function Param.-
names
Min Max Factory
settings
eng.
unit
Reference junction temp. tb1
1)
0 400.0 50 °C/°F/K
Line resistance (RL) Mr1
2)
0.00 99.99 10 Ω
Trim value RL Cr1
2)
Difference to Mr Ω
Decimal point MP1 _.--- ---- .- -
Start of measuring range MA1 -1999 9999 0.0 mV/°C/°F/K
End of measuring range ME1 -1999 9999 100.0 mV/°C/°F/K
Trimming in lower measuring range
Trimming in upper measuring range
CA1
CE1
present measured value
present measured value
mV/°C/°F/K
mV/°C/°F/K
Reset trim values PC1 no/no C/YES no C -
tb1 External reference junction temperature for thermocouples.
Mr1
Trimming of line resistance with Pt100 in two-wire circuit
Method 1: line resistance is known
Select Mr1 parameter and enter known line resistance: Cr1 parameter is ignored.
Cr1 Method 2: line resistance
unknown
• Short-circuit Pt100 at point of measurement;
• Select Cr1 parameter
• Press button (9) until 0.00 is displayed;
Line resistance is then trimmed automatically;
Mr1 shows line resistance measured.
MP1 MP1 defines the position of the decimal point for the measuring range.
MA1/
ME1
Definition of measuring range
with thermocouples or directly connected Pt 100s (S5=1/2/3/4/5)
• The values are entered directly in ºC/ºF/K (S7=0/1/2).
• If the selected temperature measuring range is to be displayed on the front panel, the
Offline parameters dA and dE must be equal to the CAE1 parameters MA1 and ME1.
in the case of: mV, U or input signals (S5=0)
• The values are entered in mV (-175 mV to +175 mV);
• The U or I input signals are converted to a measuring range of 0/20 to 100 mV in the
measuring range plug (6DR2 805-8J)
Example: 0 to 10 V or 0 bis 20 mA: MA1=0, ME1=100;
2 to 10 V or 4 bis 20 mA: MA1=20, ME1=100
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