II - DCE FEL ČVUT v Praze

SIMATIC S7 Ex Analog Modules
Measuring ranges
for resistance
measurement
3-58
Table 3-33 contains all measuring ranges for resistance measurements
Table 3-33 Measuring ranges for resistance measurements
Selected measurement
mode
Resistance
4-wire connection
Connectable
thermocouples
Explanation Measuring range
The digitized analog values are specified in Section 3.1.2 in
Table 3-5 Resistance measuring ranges.
150 ohms
300 ohms
600 ohms
Table 3-34 shows all connectable thermocouples and thermal resistors. The
linearization of characteristic curves is specified for thermocouples in
accordance with DIN IEC 584.
For thermal resistor measurements, linearization of the characteristic curves
is based on DIN 43760 and IEC 751.
Table 3-34 Connectable thermocouples and thermal resistors
Measurement mode Explanation Measuring range
– Linearization and compensation to 0oC Digitized analog values for the specified Type T [Cu-CuNi]
thermocouples are listed in Section 3.1.2 , Type U [Cu-CuNi]
– Linerazation and compensation to 50o p ,
C
Tables 3-10 to 3-12.
(one unit corresponds to 0.1o yp [ ]
– Linearization and compensation
internal comparison
C)
Type E [NiCr-CuNi]
Type J [Fe-CuNi]
Type L [Fe-CuNi]
1)
Type L [Fe-CuNi]
Type K [NiCr-Ni]
Type N [NiCr-SiNiSi]
Type R [Pt13Rh-Pt]
– Linearization and compensation
external comparison2) Type R [Pt13Rh Pt]
Type S [Pt10Rh-Pt]
Type B
[Pt30Rh-Pt6Rh]
Thermal resistance +
linearization 4-wire connection (temperature
measurement)
The digitized analog values for the
specified thermal resistors are listed in
Section 3.1.2, Tables 3-6 to 3-9.
Pt 100, Pt 200, Ni 100
Standard range
Pt 100 , Pt 200, Ni 100
Climatic range
1) – In the case of internal compensation in the module, all 8 channels are available for temperature measurements
also with different types of thermocouples.
– The terminal temperature of the module is provided at a short-circuited input.
This does not apply to thermocouple Type B which is not suitable for measurements in the ambient
temperature range.
2) Following types of compensation are possible with this measurement method:
– Use of compensation box
The compensation box must correspond to the connected type of thermocouple.
Connection to channel 7.
– Use of thermal resistors in climatic range (e.g. Pt 100) for compensation.
The absolute terminal temperature is determined in the climatic range with a thermal resistor (e.g. Pt 100) for
compensation purposes. In this case, the thermocouples to be compensated can be of different types.
Connection to channels 6 and 7
I/O Modules with Intrinsically-Safe Signals
C79000-G7076-C152-04