Connecting Resistance Thermometers In The Extended Pt 100 Range - Siemens S5-135U/155U System Manual

9.3.11 Connecting Resistance Thermometers in the Extended Pt 100
Range
The series-connected resistance thermometers (up to 8 Pt 100s) are fed with a
current of 2.5 mA (I
Pt 100s is picked off at measurement inputs M+ and M-.
In this mode, the temperature range of approximately -100 C to +100 C has
a more accurate resolution. The mode is printed on the cover of the module
as follows: "resistance thermometer compensated low range."You should
only use the 6ES5 498-1AA11 range card (
Unused inputs must be connected in parallel to a wired input. In the
following figure, for example, these are the inputs CH4 to CH7.
Figure 9-10
System Manual
C79000-G8576-C199-06
/I ) by a constant current generator. The voltage at the
C+ C-
M+
Ch0
M–
M+
Ch1
M–
M+
Ch2
M–
M+
Ch3
M–
M+
Ch4
M–
M+
Ch5
M–
M+
Ch6
M–
M+
Ch7
M–
Ic–
Ic+
24V
L+
M24V
L–

Connecting Resistance Thermometers in the Extended Pt 100 Range

Analog Input/Output Modules
50 mV / 500 mV).
6ES5498-
1AA11
6ES5498-
1AA11
2.5mA
9-21