Siemens S5-135U/155U - Manual (Page 446)

9-64
System Manual
C79000-G8576-C199-06
9.5.9 Connecting Resistance Thermometers to the 465 Analog Input
Module
The relevant resistance thermometer is fed with a current of 2.5 mA (I
C+
/I
C-
)
by a constant current generator via a 6ES5 498-1AA11 card. The voltage at
the Pt 100 is picked off at measurement inputs M+ and M-.
If only inputs 0 to 3 are assigned to resistance thermometers, you can connect
other current and voltage sensors to inputs 4 to 7 by means of a coding key. If
you use the Pt 100 for measurement, you cannot utilize channels 12 to 15.
Channels 8 to 11 supply the resistance thermometers which are connected at
inputs 0 to 3.
Note that the mode of the module is set to the 500 mV voltage range.
Analog Input/Output Modules