Siemens SINUMERIK 828D Manual page 33

Table 5- 15
Parameter
Input range (rated value)
Permitted overrange
Resolution
Accuracy
Internal resistance Ri
Table 5- 16
Parameter
Input range (rated value)
Standard
Resolution
Accuracy
Internal resistance Ri
CAUTION
If the Pt100 operating mode is selected, the hardware is protected against overvoltage.
In the event of an error:
1. an error bit is set which is then communicated to the PLC.
2. the module is brought to a standstill.
Notes regarding the connection and operation of Pt100 resistors:
The measurement is performed using a 4-wire connection system.
This enables the module to supply X3 with a constant current via the CO1, CI1, CO2 and CI2
terminals. The constant current is fed to the resistor to be measured where it is then
measured as the voltage drop. It is imperative to wire the connected constant current cables
directly to the resistor.
Measurements with 4-wire connections compensate for line resistances and return a
considerably higher degree of precision in comparison with 2-wire connections.
PP 72/48D 2/2A PN I/O module
Manual, 03/2010
Technical specifications in the "current input" operating mode
Technical specifications in the "Pt100" operating mode
5.6 Analog X3 inputs/outputs
Value
- 20 mA to + 20 mA
- 23.5 mA to + 23.5 mA
16 bits (including sign)
+/- 0.5 %
133 ohm
Value
- 200 ℃ to + 259 ℃
EN60751
16 bits (including sign)
+/- 2 ℃
>> 10 kOhm
Connection
33