Siemens PPU 26x.3 series Manual page 215

Analog inputs
The module has two analog inputs. These can optionally be assigned parameters as voltage,
current or Pt100 input.
● "Voltage input" operating mode:
● "Current input" operating mode:
● "Pt100" mode
Cycle time of the analog value generation: 20 ms per channel
The analog inputs are only enabled after the parameter assignment.
NOTICE
Protection from overvoltage
If the Pt100 operating mode is selected, the hardware is protected against overvoltage. The
following mechanisms are triggered in the event of an error:
1. An error bit is set which is then communicated to the PLC.
2. The module is shut down.
Measurement using a 4-wire connection system
Notes regarding the connection and operation of Pt100 resistors:
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
PPU and components
Manual, 10/2015, 6FC5397-2DP40-5BA3
Parameter
Input range (rated value)
Permitted overrange
Resolution
Accuracy
Internal resistance Ri
Parameter
Input range (rated value)
Permitted overrange
Resolution
Accuracy
Internal resistance Ri
Parameter
Input range (rated value)
Standard
Resolution
Accuracy
Internal resistance Ri
Connectable components
7.8 PP 72/48D PN and PP 72/48D 2/2A PN
Value
- 10 V to + 10 V
- 11.75 V to + 11.75 V
16-bit (incl. sign)
+/-0.5%
100 KOhm
Value
- 20 mA to + 20 mA
- 23.5 mA to + 23.5 mA
16-bit (incl. sign)
+/-0.5%
133 ohm
Value
- 200° C to + 259° C
EN60751
16-bit (incl. sign)
+/- 2° C
>> 10 kOhm
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