Siemens PPU 26x.3 series Manual page 217

Analog outputs
The module has two analog outputs. These can optionally be assigned parameters as voltage
or current output.
● "Voltage output" operating mode:
● "Current output" operating mode:
The cycle time of the analog value generation is limited by the PLC cycle.
The analog outputs are only enabled after the parameter assignment.
Note
From the switch-on of the I/O module to when it is enabled, the analog outputs do not have 0
V, but rather -0.2 V. This is due to a voltage pulse. This value must be taken into consideration
when specifying the setpoint.
Analog value display
The analog values are provided as 16-bit integer values. Depending on the operating mode,
the measured values must be converted using the following factors in order to achieve the
corresponding physical value.
Factor (AI):
Factor (AO):
Calculation: 16-bit value (hex. or dec.) * factor = measured value
Note
The analog values of the inputs and outputs are written and read in 16-bit data format, i.e. they
must be accessed word-by-word.
PPU and components
Manual, 10/2015, 6FC5397-2DP40-5BA3
Parameter
Output range (rated value)
Permitted overrange
Resolution
Accuracy
Max. load current
Parameter
Output range (rated value)
Permitted overrange
Resolution
Accuracy
Load impedance
Voltage [V]
0.00151947
0.000381469
Connectable components
7.8 PP 72/48D PN and PP 72/48D 2/2A PN
Value
- 10 V to + 10 V
- 10.5 V to + 10.5 V
16-bit (incl. sign)
+/-0.5%
-3 mA to +3 mA
Value
-20 mA to +20 mA
-20.2 mA to +20.2 mA
16-bit (incl. sign)
+/-0.5%
≤ 600 ohm
Current [mA] Temperature [° C]
0.003051758 0.1
0.0007629 -
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