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3.4.4
Operation of the electronics
L+
Power supply +
L-
Power supply -
DO
Digital output
Sens
Sensor
In
Universal input
Figure 3-7
Block diagram
The 24 V DC power supply uses a polarity reversal protection diode to supply the internal
supply voltage of 5 V for circuit 1 and 3.3 V and 8.2 V for circuit 2. Circuits 1 and 2 are
isolated from the power supply and from one another. Circuit 1 consists of a microcontroller
(µC2), which is responsible for PROFIBUS communication. It is connected to the
microcontroller (µC1) in circuit 2 by a serial, isolated coupling. At the heart of this circuit is a
signal processor with integrated analog-to-digital converter for high-speed recording and
evaluation of the available signals. Furthermore, an EEPROM for storage of data even in the
case of power failure and the display are actuated and the buttons are read in.
SITRANS DA400 for oscillating positive displacement pumps
Operating Instructions, 09/2008, A5E00841120-03
I+
Analog current input +
⊥
Mass
DI
Digital input
A
PROFIBUS DP Signal A (green)
B
PROFIBUS DP Signal B (red)
Description
3.4 Mode of operation
21
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