How Th320 Works - Siemens SITRANS TH320 Operating Instructions Manual
Temperature transmitter
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Also See for SITRANS TH320:
- Operating instructions manual (236 pages) ,
- Compact operating instructions (98 pages) ,
- Compact operating instructions (80 pages)
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Description
4.1 SITRANS TH
4.1.7
How TH320 works
The functional principle is described below based on the function chart.
①
②
③
④
Figure 4-5
● Input
● This signal is converted to a digital signal in an analog-to-digital converter (A/D).
● The digital signal is evaluated in a microcontroller (μC1) on the secondary side and
corrected to match the input characteristic.
● The digital signal is transferred via the galvanic isolation
the primary side.
● The analog output value is calculated in the microcontroller (μC2) on the primary side. The
functional status is indicated by LED
● The digital-to-analog converter (D/A) subsequently converts the signal into the output
current
26
SITRANS TH320
A
µC1
D
LED
Extension port
Test terminals
Output
μC2 Microcontroller, on the pri‐
mary side
D/A
Digital-to-analog converter
U
Supply voltage
I
Output current
out
Function chart for SITRANS TH320
⑥
for connecting different signal sources. Section: Input (Page 83).
④
of 4 to 20 mA.
D
µC2
A
5
⑤
Galvanic isolation
⑥
Input
A/D
μC1 Microcontroller, on the secondary side
①
and the communications data is prepared.
SITRANS TH320/TH420/TR320/TR420 (mA/HART)
Operating Instructions, 03/2018, A5E41864807-AA
1
2
3
1 (+)
4 ... 20 mA
U, I
2 (-)
Analog-to-digital converter
⑤
to the microcontroller (μC2) on
4
out
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