Siemens SITRANS F Operating Instructions Manual page 32

Connecting
5.4 Transmitter power supply, communications and I/O connections
Wiring
①
4 - 20mA output (current source)
②
Relay output
③
Pulse output
Figure 5-5 Typical FST020 Wiring
R
V
c
I
R
L
32
Ω
Ω
Ω
= 250 Ω typical, 750 Ω maximum
= 24 VDC typical / 30 VDC maximum
= 4-20mA
= Loop wire resistance (both ways) plus User's input load resistance.
④
Digital input (Freeze TOT)
⑤
Digital input (CLR TOT)
⑥
Modbus
Isolated 4-20mA Output TB1-1/2
Operating Instructions, 09/2017, A5E41425845-AB
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FST020 IP65 NEMA 4X