Output Signals - Siemens SITRANS FC720 Operating Instructions Manual

FC7x0
Wiring
Fig. 69: Modbus connection

13.4.1.3 Output signals

All circuits for inputs, outputs and power supply are galvanically isolated from each other.
Galvanic isolation
One or two current outputs are available depending on order code position -Z.
Active current
output lout
Depending on the measured value, the active current output delivers 4 – 20 mA.
It may be used for output of the following measured values:
▪ Flow rate (mass, volume, net partial component flow of a mixture)
▪ Density
▪ Temperature
▪ Pressure
▪ Concentration
For HART communication devices, it is supplied on the current output lout1. The current
output may be operated in compliance with the NAMUR NE43 standard.
Nominal output current
Maximum output current range
Load resistance
Load resistance for secure HART communication
SITRANS FC
Fig. 70: Active current output connection lout HART
①
Passive current
output lout
Nominal output current
Maximum output current range
External power supply
Load resistance for secure HART
communication
Load resistance at current output
114 / 180
Balanced Pair
SITRANS FC Slave n
Iout+
Iout-
Receiver
A5E52748387-AA, 2023/09
Master
Pull Up
Common
Pull Down
LT: Line Termination
Value
4 – 20 mA
2.4 – 21.6 mA
≤ 750 Ω
230 – 600 Ω
1
Value
4 – 20 mA
2.4 – 21.6 mA
10.5 – 32 V
DC
230 – 600 Ω
≤ 911 Ω
Transmitter