Page 26 SITRANS LUT400 (HART) – OPERATING INSTRUCTIONS A5E33329501
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Connecting
Connecting HART
1
2
For more information, consult the mA output parameters (2.5. Current Output) in the
parameter reference section.
1. Depending on the system design, the power supply may be separate from the PLC, or integral to
it.
2. The nominal value for the HART resistor is 250 Ohm. For more information see application guide
Working with HART
, which can be downloaded from the product page of our website. Go to:
www.siemens.com/sitransLUT400
under Support and click on Application Guides.
PLC
1
HART modem
SITRANS LUT400
power supply
Typical PLC/mA configuration with Passive HART connection
R = 250 Ω
2
HART
communicator
Typical PLC/mA configuration with Active HART connection
PLC
1
HART modem
SITRANS LUT400
R = 250 Ω
2
HART
communicator
mA OUT/HART
22 23 24
ACT
PAS
For PASSIVE HART
connection (using
external power
supply), connect
terminals 23 and 24.
mA Output (HART)
For ACTIVE HART
connection (using
LUT400 integral power
supply), connect
terminals 22 and 23.
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