Siemens SITRANS I100 7NG4124-0AA00 Operating Instruction page 17

Input connections (blue terminals PIN 10,11,12) (blue terminals PIN 10,11,12):
Two-wire- Three-wire-
transmitter transmitter
12 +
10 -
Output connections (black terminals PIN 1,2,3)
Note: A working HART communication requires a minimum load resistance (e.g. input : A working HART communication requires a minimum load resistance (e.g. input
resistance of input card) of 250 Ω in the output circuit. Is this not available the internal 221
Ω resistance can be used. Then the connection has to be done on terminals 3+/2
resistance can be used. Then the connection has to be done on terminals 3+/2-.
The maximum output load is reduced to 479 Ω.
Connecting a HART configuration handheld to the isolating power supply if a low load Connecting a HART configuration handheld to the isolating power
resistance is present (< 220Ohm):
The HART configuration handheld need to be connected at terminal 1 and 2. The HART configuration handheld need to be connected at terminal
Isolating power supply
12 +
11 -
10
0/4...20mA
(black terminals PIN 1,2,3)
in the output circuit. Is this not available the internal 221
221 Ohm
3
2
1
HART
mA-source mA
-
11 -
10 +
+
.
Operating instruction A5E02591611-02 Operating instruction
english
Load resistance
SITRANS I100
17